coal concepts proficiency testing general analysis … · sabs commercial soc ltd uitkomst sabs...
TRANSCRIPT
Page 1 of 22
`
COAL CONCEPTS PROFICIENCY TESTING
GENERAL ANALYSIS SAMPLE
REPORT EIGHTY-THREE
Revision 00
Final report
DATE ISSUED: 30 SEPTEMBER 2018
PARTICIPANT
SCHEME COORDINATOR: K MUNSAMY
SIGNATURE: _____________________
CHECKED BY: R BABOOLAL (SCHEME MANAGER)
Disclaimer: Opinions and interpretations expressed herein are outside the scope of SANAS accreditation *Moisture in the analysis sample is not included in the SANAS schedule of accreditation as robust statistics cannot be applied.
Chlorine, Fluorine, Quick ash, ASTM ash and ASTM Volatiles is not included in the scope of accreditation.
THINKING QUALITY, QUALITY THINKING
REGISTRATION NUMBER: 2006/149731/23 (RMB INDUSTRIAL STATIONERS cc t/a)
81 CERAMIC CURVE, ALTON, RICHARDS BAY 3900 l TEL: +27(0)35 751 2446 l CEL: +27(0)83 6500151 l FAX: 0862605793
E-MAIL: [email protected]
LABORATORY CODE:
Page 2 of 22
EXECUTIVE SUMMARY
1. One hundred and ten samples were sent to participants with 109 timeous result submissions
2. The total number of outliers found were as follows (dry base):
Chlorine x 1
Quick Ash x 1
ISO Ash x 2
ISO Volatile Matter x 5
Sulphur x 5
Phosphorous x 2
AFT Softening x 4
AFT Hemisphere x 2
AFT Flow x 2
3. Nitrogen, Chlorine, Fluorine, ASTM Ash & ASTM Volatile Matter participants were insufficient to warrant robust statistical calculations. The average result was used as the assigned value.
4. Trending for your laboratory is as follows:
Page 3 of 22
TABLE OF CONTENTS
ITEM
PAGE NUMBER
Letter to participant
4
List of participants
5
Type of sample used
6
Preparation of sample
6
Homogeneity check
6
Stability check
7
ISO Ash data
8
ISO Ash z-score trend
9
Quick Ash data & trend 10
ISO Volatile matter data
11
ISO Volatile matter z-score trend
12
Calorific value data
13
Calorific value z-score trend
14
Total sulphur data
15
Total sulphur z-score trend
16
Phosphorous data and Z-Score trend
17
Carbon data / Hydrogen data / Nitrogen data
18
AFT data and z-scores
19
ASTM Ash and ASTM Volatile matter, Chlorine & Fluorine 20
Conclusion
21
Terms & Conditions 22
Page 4 of 22
Dear Participant
RE: PROFICIENCY TESTING RESULTS FOR THE MONTH OF SEPTEMBER 2018
Thank you for your participation in the Coal Concepts proficiency testing scheme.
Your laboratory code is
All results are totally confidential. Any results in Bold, Italics and Underlined are outliers. Where applicable, the most
extreme outliers have been eliminated from calculations using the Grubbs estimate for outliers. Robust statistics has been
applied where possible. Analysis results have been reported on air dry and dry base. The dry base results have been used
to calculate the z-scores.
Please take note of the following:
1. Z-scores between -1 and +1 is deemed acceptable
2. Z-scores between -2 and -3 should serve as a warning that the analysis result could get worse
3. Z-scores between +2 and +3 should also serve as a warning that analysis results could get worse.
4. Z- scores lower than -3 and exceeding +3 should warrant an investigation
5. Compare your result to the robust average which will be the assigned value. The measurement of uncertainty (UoM) of
the results is also stated.
6. All calculations can be made available upon request
The Coal Concepts scheme adheres to the requirements of ISO/IEC 17043:2010 – Conformity assessment – General
requirements for proficiency testing.
Statistical analysis has been carried out using ISO/IEC 13528:2015-Statistical methods for use in proficiency testing by
interlaboratory comparisons
Please find results attached together with Z-score trends.
Best Regards
R Baboolal
Page 5 of 22
LIST OF PARTICIPANTS IN ALPHABETICAL ORDER
Arcelor Mittal - Vanderbijl Park Arcelor Mittal - Newcastle
Anglo SOC - Goedehoop Colliery South Plant Anglo SOC - Goedehoop Colliery North Plant
Anglo SOC - Kleinkopje Colliery Anglo SOC - Greenside Colliery
Anglo SOC - Landau Colliery Alfred H Knight -Richards Bay Laboratory
ALS - Phalandwa ALS - Witlab
Afrisam - Dudfield Afrisam - Ulco
AquaSpecto Bureau Veritas - Nacala
Bureau Veritas Inspectorate Laboratories - Tendele Bureau Veritas Inspectorate Laboratories - Beira
Bureau Veritas Inspectorate Laboratories - Alton Bureau Veritas Testing & Inspection SA - Pretoria
Bureau Veritas Inspectorate Laboratories - Middelburg Castle Peak Power Station – Hong Kong
Bureau Veritas – Moatize, Vale CoalLab Pty Ltd - Uitgevallen
CoalLab Pty Ltd - Lurco CoalLab Pty Ltd - Phola
CoalLab Pty Ltd – Tselentis CoalLab Pty Ltd - Kangala
CoalLab Pty Ltd - Middelburg CoalLab Pty Ltd - Umlabu
CoalLab Pty Ltd - Droogvallei CoalLab Pty Ltd - VDD
CoalLab Pty Ltd - AMR Delmas Coal
Eyethu Coal Exxaro Resources - Grootegeluk Mine
Eskom Holdings SOC Ltd – Kendal Power station Eskom Holdings SOC Ltd - Duvha Power Station
Eskom Holdings SOC Ltd – Lethabo Power Station Eskom Holdings SOC Ltd - Komati Power Station
Eskom Holdings SOC Ltd - Tutuka Power Station Eskom Holdings SOC Ltd - Grootvlei Power Station
Eskom Holdings SOC Ltd - ERID Eskom Holdings SOC Ltd - Kriel Power Station
Eskom Holdings SOC Ltd - Hendrina Power Station Eskom Holdings SOC Ltd - Matimba Power Station
