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On‐Line SPE LC/MS/MS Applications
Dr. Sheher Bano MohsinMass Spectrometry Applications
March 19, 2014
3/21/20141
• Introduction – Why Online SPE?• Sensitivity of the Mass Spectrometers• Application Examples• ‐Water Samples• ‐ Samples with dirty Matrices• Introducing the Flexcube for Online SPE
3/21/20142
Solid Phase Extraction (SPE)
• Wouldn’t it be great if you could automate SPE while reducing sample and solvent volumes?
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Agilent Online SPE System
Switching valves
Quaternary pump
Autosampler
Analytical column for separation
Binary pump for gradient elution
MS/MS
Replace with Flexcube
Agilent 1200 Infinity Series Online SPE solution
Solvent selection valve for up to three solvents
Reciprocating single‐piston pump for flows up to 4 ml/min (60 bar)
up to two Quick‐Change valves, according to application
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Valves mounted in 1290 Infinity Flexible Cube
Online SPE with the Flex Cube
Autosampler with 900uL loop and extension seat capillary
1290 Binary Pump
1290 Autosampler
Column Compartment
6460 QQQ
Flexcube
Autosampler
Flex Cube and Autosampler
Single Piston Pump
6 port valve 10 port valve
Autosampler
6 mLvials
Mass Hunter B 06.00 with Flexcube Control
1260 Bin Pump
System with alternating SPE loading:Load sample to SPE1
SPE2
SPE1
Std. ALS 900 µL head
Flex cube pump Column
waste
Load
SPE starter set
G4742A
1260 Bin Pump
System with alternating SPE loading:Elute sample from SPE1 to column / Load sample 2 on SPE2
SPE2
SPE1
Std. ALS 900 µL head
Flex cube Column
waste
Elute
Load
Mass Spec
Evaluation of On‐line Solid Phase Extraction and Direct Injection‐LC/MS/MS for the Analysis of Chemicals on U.S. EPA’s Contaminant Candidate
List 3
Sheher Bano MohsinMichael Woodman
Chemicals for LC/MS/MS Evaluation*
• 4,4’‐methylenedianiline• 3‐hydroxycarbofuran• bensulide• clethodim• fenamiphos• fenamiphos sulfone
• fenamiphos sulfoxide
•methomyl• quinoline• tebuconazole• tebufenozide• thiodicarb
9 CCL3 chemicals 3 CCL3 degradates
*Slide Taken From: Evaluation of On‐line Solid Phase Extraction‐LC/MS/MS for the Analysis of Chemicals on U.S. EPA’s Contaminant Candidate List 3 ‐ Jody A. Shoemaker and Daniel R. Tettenhorst
Superimposed chromatograms Showing Reproducibility of Retention time as well as Area Counts for two runs Alternating Between two Different SPE Cartridges. The calibration standard used has a concentration of 10 ppt (ng/L) each for all 12 compounds with quantifier and qualifier ions. Each run alternates between two different SPE cartridges.
Mix at 1 ppt
Fenomiphos Sulfoxide
Fenomiphos Sulfone
Tebufenozide
Thiodicarb
Clethodim
Bensulide
Tebuconazole
Fenomiphos
Carbofuran‐3‐Hydroxy
Methomyl
Quinoline
4,4‐diaminodiphenyl methane
Mix at 0.1 ppt
1 ppt and 0.1 ppt
1 ppt
0.1 ppt 1 ppt
0.1 ppt
1ppt
0.1 ppt
1 ppt
0.1 ppt
1 ppt
0.1 ppt
EPA Method 543: Selected Organic Contaminants by Online SPE – LC‐QQQ using the Agilent FlexCube and 6460 Tandem
Quadrupole MS
Don Noot, Ralph HindleVogon Laboratory ServicesCochrane, AB, Canada
Multi‐lab Verification Study of the first online SPE LC/MS EPA method
Goals
• Demonstrate acceptable method performance using Agilent online SPE (Flexible Cube) and LC‐QQQ
• Demonstrate acceptable performance of the Agilent Bond Elut SPE PLRP‐S cartridges
• Method verification requirements:– Accuracy and Precision determination in reagent water and drinking water
• Accuracy: Recoveries between 70 and 130%• Precision: RSDs ≤ 20%
– Determination of LCMRL, using calculator supplied by EPA
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The results show that the Agilent online SPE – LC‐QQQ system produces results (accuracy, precision and LCMRL) very similar to those produced by the US EPA.
The Agilent Bond Elute SPE PLRP‐S cartridge produces results very similar to the Oasis HLB SPE cartridge, which is specified in the US EPA method.