Eskom Holdings SOC Ltd - Arnot Power Station Exxaro Resources - Matla Mine
Eskom Holdings SOC Ltd - Matla Power Station Eskom Holdings SOC Ltd – Medupi Power Station
Eskom Holdings SOC Ltd – Majuba Power Station G&W Base & Industrial Minerals
Glencore Wonderkop Glencore -Rustenburg Smelter
Glencore Boshoek Smelter Glencore -Lydenburg Smelter
Glencore Lion Smelter GLI Laboratuvar Sube Mudurlugu Komur Deney Laboratuvari - Turkey
HighVeld Laboratories Idwala Lime
Intertek Mozambique Jindal Mining SA (Pty) Ltd - Kiepersol Colliery
Kangra Coal (Pty) Ltd Lafarge Industries SA (Pty) Ltd - Lichtenburg
Morupule Coal Mine - Botswana Mafube Colliery Mine pty (ltd)
Martech Marine surveyors - India Makomo Resources
Msobo Coal Pty Ltd Mitra SK South Africa (Pty) Ltd
M L Coal Noko Analytical Services CC - Welgemeend
Mpumamanzi Noko Analytical Services CC - Twistdraai
Noko Analytical Services CC - Witbank Noko Analytical Services CC - Hakahno
Richards Bay Minerals Ronewa Lab
Seriti - Kriel Colliery Seriti - New Vaal Colliery
Siza Coal Services - Dundee Siza Coal Services - Vlakfontein
Siza Coal Services - Botswana Siza Coal Services - Kinross
Siza Coal Services - Middelburg Siza Coal Services - NCC
Siza Coal Services - Carolina Siza Coal Services - Eastside
Siza Coal Services - Wildfontein Siza Coal Services - Mooiplaats
South 32 – Khutala Colliery SABS Commercial SOC Ltd Springlake
Sibonisiwe Coal Laboratory Services CC – Rirhandzu Lab Sibonisiwe Coal Laboratory Services CC - West Coal Processing
Sibonisiwe Coal Laboratory Services CC Sibonisiwe Coal Laboratory Services CC – Mzimkhulu
Sibonisiwe Coal Laboratory Services CC – Elandsfontein Sibonisiwe Coal Laboratory Services CC - Vaalbult
SGS South Africa (Pty) Ltd – Richards Bay Coal Terminal Laboratory SGS South Africa (Pty) Ltd - Leeuwpan Laboratory
SGS South Africa (Pty) Ltd - Trichardt Laboratory SGS South Africa (Pty) Ltd – Richards Bay Port Laboratory
SGS South Africa (Pty) Ltd – GGV Laboratory SGS South Africa (Pty) Ltd - Middelburg Laboratory
SGS South Africa (Pty) Ltd - Impunzi Laboratory SGS South Africa (Pty) Ltd - Wondefontein Laboratory
SABS Commercial SOC Ltd Sudor SGS Tweefontein
SABS Commercial SOC Ltd CSIR SGS South Africa (Pty) Ltd - Chilwavuhusiku Laboratory
SABS Commercial SOC Ltd Uitkomst SABS Commercial SOC Ltd Secunda
SPTE Lab - Middelburg SABS Commercial SOC Ltd Richards bay
Tata Steel – Wales Lab, Europe
UIS Analytical Services Umzamo Analytical Services - Londani
Umzamo Analytical Services - Overlooked Colliery Umzamo Analytical Services - Witbank
Umzamo Analytical Services - Doornrug Vitrovian Analytical Services DELMAS
Vitrovian Analytical Services Koornfontein Vitrovian Analytical Services Umlalazi
Zululand Anthracite Colliery Vinca Institute for Nuclear Sciences - Serbia
Page 6 of 22
1. TYPE OF SAMPLE USED
The coal used in this proficiency testing round was bituminous coal from Mpumalanga.
2. PREPARATION OF SAMPLE
Approximately 800kg’s of sample with an approximate topsize of 50mm was sourced. This was crushed to -4mm
using a jaw crusher. The -4mm material was reduced to -212um using a cross beat pulveriser. The 212 material
was sieved using a 212um screen. Any +212um material was pulverised and sieved until all material passed
through the 212 um sieve.
All the -212um material was then mixed in a mixing drum for 4 hours.
3. HOMOGENEITY CHECK
There were 109 participants in this round, 20 portions of sample were randomly extracted from the 800kg
sample. These were packaged in their final form i.e. in 200ml sample bottles. The bottles were labelled 1 to 20.
The results were as follows:
SAMPLE NO.
TEST PORTION 1
TEST PORTION
2 sample av (Xt)
range (Wt)
range sqd
1 14,44 14,25 14,35 0,19 0,0361
2 14,50 14,4 14,45 0,10 0,0100
3 14,41 14,35 14,38 0,06 0,0036
4 14,52 14,42 14,47 0,10 0,0100
5 14,37 14,17 14,27 0,20 0,0400
6 14,58 14,27 14,43 0,31 0,0961
7 14,41 14,47 14,44 0,06 0,0036
8 14,41 14,31 14,36 0,10 0,0100
9 14,47 14,34 14,41 0,13 0,0169
10 14,43 14,37 14,40 0,06 0,0036
11 14,46 14,31 14,39 0,15 0,0225
12 14,35 14,41 14,38 0,06 0,0036
13 14,33 14,31 14,32 0,02 0,0004
14 14,36 14,43 14,40 0,07 0,0049
15 14,35 14,43 14,39 0,08 0,0064
16 14,50 14,22 14,36 0,28 0,0784
17 14,28 14,45 14,37 0,17 0,0289
18 14,45 14,45 14,45 0,00 0,0000
19 14,44 14,31 14,38 0,13 0,0169
20 14,24 14,27 14,26 0,03 0,001
GENERAL AVERAGE 14,38 STANDARD DEVIATION 0,055 WITHIN SAMPLE STANDARD DEVIATION 0,099 BETWEEN SAMPLE STANDARD DEVIATION 0,043
The between sample standard deviation must be ≤ 0.3 x ơ
(ơ = std deviation for the proficiency assessment)
Ơ = 2% of the mean was used, which is the repeatability for ISO ash (Ash % > 10%)
Hence 0.3 x 0.288 = 0.086
Since 0.043 < 0.086 the samples are homogenous
Page 7 of 22
4. STABILITY CHECK Samples were retained for sales as reference material. Twenty of them were randomly chosen for stability
testing. In order for the proficiency testing samples to be declared stable the general average from the homogeneity
check and that of the stability check the difference in the general average should not differ by more than 0.3 X
precision
This test has been carried out about a month after the samples were received by the participating laboratories
SAMPLE NO.
TEST PORTION 1
TEST PORTION
2 sample av (Xt)
range (Wt)
range sqd
1 14,33 14,42 14,38 0,09 0,0081
2 14,30 14,37 14,34 0,07 0,0049
3 14,36 14,46 14,41 0,10 0,0100
4 14,42 14,38 14,40 0,04 0,0016
5 14,38 14,33 14,36 0,05 0,0025
6 14,49 14,53 14,51 0,04 0,0016
7 14,32 14,42 14,37 0,10 0,0100
8 14,32 14,47 14,40 0,15 0,0225
9 14,44 14,19 14,32 0,25 0,0625
10 14,48 14,27 14,38 0,21 0,0441
11 14,47 14,34 14,41 0,13 0,0169
12 14,50 14,40 14,45 0,10 0,0100
13 14,31 14,46 14,39 0,15 0,0225
14 14,38 14,40 14,39 0,02 0,0004
15 14,47 14,33 14,40 0,14 0,0196
16 14,49 14,25 14,37 0,24 0,0576
17 14,51 14,46 14,49 0,05 0,0025
18 14,05 14,44 14,25 0,39 0,1521
19 14,41 14,40 14,41 0,01 0,0001
20 14,33 14,29 14,31 0,04 0,002
GENERAL AVERAGE 14,38 STANDARD DEVIATION 0,059 WITHIN SAMPLE STANDARD DEVIATION 0,106 BETWEEN SAMPLE STANDARD DEVIATION 0,047
(Ơ = 0.253 was used)
For this report 0.3 x 0.288 = 0.086
Absolute value of (14.38 – 14.38) = 0.00
Since 0.0 < 0.086 the proficiency testing samples were stable
Page 8 of 22
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : ISO ASH (%)
LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%) Z-SCORE (DRY BASE)
1a 3,06 14,32 14,77 0,60
6a 1,99 14,36 14,65 -0,27
7a 2,88 14,34 14,77 0,55
9a 1,88 14,30 14,57 -0,83
10a 2,40 14,20 14,55 -1,01
12a 2,70 14,30 14,70 0,06
15a 2,54 14,74 15,12 3,15
18a 2,76 14,36 14,77 0,57
20a 2,72 14,18 14,58 -0,81
21a 2,23 14,30 14,63 -0,45
23a 2,38 14,42 14,77 0,60
24a 2,50 14,34 14,71 0,14
26a 1,64 14,51 14,75 0,46
27a 2,50 14,30 14,67 -0,16
28a 2,25 14,50 14,83 1,05
30a 1,67 14,37 14,61 -0,54
32a 2,00 14,30 14,59 -0,70
33a 2,10 14,20 14,50 -1,33
35a 2,47 14,31 14,67 -0,12
36a 2,20 14,40 14,72 0,25
38a 2,55 14,02 14,39 -2,19
40a 2,47 14,46 14,83 0,99
42a 2,06 14,60 14,91 1,58
44a 2,83 14,33 14,75 0,42
49a 1,76 14,54 14,80 0,81
58a 1,96 14,34 14,63 -0,45
59a 2,24 14,33 14,66 -0,22
60a 2,38 14,37 14,72 0,23
61a 2,10 14,20 14,50 -1,33
65a 2,90 14,00 14,42 -1,96
66a 1,98 14,50 14,79 0,75
67a 2,60 14,40 14,78 0,69
69a 2,58 14,28 14,66 -0,22
72a 2,55 14,04 14,41 -2,04
76a 1,93 14,50 14,79 0,70
78a 1,89 14,24 14,51 -1,26
79a 2,87 14,29 14,71 0,17
80a 2,07 14,35 14,65 -0,26
82a 2,50 14,30 14,67 -0,16
88a 2,75 14,38 14,79 0,71
92a 2,83 14,17 14,58 -0,77
95a 2,40 14,23 14,58 -0,79
96a 1,67 14,75 15,00 2,26
97a 1,67 14,55 14,80 0,78
98a 2,30 14,48 14,82 0,96
99a 2,30 14,40 14,74 0,36
100a 1,61 14,28 14,51 -1,27
101a 2,62 14,40 14,79 0,71
105a 1,80 14,50 14,77 0,56
106a 2,88 14,36 14,79 0,70
107a 2,63 14,36 14,75 0,43
108a 2,70 14,33 14,73 0,28
109a 2,80 14,40 14,81 0,91
110a 1,87 14,37 14,64 -0,33
112a 2,10 14,40 14,71 0,14
117a 2,28 14,38 14,72 0,19
124a 1,95 14,42 14,71 0,13
126a 2,30 14,29 14,63 -0,45
131a 2,32 14,27 14,61 -0,58
132a 2,27 14,31 14,64 -0,34
135a 2,27 12,88 13,18 -10,93
136a 2,28 14,25 14,58 -0,77
137a 2,27 14,29 14,62 -0,49
139a 2,80 14,25 14,66 -0,21
143a 1,75 14,30 14,55 -0,97
145a 2,37 14,30 14,65 -0,30
151a 2,03 14,46 14,76 0,51
165a 1,68 14,46 14,71 0,13
167a 2,06 14,58 14,89 1,43
168a 3,51 14,53 15,06 2,68
169a 1,70 14,43 14,68 -0,07
170a 2,40 14,30 14,65 -0,27
171a 2,68 14,06 14,45 -1,75
175a 1,53 14,49 14,72 0,19
177a 1,47 16,45 16,70 14,53
180a 2,23 14,07 14,39 -2,16
Number of results - 76 76 76 -
OUTLIERS - - 2 2 -
AVERAGE - 2,31 14,35 14,69 -
STD DEVIATION - - 0,14 0,14 -
MEDIAN 14,34 14,70
ROBUST AVERAGE - - 14,35 14,69 -
ROBUST STD DEVIATION - - 0,15 0,15 -
UoM 0,01 0,02
Page 9 of 22
-3,00
-2,00
-1,00
0,00
1,00
2,00
3,00
Z-SC
OR
E
LABORATORY ID
ISO ASH Z-SCORE TREND
Page 10 of 22 COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : QUICK ASH (%)
LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%)
Z-SCORE (DRY BASE)
8a 2,55 14,13 14,50 -0,86
21a 2,23 14,18 14,50 -0,83
22a 1,74 14,19 14,44 -1,23
23a 2,38 14,30 14,65 0,08
24a 2,50 14,28 14,65 0,07
35a 2,47 14,17 14,53 -0,67
36a 2,20 14,50 14,83 1,21
37a 2,33 14,35 14,69 0,36
39a 2,18 14,65 14,98 2,16
40a 2,47 14,32 14,68 0,30
41a 1,90 14,40 14,68 0,28
49a 1,76 14,49 14,75 0,72
50a 2,28 14,75 15,09 2,91
63a 2,80 14,33 14,74 0,68
71a 2,20 14,47 14,80 1,01
73a 1,62 14,29 14,53 -0,70
77a 2,90 14,20 14,62 -0,07
84a 2,30 14,38 14,72 0,53
92a 2,83 14,13 14,54 -0,59
94a 2,85 14,28 14,70 0,40
100a 1,61 14,25 14,48 -0,96
101a 2,62 14,43 14,82 1,16
102a 2,43 14,10 14,45 -1,17
105a 1,80 14,50 14,77 0,83