Calibration• Compounds showed best fit using quadratic, 1/X weighting• Fenamiphos example shown (typical), from 0.02 to 20 ng/L
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Calibration Range• Compounds were analysed at different concentrations due to differences
in sensitivity• Calibration standards were prepared and down to levels where the
compounds were not detected• The range of concentrations used for the calibration curves for each
compound is shown in the table
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Compound Range (ng/L)3‐Hydroxycarbofuran 0.20 – 50Bensulide 0.05 – 50Fenamiphos 0.02 – 20Fenamiphos sulfone 0.05 – 50Fenamiphos sulfoxide 0.05 – 50Tebuconazole 0.02 – 20Tebufenozide 0.02 – 20
Accuracy and Precision• Preserved tap water (surface water source) was fortified at a mid‐level
compared to the calibration curve range• Seven fortified replicates were analysed to determine Accuracy and
Precision• Accuracy is presented as the average recovery of all seven replicates• Precision is presented as the % Relative Standard Deviation (%RSD)
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Accuracy ‐ LFB
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Accuracy (%)HLB PLRP‐S EPA*107 102 100104 99.4 102100 100 101101 100 10587.7 94.3 11296.7 102 101101 104 95.2
Accuracy ‐ LFSMAccuracy (%)
HLB PLRP‐S EPA*93.1 103 111100 105 102102 96.3 95104 100 97.2101 95.5 103100 96.1 105101 97.1 88.4
* EPA data from fortifications at a similar concentration level, and from a surface water for LFSM
Precision ‐ LFB
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Precision ‐ LFSM
* EPA data from fortifications at a similar concentration level, and from a surface water for LFSM
Precision (%)HLB PLRP‐S EPA*1.6% 1.7% 4.11.3% 2.7% 4.00.8% 3.4% 4.42.0% 3.7% 3.74.2% 2.0% 5.41.4% 4.0% 3.62.7% 3.4% 2.9
Precision (%)HLB PLRP‐S EPA*4.8% 4.2% 3.53.5% 1.7% 4.00.9% 1.7% 1.82.8% 3.8% 6.76.5% 5.1% 9.85.1% 3.9% 8.31.2% 2.4% 12
LCMRL Calculations• Calculations are determined by entering values in EPA‐supplied LCMRL Calculator3
• LCMRL is defined as the lowest spiking concentration at which recovery of between 50 and 150% is expected 99% of the time by a single analyst
• Requires minimum of 4 replicates at each of 7 fortification levels, plus 4 LRBs• The LCMRL Calculator constructs mean and variance models of measurement as a
function of spiking level• This procedure takes into account both precision and accuracy• When the LCMRL value is not bracketed by the fortified sample levels, the
calculator gives a warning that an additional set of replicates will be needed• Next table shows calculated values and also US EPA values1.• Results are similar to EPA values, and PLRP‐S values are similar to HLB.
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LCMRL Results
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LCMRL (ng/L)
Compound Oasis HLBAgilent PLRP‐
S EPA (Oasis HLB)3‐Hydroxycarbofuran 2.1 3.4 1.7Fenamiphos sulfoxide 0.33 0.48 1.2Fenamiphos sulfone 0.25 0.16 1.4Fenamiphos 0.072 0.078 0.27Tebuconazole 0.21 0.57 1.3Tebufenozide 0.13 0.066 0.47Bensulide 0.73 0.36 1.2
Note: the EPA method specifies use of Ammonium Acetate as the mobile phase. Better sensitivity can be achieved by using Ammonium Formate(especially for 3‐Hydroxycarbofuran)
LCMRL Example Plots
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Fenamiphos sulfoxide Fenamiphos
Discussion and Conclusions• An Agilent on‐line SPE 1260‐1290/6460 LC‐QQQ system is suitable for the analysis of
pesticides and metabolites in drinking water for EPA Method 543.• The Agilent Flexible Cube incorporates seamlessly into the LC system and is controlled
by MassHunter software. Online SPE provides many benefits for the analytical lab.• Agilent Bond Elut SPE PLRP‐S cartridges perform similarly to the Oasis HLB SPE
cartridges for US EPA method 543.– LCMRLs are near or below EPA levels.– Accuracy and Precision values were similar to US EPA values.
• The Agilent Poroshell PhenylHexyl column provides excellent retention and separation of the target compounds.
• The analysis method time (injection to injection) of less than 17 minutes (including online SPE), allows many samples to be automatically processed each day.
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Acknowledgements• Many Thanks to
• Trisa Robarge of Agilent Technologies for supplying the Bond Elute SPE PLRP‐S cartridges
• Sheher Mosin, Bettina Schuhn and Jean‐Francois Roy of Agilent Technologies for advice on setting up the Flexible Cube
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