113a 2,40 14,46 14,82 1,14
119a 2,45 14,25 14,61 -0,17
122a 2,50 14,10 14,46 -1,10
126a 2,30 14,15 14,48 -0,96
129a 2,55 14,35 14,73 0,57
130a 2,30 14,10 14,43 -1,29
131a 2,32 14,26 14,60 -0,23
132a 2,27 14,33 14,66 0,17
133a 2,20 14,40 14,72 0,56
134a 2,55 14,25 14,62 -0,08
136a 2,28 14,35 14,68 0,31
137a 2,27 14,25 14,58 -0,34
138a 2,69 14,31 14,71 0,45
140a 2,61 14,23 14,61 -0,15
143a 1,75 14,31 14,56 -0,45
147a 1,51 14,45 14,67 0,23
149a 2,80 14,40 14,81 1,14
153a 2,30 14,20 14,53 -0,64
160a 2,30 14,30 14,64 0,0
161a 1,70 14,50 14,75 0,73
163a 2,70 14,20 14,59 -0,26
164a 2,30 14,50 14,84 1,30
165a 1,68 14,10 14,34 -1,86
168a 3,51 12,63 13,09 -9,79
169a 1,70 14,03 14,27 -2,30
175a 1,53 14,26 14,48 -0,97
176a 2,80 14,20 14,61 -0,17
181a 2,30 14,20 14,53 -0,64
182a 2,30 14,00 14,33 -1,93
183a 2,30 14,50 14,84 1,30
Number of results - 54 54 54 -
OUTLIERS - - 1 1 -
AVERAGE - 2,30 14,30 14,64 -
STD DEVIATION - - 0,15 0,16 -
MEDIAN 14,29 14,64
ROBUST AVERAGE - - 14,30 14,63 -
ROBUST STD DEVIATION - - 0,16 0,16 -
UoM 0,03 0,03
-3,00
-2,00
-1,00
0,00
1,00
2,00
3,00
Z-SC
OR
E
LABORATORY ID
QUICK ASH Z-SCORE TREND
Page 11 of 22
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : ISO VOLATILE MATTER (%)
LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE)
1a 3,06 22,92 23,64 -0,36
6a 1,99 23,57 24,05 0,34
7a 2,88 20,54 21,15 -4,65
8a 2,55 24,05 24,68 1,43
9a 1,88 24,93 25,40 2,67
10a 2,40 23,50 24,08 0,39
12a 2,70 23,00 23,64 -0,37
15a 2,54 22,84 23,44 -0,71
18a 2,76 23,07 23,72 -0,22
20a 2,72 22,77 23,41 -0,76
21a 2,23 23,21 23,74 -0,19
22a 1,74 23,25 23,66 -0,32
23a 2,38 23,23 23,80 -0,09
24a 2,50 23,06 23,65 -0,34
26a 1,64 23,76 24,15 0,52
27a 2,50 23,20 23,79 -0,10
28a 2,25 23,20 23,73 -0,20
30a 1,67 23,05 23,44 -0,70
32a 2,00 23,00 23,47 -0,66
33a 2,10 23,00 23,49 -0,61
35a 2,47 23,59 24,19 0,58
36a 2,20 22,90 23,42 -0,75
37a 2,33 21,08 21,58 -3,90
38a 2,55 23,85 24,47 1,07
39a 2,18 23,65 24,18 0,56
40a 2,47 23,18 23,77 -0,14
41a 1,90 23,30 23,75 -0,17
42a 2,06 23,39 23,88 0,05
44a 2,83 23,43 24,11 0,45
49a 1,76 23,05 23,46 -0,67
50a 2,28 23,35 23,89 0,08
58a 1,96 23,51 23,98 0,22
59a 2,24 23,68 24,22 0,64
60a 2,38 23,00 23,56 -0,50
61a 2,10 23,20 23,70 -0,26
63a 2,80 23,40 24,07 0,39
65a 2,90 22,70 23,38 -0,81
66a 1,98 24,99 25,49 2,83
67a 2,60 23,30 23,92 0,12
69a 2,58 22,88 23,49 -0,63
71a 2,20 23,40 23,93 0,13
72a 2,55 22,98 23,58 -0,46
73a 1,62 24,54 24,94 1,88
76a 1,93 22,50 22,94 -1,56
77a 2,90 24,10 24,82 1,67
78a 1,89 22,70 23,14 -1,23
79a 2,87 22,70 23,37 -0,83
80a 2,07 23,07 23,56 -0,50
82a 2,50 22,48 23,06 -1,37
83a 2,02 23,49 23,97 0,21
88a 2,75 23,30 23,96 0,19
92a 2,83 22,99 23,66 -0,33
94a 2,85 22,65 23,31 -0,92
95a 2,40 23,30 23,87 0,04
96a 1,67 23,53 23,93 0,14
97a 1,67 23,44 23,84 -0,02
98a 2,30 21,41 21,91 -3,33
99a 2,30 23,40 23,95 0,17
100a 1,61 21,29 21,64 -3,81
101a 2,62 22,96 23,58 -0,47
102a 2,43 22,70 23,27 -1,01
105a 1,80 23,60 24,03 0,31
106a 2,88 22,96 23,64 -0,36
108a 2,70 22,40 23,02 -1,43
109a 2,80 22,40 23,05 -1,39
110a 1,87 23,52 23,97 0,20
112a 2,10 24,20 24,72 1,50
113a 2,40 24,13 24,72 1,50
117a 2,28 22,95 23,49 -0,63
119a 2,45 23,50 24,09 0,41
122a 2,50 22,70 23,28 -0,98
124a 1,95 23,31 23,77 -0,13
126a 2,30 22,97 23,51 -0,58
129a 2,55 22,90 23,50 -0,60
130a 2,30 23,50 24,05 0,35
131a 2,32 23,10 23,65 -0,35
132a 2,27 23,25 23,79 -0,10
133a 2,20 24,10 24,64 1,36
134a 2,55 24,13 24,76 1,56
135a 2,27 26,24 26,85 5,16
136a 2,28 23,17 23,71 -0,24
137a 2,27 23,45 23,99 0,25
138a 2,69 23,94 24,60 1,29
140a 2,61 23,52 24,15 0,52
139a 2,80 22,87 23,53 -0,55
143a 1,75 23,66 24,08 0,40
145a 2,37 23,40 23,97 0,20
147a 1,51 23,77 24,13 0,49
151a 2,03 23,23 23,71 -0,24
161a 1,70 23,50 23,91 0,10
165a 1,68 24,50 24,92 1,84
167a 2,06 23,20 23,69 -0,28
168a 3,51 21,38 22,16 -2,91
169a 1,70 23,60 24,01 0,27
170a 2,40 23,40 23,98 0,22
175a 1,53 25,10 25,49 2,82
180a 2,23 17,60 18,00 -10,07
NUMBER OF RESULTS - 97 97 97 -
OUTLIERS - - 3 5 -
AVERAGE - 2,30 23,26 23,85 -
STD DEVIATION - 0,67 0,58 -
MEDIAN 23,25 23,79
ROBUST AVERAGE - - 23,26 23,85 -
ROBUST STD DEVIATION - - 0,71 0,61 -
UoM - - 0,09 0,08 -
Page 12 of 22
-3,00
-2,00
-1,00
0,00
1,00
2,00
3,00
98a
168a
76a
108a
109a
82a
78a
102a
122a
94a
79a
65a
20a
36a
15a
30a
49a
32a
117a
69a
33a
129a
126a
139a
80a
60a
101a
72a
12a
106a
1a 131a
24a
92a
22a
167a
61a
136a
151a
18a
28a
21a
41a
40a
124a
132a
27a
23a
97a
95a
42a
50a
161a
67a
71a
96a
99a
88a
145a
110a
83a
170a
58a
137a
169a
105a
6a 130a
63a
10a
143a
119a
44a
147a
140a
26a
39a
35a
59a
38a
138a
133a
8a 112a
113a
134a
77a
165a
73a
9a 175a
66a
Z-SC
OR
E
LABORATORY ID
VOLATILE MATTER Z-SCORE TREND
Page 13 of 22 COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : CALORIFIC VALUE (MJ/kg)
LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (MJ/kg) DRY BASE (MJ/kg) Z-SCORE (DRY BASE)
1a 3,06 27,52 28,39 0,31
6a 1,99 27,68 28,24 -0,26
8a 2,55 27,21 27,92 -1,50
9a 1,88 28,13 28,66 1,39
10a 2,40 27,62 28,30 -0,03
12a 2,70 27,47 28,23 -0,29
18a 2,76 27,56 28,34 0,13
20a 2,72 27,87 28,65 1,33
21a 2,23 27,72 28,35 0,17
23a 2,38 27,54 28,21 -0,38
27a 2,50 27,22 27,92 -1,52
28a 2,25 27,70 28,34 0,12
30a 1,67 28,10 28,58 1,05
32a 2,00 27,80 28,37 0,23
33a 2,10 27,85 28,45 0,54
35a 2,47 27,68 28,38 0,28
36a 2,20 27,68 28,30 -0,02
37a 2,33 27,52 28,18 -0,51
38a 2,55 27,28 27,99 -1,22
39a 2,18 27,72 28,34 0,12
40a 2,47 27,75 28,45 0,56
42a 2,06 27,71 28,29 -0,06
44a 2,83 27,43 28,23 -0,31
49a 1,76 27,78 28,28 -0,12
50a 2,28 27,02 27,65 -2,56
58a 1,96 27,61 28,16 -0,57
59a 2,24 27,52 28,15 -0,61
61a 2,10 27,81 28,41 0,38
63a 2,80 27,22 28,00 -1,18
65a 2,90 27,53 28,35 0,17
66a 1,98 27,72 28,28 -0,11
67a 2,60 27,62 28,36 0,19
71a 2,20 27,38 28,00 -1,22
72a 2,55 27,23 27,94 -1,42
73a 1,62 27,68 28,14 -0,67
76a 1,93 27,78 28,33 0,07
77a 2,90 27,69 28,52 0,81
79a 2,87 27,01 27,81 -1,95
80a 2,07 27,45 28,03 -1,08
82a 2,50 27,84 28,55 0,94
83a 2,02 27,91 28,49 0,69
84a 2,30 27,44 28,09 -0,86
88a 2,75 27,68 28,46 0,60
92a 2,83 27,39 28,19 -0,47
94a 2,85 27,48 28,29 -0,09
95a 2,40 27,60 28,28 -0,11
96a 1,67 27,73 28,20 -0,42
97a 1,67 27,73 28,20 -0,42
98a 2,30 27,23 27,87 -1,70
99a 2,30 27,62 28,27 -0,15
100a 1,61 28,10 28,56 0,98
101a 2,62 27,55 28,29 -0,07
102a 2,43 28,18 28,88 2,23
105a 1,80 27,76 28,27 -0,15
106a 2,88 27,51 28,33 0,08
108a 2,70 26,86 27,61 -2,74
109a 2,80 27,59 28,38 0,30
110a 1,87 27,93 28,46 0,60
112a 2,10 27,36 27,95 -1,41
117a 2,28 28,09 28,75 1,70
119a 2,45 27,77 28,47 0,62
122a 2,50 28,12 28,84 2,08
124a 1,95 27,95 28,51 0,77
126a 2,30 27,57 28,22 -0,35
129a 2,55 27,35 28,07 -0,94
130a 2,30 27,52 28,17 -0,55
131a 2,32 27,90 28,56 0,99
132a 2,27 27,11 27,74 -2,21
133a 2,20 27,56 28,18 -0,50
134a 2,55 27,67 28,39 0,32
135a 2,27 27,76 28,40 0,38
136a 2,28 27,75 28,40 0,35
137a 2,27 28,33 28,99 2,65
140a 2,61 27,80 28,55 0,92
143a 1,75 27,74 28,23 -0,29
145a 2,37 27,73 28,40 0,37
147a 1,51 27,59 28,01 -1,15
149a 2,80 27,87 28,67 1,42
153a 2,30 27,79 28,44 0,53
160a 2,30 27,97 28,63 1,25
161a 1,70 28,10 28,59 1,08
163a 2,70 27,58 28,35 0,15
164a 2,30 28,08 28,74 1,69
165a 1,68 27,81 28,29 -0,09
167a 2,06 27,87 28,46 0,58
168a 3,51 27,83 28,84 2,08
169a 1,70 27,61 28,09 -0,86
170a 2,40 27,59 28,27 -0,15
171a 2,68 27,70 28,46 0,60
172a 1,87 27,91 28,44 0,52
175a 1,53 28,00 28,44 0,49
176a 2,80 27,55 28,34 0,14
177a 1,47 27,68 28,09 -0,84
180a 2,23 27,57 28,20 -0,43
181a 2,30 27,33 27,97 -1,30
182a 2,30 27,62 28,27 -0,15
NUMBER OF RESULTS - 96 96 96 -
OUTLIERS - - 0 0 -
AVERAGE - 2,32 27,66 28,31 -
STD DEVIATION - - 0,27 0,26 -
MEDIAN 27,68 28,31
ROBUST AVERAGE - - 27,66 28,31 -
ROBUST STD DEVIATION - - 0,29 0,28 -
UoM - - 0,04 0,04 -
Page 14 of 22
-3,00
-2,00
-1,00
0,00
1,00
2,00
3,00
108a
50a
132a
79a
98a
27a
8a 72a
112a
181a
38a
71a
63a
147a
80a
129a
84a
169a
177a
73a
59a
58a
130a
37a
133a
92a
180a
96a
97a
23a
126a
44a
12a
143a
6a 170a
105a
99a
182a
49a
95a
66a
165a
94a
101a
42a
10a
36a
76a
106a
28a
39a
18a
176a
163a
65a
21a
67a
32a
35a
109a
1a 134a
136a
145a
135a
61a
175a
172a
153a
33a
40a
167a
110a
88a
171a
119a
83a
124a
77a
140a
82a
100a
131a
30a
161a
160a
20a
9a 149a
164a
117a
122a
168a
102a
137aZ-
SCO
RE
LABORATORY ID
CALORIFIC VALUE Z-SCORE TREND
Page 15 of 22
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : TOTAL SULPHUR (%)
LAB ID MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE Z-SCORE (DRY BASE)
1a 3,06 0,52 0,54 -0,33
6a 1,99 0,55 0,56 0,16
7a 2,88 0,41 0,42 -2,57
9a 1,88 0,67 0,68 2,54
10a 2,40 0,51 0,52 -0,60
12a 2,70 0,50 0,51 -0,77
15a 2,54 0,45 0,46 -1,79
18a 2,76 0,49 0,50 -0,97
21a 2,23 0,65 0,66 2,19
23a 2,38 0,51 0,52 -0,60
24a 2,50 0,54 0,55 0,0
26a 1,64 0,56 0,57 0,32
27a 2,50 0,52 0,53 -0,39
28a 2,25 0,54 0,55 0,0
30a 1,67 0,52 0,53 -0,48
32a 2,00 0,54 0,55 0,0
35a 2,47 0,55 0,56 0,21
36a 2,20 0,56 0,57 0,38
38a 2,55 0,51 0,52 -0,58
39a 2,18 0,54 0,55 0,0
40a 2,47 0,50 0,51 -0,79
42a 2,06 0,54 0,55 0,0
44a 2,83 0,58 0,60 0,86
49a 1,76 0,54 0,55 0,0
50a 2,28 0,64 0,65 2,00
58a 1,96 0,53 0,54 -0,25
60a 2,38 0,51 0,52 -0,60
61a 2,10 0,52 0,53 -0,43
66a 1,98 0,53 0,54 -0,24
69a 2,58 0,51 0,52 -0,58
71a 2,20 0,53 0,54 -0,22
72a 2,55 0,56 0,57 0,42
76a 1,93 0,55 0,56 0,15
78a 1,89 0,49 0,50 -1,05
79a 2,87 0,34 0,35 -3,98
80a 2,07 0,52 0,53 -0,43
83a 2,02 0,55 0,56 0,16
88a 2,75 0,46 0,47 -1,57
92a 2,83 0,66 0,68 2,47
95a 2,40 0,50 0,51 -0,80
97a 1,67 0,53 0,54 -0,28
99a 2,30 0,55 0,56 0,19
101a 2,62 0,58 0,60 0,83
106a 2,88 0,55 0,57 0,26
107a 2,63 0,58 0,60 0,83
108a 2,70 0,54 0,55 0,0
109a 2,80 0,55 0,57 0,25
110a 1,87 0,52 0,53 -0,46
112a 2,10 0,52 0,53 -0,43
113a 2,40 0,51 0,52 -0,60
119a 2,45 0,52 0,53 -0,39
122a 2,50 0,58 0,59 0,82
126a 2,30 0,63 0,64 1,80
130a 2,30 0,46 0,47 -1,61
131a 2,32 0,63 0,64 1,80
132a 2,27 0,46 0,47 -1,62
133a 2,20 0,53 0,54 -0,22
134a 2,55 0,51 0,52 -0,58
135a 2,27 1,22 1,25 13,64
136a 2,28 0,57 0,58 0,59
137a 2,27 0,65 0,67 2,20
138a 2,69 0,52 0,53 -0,37
139a 2,80 0,52 0,53 -0,42
140a 2,61 0,67 0,69 2,64
143a 1,75 0,55 0,56 0,13
145a 2,37 0,54 0,55 0,00
161a 1,70 0,55 0,56 0,13
165a 1,68 0,80 0,81 5,11
167a 2,06 0,53 0,54 -0,23
168a 3,51 0,52 0,54 -0,28
169a 1,70 0,53 0,54 -0,27
172a 1,87 0,96 0,98 8,34
175a 1,53 0,53 0,54 -0,29
177a 1,47 0,56 0,57 0,30
180a 2,23 0,76 0,78 4,40
183a 2,30 0,52 0,53 -0,41
NUMBER OF RESULTS 76 76 76 -
OUTLIERS - - 5 5 -
AVERAGE - 2,33 0,54 0,55 -
MEDIAN - 0,53 0,54
STD DEVIATION - - 0,05 0,05 -
ROBUST AVERAGE - - 0,54 0,55 -
ROBUST STD DEVIATION - - 0,05 0,05 -
UoM - - 0,01 0,01
Page 16 of 22
-3,00
-2,00
-1,00
0,00
1,00
2,00
3,00
79a
7a 15a
132a
130a
88a
78a
18a
95a
40a
12a
23a
60a
10a
113a
38a
134a
69a
30a
110a
80a
61a
112a
139a
183a
119a
27a
138a
1a 175a
168a
97a
169a
58a
66a
167a
71a
133a
32a
42a
39a
28a
145a
49a
24a
108a
161a
143a
76a
6a 83a
99a
35a
109a
106a
177a
26a
36a
72a
136a
122a
101a
107a
44a
126a
131a
50a
21a
137a
92a
9a 140a
180a
165a
172a
135aZ-
SCO
RE
LABORATORY ID
TOTAL SULPHUR Z-SCORE TREND
Page 17 of 22 COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : PHOSPHOROUS IN COAL (%)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE
Z-SCORE (DRY BASE)
1a 3,06 0,102 0,105 0,18
7a 2,88 0,131 0,135 1,85
9a 1,88 0,083 0,084 -1,00
12a 2,70 0,124 0,127 1,43
15a 2,54 0,082 0,084 -1,00
18a 2,76 0,101 0,104 0,11
21a 2,23 0,086 0,088 -0,79
23a 2,38 0,082 0,084 -1,01
24a 2,50 0,120 0,123 1,19
26a 1,64 0,095 0,096 -0,33
67a 2,60 0,101 0,104 0,10
69a 2,58 0,082 0,084 -1,00
78a 1,89 0,070 0,071 -1,72
108a 2,70 0,109 0,112 0,57
109a 2,80 0,110 0,113 0,63
113a 2,40 0,100 0,102 0,0
112a 2,10 0,101 0,103 0,07
114a 2,63 0,093 0,096 -0,36
138a 2,69 0,108 0,111 0,51
139a 2,80 0,079 0,081 -1,16
169a 1,70 0,165 0,168 3,70
172a 1,87 0,130 0,132 1,71
177a 1,47 0,671 0,681 32,49
Number of results - 23 23 23 -
OUTLIERS - - 2 2 -
AVERAGE - 2,42 0,099 0,102 -
STD DEVIATION - - 0,017 0,018 -
MEDIAN - 0,101 0,103
ROBUST AVERAGE - - 0,099 0,102
ROBUST STD DEVIATION - - 0,019 0,020
UoM - - 0,005 0,005
-3,00
-2,00
-1,00
0,00
1,00
2,00
3,00
78a 139a 23a 9a 15a 69a 21a 114a 26a 113a 112a 67a 18a 1a 138a 108a 109a 24a 12a 172a 7a 169a 177a
Z-SC
OR
ES
LAB ID
PHOSPHOROUS IN COAL Z-SCORES
Page 18 of 22
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : TOTAL CARBON (%)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE
Z-SCORE (DRY BASE)
1a 3,06 69,31 71,50 -0,43
9a 1,88 70,40 71,75 -0,19
12a 2,70 69,30 71,22 -0,68
18a 2,76 70,67 72,68 0,66
21a 2,23 70,17 71,77 -0,17
40a 2,47 72,73 74,57 2,41
42a 2,06 69,50 70,96 -0,92
49a 1,76 70,65 71,92 -0,04
66a** 1,98 69,35 70,75 -1,12
88a 2,75 69,29 71,25 -0,66
99a** 2,30 69,20 70,83 -1,04
108a 2,70 69,86 71,80 -0,15
109a 2,80 69,85 71,86 -0,09
145a** 2,37 72,05 73,80 1,70
177a 1,47 71,67 72,74 0,72
Number of results - 15 15 15 -
OUTLIERS - - 0 0 -
AVERAGE - 2,41 70,27 71,96 -
MEDIAN - - 69,86 71,77 -
STD DEVIATION - - 1,11 1,08 -
ROBUST AVERAGE - - 70,16 71,85
ROBUST STD DEVIATION - - 1,25 1,12
UoM - - 0,40 0,36
REPRODUCIBILITY
UPPER LIMIT - - - 72,96 -
LOWER LIMIT - - - 70,96 -
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : HYDROGEN (%)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE
Z-SCORE (DRY BASE)
1a 3,06 3,58 3,69 -0,66
9a 1,88 3,62 3,69 -0,68
12a 2,70 3,74 3,84 0,26
18a 2,76 3,49 3,59 -1,29
21a 2,23 3,82 3,91 0,64
36a 2,20 3,54 3,62 -1,10
42a 2,06 3,77 3,85 0,29
88a 2,75 3,60 3,70 -0,63
99a 2,30 3,63 3,72 -0,52
108a 2,70 3,79 3,89 0,55
109a 2,80 3,85 3,96 0,97
177a** 1,47 4,10 4,16 2,18
Number of results 12 12 12
OUTLIERS - - 0 0 -
AVERAGE - 2,49 3,71 3,80 -
MEDIAN - 3,69 3,78 -
STD DEVIATION - - 0,17 0,16 -
ROBUST AVERAGE - - 3,69 3,79
ROBUST STD DEVIATION - - 0,17 0,17
UoM - - 0,06 0,06
REPRODUCIBILITY
UPPER LIMIT - - - 4,05 -
LOWER LIMIT - - - 3,55 -
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : NITROGEN(%)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE
Z-SCORE (DRY BASE)
9a 1,88 1,65 1,68 0,48
12a 2,70 1,75 1,80 1,94
18a 2,76 1,47 1,51 -1,64
42a 2,06 1,64 1,67 0,39
88a 2,75 1,55 1,59 -0,66
99a 2,30 1,60 1,64 -0,07
108a 2,70 1,54 1,58 -0,75
109a 2,80 1,59 1,64 -0,09
177a 1,47 1,65 1,67 0,39
Number of results 9 9 9 -
OUTLIERS - - 0 0 -
AVERAGE - 2,58 1,60 1,64 -
MEDIAN - 1,60 1,64 -
STD DEVIATION - - 0,08 0,08 -
REPRODUCIBILITY
UPPER LIMIT - - - 1,79 -
LOWER LIMIT - - - 1,49 -
Page 19 of 22
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : ASH FUSION TEMPERATURES (oC)
LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW
1a 1500 1500 1500 1500
9a 1500 1500 1500 1500
10a 1500 1500 1500 1500
18a 1500 1500 1500 1500
21a 1500 1500 1500 1500
23a 1395 1433 1460 1490
40a 1500 1500 1500 1500
42a 1470 1490 1500 1500
49a 1500 1500 1500 1500
60a 1500 1500 1500 1500
66a 1395 1420 1450 1485
80a 1500 1500 1500 1500
95a 1500 1500 1500 1500
99a 1500 1500 1500 1500
108a 1500 1500 1500 1500
109a 1500 1500 1500 1500
110a 1500 1500 1500 1500
112a 1450 1490 1500 1500
131a 1500 1500 1500 1500
151a 1490 1500 1500 1500
Number of results 20 20 20 20
Outliers 0 3 2 2
AVERAGE 1485 1500 1500 1500
MEDIAN 1500 1500 1500 1500
STDEV 33 0 0 0
REPRODUCIBILITY
UPPER LIMIT 1500 1500 1500 1500
LOWER LIMIT 1405 1440 1440 1420
Z-SCORES
LAB ID DEFORMATION SOFTENING HEMISPHERE FLOW
1a 0,45 0,00 0,00 0,00
9a 0,45 0,00 0,00 0,00
10a 0,45 0,00 0,00 0,00
18a 0,45 0,00 0,00 0,00
21a 0,45 0,00 0,00 0,00
23a -2,70 -3,00 -3,00 -3,00
40a 0,45 0,00 0,00 0,00
42a -0,45 -3,00 0,00 0,00
49a 0,45 0,00 0,00 0,00
60a 0,45 0,00 0,00 0,00
66a -2,70 -3,00 -3,00 -3,00
80a 0,45 0,00 0,00 0,00
95a 0,45 0,00 0,00 0,00
99a 0,45 0,00 0,00 0,00
108a 0,45 0,00 0,00 0,00
109a 0,45 0,00 0,00 0,00
110a 0,45 0,00 0,00 0,00
112a -1,05 -3,00 0,00 0,00
131a 0,45 0,00 0,00 0,00
151a 0,15 0,00 0,00 0,00
Page 20 of 22
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : ASTM ASH (%)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%)
Z-SCORE (DRY BASE)
1a 3,06 14,37 14,82 -0,35
109a 2,80 14,60 15,02 1,13
172a 1,87 14,49 14,77 -0,78
Number of results - 3 3 3 -
OUTLIERS - - 0 0 -
AVERAGE - 2,93 14,49 14,87 -
STD DEVIATION - - 0,12 0,13 -
MEDIAN - - 14,49 14,82 -
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : ASTM VOLS (%)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY (%) DRY BASE (%)
Z-SCORE (DRY BASE)
1a 3,06 23,60 24,34 1,21
108a 2,70 23,20 23,84 -0,02
109a 2,80 23,20 23,87 0,04
172a 1,87 22,91 23,35 -1,24
Number of results - 4 4 4 -
OUTLIERS - - 0 0 -
AVERAGE - 2,85 23,23 23,85 -
STD DEVIATION - - 0,28 0,41 -
MEDIAN - - 23,20 23,86 -
ANALYTICAL PARAMETER : CHLORINE (ppm)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE
Z-SCORE (DRY BASE)
12a 2,70 100 103 1,10
108a 2,70 93 96 -0,84
109a 2,80 95 98 -0,26
177a 1,47 279 283 50,05
Number of results - 4 4 4 -
OUTLIERS - - 1 1 -
AVERAGE - 2,42 96 99 -
STD DEVIATION - - 4 4 -
MEDIAN - - 95 98 -
COAL CONCEPTS - PROFICIENCY TESTING -SEPTEMBER 2018
ANALYTICAL PARAMETER : FLUORINE (ppm)
LAB ID
MOISTURE IN ANALYSIS SAMPLE (%) AIR DRY DRY BASE
Z-SCORE (DRY BASE)
1a 3,06 233 240 -1,66
12a 2,70 250 257 0,19
108a 2,70 250 257 0,19
109a 2,80 250 257 0,22
177a 1,47 261 265 1,07
Number of results - 5 5 5 -
OUTLIERS - - 0 0 -
AVERAGE - 2,82 249 255 -
STD DEVIATION - - 10 9 -
MEDIAN - - 250 257 -
Page 21 of 22
CONCLUSION
1. The overall ISO Ash determination trend was evenly distributed. The average, robust average and median were the same. Two outliers were detected using Grubbs estimate.
2. The overall ISO volatile determination trend was evenly distributed. Five outliers were detected, which
seemed to be due to a combination of calculation and analytical errors.
3. Calorific value graph indicated an almost even z-score trend. No outliers were detected.
4. Sulphur determination had an even z-score trend. Five outliers were detected that seemed to be due to analytical problems related to instrument calibration or swopped samples.
5. Two outliers were detected on phosphorous analysis, one of which seemed like a calculation error and the
other an analytical error. The median, robust average and mean compared well with each other indicating that the extreme values did not affect the centralized values.
6. Carbon, Hydrogen and Nitrogen analysis was well done. No outliers were detected.
7. AFT results: This round of coal had a high melting point. Some laboratories that had melting points less than 1500oC from the softening stage onward, had a z-score of -3 assigned, as the standard deviation had a z-score of zero assigned to it. (cannot divide numbers by zero)
8. Assessment criterion for homogeneity check (From ISO 13528, page 45)
8.1 Comparison of the between sample standard deviation with the standard deviation for proficiency testing Standard deviation for ISO ash =0.14 Check value = 0.14 x 0.3 = 0.042
Between sample standard deviation = 0.043 The between standard deviation is greater than the check value for the criterion assessment for
homogeneity, therefore the following assessment will be used to establish homogeneity:
Calculate ơ2 allow = (0.3 ơpt) 2 = (0.3x0.14) 2 = 0.001764
Calculate c = F1 ơ2 allow + F2s2w = (1.59 x 0.001764) + (0.57 x 0.009801) = 0.008
√𝑐 > 𝑆𝑠 samples are homogenous
√0.008 = 0.091
Since 0.043 is less than 0.091, the batch of test items is homogenous.
COAL CONCEPTS: Terms and Conditions
Return of results:
Page 22 of 22
Laboratories participate in proficiency testing programs on the understanding that they will be sharing their results and information anonymously with other laboratories performing the same analysis. No return of results compromises the spirit of the programs, and reports will not be sent to laboratories unless they return results. Payment in full is required from all laboratories enrolling whether they return results or not. Errors in Participant Proficiency Testing Results: Proficiency testing reports should reflect the level of accuracy that a regular testing client would receive. If a participant finds an error in their proficiency testing results, they may notify us in writing and change their submission PRIOR to the due date for return. Changes after this time will not be accepted. Coal Concepts’ reports results as submitted by participants. On occasion, it seems as though participants have mixed up the samples or not processed the samples according to the instructions. Coal Concepts cannot make assumptions of this nature and change results 'to suit'. We also cannot compromise the integrity of the programs by suggesting to some participants that they should review their results prior to the due date. (This is unfair to other participants) It is the responsibility of the participants to check all aspects of the program, including sample identification, preparation, testing instructions, calculations and reporting of the results prior to results submission. If samples are not in good condition on arrival to the participant laboratory, Coal Concepts must be notified in writing IMMEDIATELY, as often samples can be replaced in good time. Claims about samples received in bad condition will not be accepted after the report has been issued. Late Enrolments and Late Results: Late enrolment requests cannot always be accommodated, as sample manufacture must be scheduled well in advance to the shipping date of the program to allow all necessary quality assurance activities to be carried out. Shipping of PT materials and evaluating test results from PTPs out of cycle with the mainstream programs is considerably time consuming and therefore costly. In order not to disadvantage participants able to comply with time frames, Coal Concepts may charge a late fee in the following circumstances: Requests that Coal concepts staff enters results on behalf of participants Requests to record results after the due date Requests for PTP participation that is out of cycle with the scheduled dates Shipping fees and Customs clearance: Costs incurred for shipping samples and clearance of same through customs are the responsibility of the participating laboratory unless otherwise indicated Non-payment of fees: Coal Concepts retains the right to withhold reports and/or test materials and services when invoices are outstanding. Confidentiality of results: All data and information received by Coal Concepts from its clients are considered confidential unless the client has given express permission to pass on information. Definitions: The dictionary definitions of “collusion” and “falsification” are as follows. · Collusion: A secret agreement or cooperation for a fraudulent or deceitful purpose. · Falsification: Deliberately changing something to be false. In proficiency testing terms, collusion is comparing data (and perhaps changing data) to fit in with a believed “correct” result. This is contrary to the spirit of proficiency testing programs, which are issued with the intention of providing an objective comparison of a laboratory’s performance with others. Coal Concepts tries to minimise the occurrence of collusion by being aware that laboratories should be objective when they report their results, and should therefore not know the intended results at the time they are reporting to us. Answers are not provided to clients until results have been submitted. To prevent collusion and falsification our advice to clients is: DON’T confer with others about PT samples or results. DO accept the fact that everyone makes errors. DON’T average the results or opinions of every person in the laboratory before selecting the answer to be submitted. Instead, use one of the answers AS SUBMITTED to you and take advantage of the Coal Concepts internal QA services and submit all answers generated by the technicians. DO have confidence in your own results. Proficiency Testing (PT) is a compulsory part of laboratory accreditation, but it is also an important tool for giving you confidence in your results. “Enhancing” your PT results with assistance from another participant cannot increase confidence in your laboratory’s performance. Coal concepts’ testing staff are not told what the expected results are, nor what we are expecting. We subject ALL results to analysis, even if they are different. The staff have the right to check that the results we enter on their behalf are correctly transcribed. Clients are always welcome to contact Coal Concepts to seek advice or information about collusion or falsification of data. Policy for Participant Appeal of PT Performance Assessment: If participants disagree with their performance assessment in a proficiency report, they should inform Coal Concepts in writing. The response will include Coal Concepts interpretation of the outcome of the reassessment and an explanation of that outcome. (For example, explanation of a calculation, or the rationale for the outcome of the evaluation.) If a mistake has been made by Coal Concepts, it will be dealt with via Coal Concepts’ non-conformance system. Liability In no event shall a party's liability to the other party for direct damages exceed an amount equal to the value of the amount for the PT Programme, under that specific month End of report