adsorption of copper on particulates along a salinity gradient
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ADSORPTION OF COPPER ON PARTICULATESALONG A SALINITY GRADIENT
By
SULLEIMAN ADEBAYO ADEDIRAN. B.Sc .• M.Sc .. ~
A ThesisSubml~ted to the School of Graduate Studies
in Partial FulFi Iment of the Requirements, For the Degree
-Doctor of Philosophy
McMaster UniversityApri I. 1985 ©
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ADSORPTION OF COPPER ALONG A SALINITY GRADIENT
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DOCTOR OF PHILOSOPHY(1985)(Geology)
•
McMASTER UNIVERSITYHamilton. Ontario
TITLE:
AUTHOR:
SUPERVISOR:
NU~BER OF PAGES:
Adsorption of Copper on Particulatesalong a sal inity Gradient
Sulleiman Adebayo AdediranB.Sc .• M.Sc. (Univ. of IFe)
ProFessor James R. Kramer
xv. 175
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, To the memory of my Parents•
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A~STRACT
The scavenging or Cu w~s studIed along a sal inity
gradient using a rererence clay mineral (Si I ver Hi I I
I I lite. I Mt-!) and sed i ments ~rom La Have estuary (Nova
Scotia). Experiments were conducted in progressive
(Sal inograd) and batch mixing systems. The adsorption or Cu
in the ~al in~grad is oct signifi,cantly diF~erent From that
in the batch system.. The higher val~es in the Sal inograd
probably rerlect experimental artifacts resulting from the
inclusion or dialysis membrane to retain suspended
particles in each mixing tank or the Sal inograd.
The measured adsorptidn (distribution coerficient.
Kd ) or Cu in the laboratory experiments de~reased
drastically in the low. sal inity regime. This ~u~gests a
dilution phenomena or Cu along an estuarine prori le.;-.
Field measurements or particulate Cu and other trace metals
support th j s h~pothes i s.)
The distribution coerficient varies inversely with
sediment concentrations (100-1000 mg/L). The experimental
data fit the O'Connor & Conno J I y (1980) Power law runct ion:
at sal inities or 2.9-11.0 0/00.
where c • and B~ are empirical coerricients and m is the
sediment concentration. It appears however. that this
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I n verse re 1at ions is strong I y dependent on sa lin i ty ( i.e.•
a and 8 are the sal inity parameters in the Power law runction).
The explanation to this inverse relationship can
be re 1ated part I y to "rad i oco I 10 i d" rormat ion wh i ch tends
to increase the metal concentration in the particulate.
phase. The errects or these colloids are more important at
the lower sol id concentrations than at the higher
concentration. An additional or possibly more important
contributor to the decrease in Kd as particle concentration
increases is inter-particle association. This particle-
particle interaction tends to block adsorption sites as
particle come closer. col I ide and aggregate at large
sediment concentration and higher ionic strength.
The adsorption or Cu prior to and arter chemical
extractions or the particulates. indicates that the organIc
phase is the most important "sink" ror Cu. The order or
importance or the d i rrerent phases in i I lite (I Mt-l) and
La Have sediments is:
Organic> Fe-Mn oxIde »» Clay mIneraI (I 1 1 ite)
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ACKNOWLEDGEMENTS
I.am indebit\d to my research ~upervisor.
James R. Kramer. H\.s-support. interest and •
en~our~gemen~ ove~ the past Four years were invaluable
towards the 'completion of this thesis. I am appreciative
of'theguidance 'and interest shown by the members of my·- .-.
S..,oeT'v i sory Comm i t'!:ee: Drs. B.J. Bur ley. H:D. Grundy.
J.O Nriagu and D.R.' WOOds:'"
•Many others cont;ributeQ in one way or the other
towards th i s study. I thank these peep Ie:
Dr. S. Landsberger For introducing me to neutron
activation analysis.
Drs. D.E. Buck 1ey. R.E. Cranston.' M.A. Rashid.
G. Vi lks and Mr. K.R. Rober~son (BedFord Institute of
Oceanography. Nova Scotia) For their co-operation during,
my Field work.
Pierre Cote (Canada Centre For Inland Waters) For
al lowing me to use his BET equipment.
Mrs. J'i I I Gleed (A.A. ana I ys i s). Messers Ota
Mudroch (XRF analysis) and Jack Whorwood (Photography) For,
their technical assistance.
My co I leagues in the "JRK Team". Franco is Caron.
Steve Dav i es. Pau I a Takats. Laur i e Turner. Peter V i,l ks and
Moire Wadleigh provided me with an atmosphere conducive to
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••this academic upl iFtment, I am indebited to them and
particularly to Peter Vi lks who accompanied me to the Field
and was my I i Fa;uard in the ca I m waters of La Have r i ver-
estuary. Dr. Kurt PulFer (CIBA-GEIGY. Switzerland) was
very helpFul during the construction of the Sal inograd
whiles he was here as a Post doctoral Fel low.
owe-much to my Friends Francis Ajayi. 'Debo Akano
and Sam Aryee For being Friends at all times.
Financial support For this work came From the
University of IFe (Nigeria) and a grant From Energy Mines &
Resources (Canada).
Finally, I appreciate the constant encouragement.
prayers and understanding of my Fami Iy. without which this
dissertation would probably haVe remained uncompleted•
•
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TABLE OF CONTENTS PAGE
\Abstract iv
Acknowledgements vi
List of' I I I ustrat ions xi 1
List of' Tables xvi
I. MET~L~ IN THE AQUATIC ENVIRONMENT
.2.
2.1
2.2
2.2.1
2.2.2
2.2.3
2.3
2.3.1
. 2.3.2
2.4
2.4. 1
2.4.2
2.4.2.1
CONTROLS AND MODELS OF TRACE METAL PATHWAYSIN THE AQUATIC SYSTEMS: A REVIE~
•Introduction
Estuarine Substrates
The Clay Minerals
Hy~rous oxides of' Iron and Manganese
Organ i c Matter
Copper in Estuarine Waters
Speciat{On of' Cu in estuarine systems
Behaviour of' Cu in estuaries
Adsorption: theories. models andand their appl ications
Development of' the Electric Double Layer
Other models and their appl ications
Surf'ace Complexation models
v Iii
5
5
5
6
8
1 1
16
16
20
22
24
24
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,
TABLE OF CONTENTS (CONT'DJ
2.4.2.2 lon-Solvent Interaction model
2.4.2,3 Ion Exchange model
2.4.2.4 • Electrochemical model
2.4.2.5 Organic-Metal-Inorganic-substrateinteractions /
2.5 Simulatory Experiments
2.6 - Summary
3. DEFINITION AND SCOPE OF RESEARCH
4. MATERIALS AND METHODS
PAGE
29
30
" 30
3 I
34
36
39
43
4. 1
4.2
4.3
4.4
4.4.1
4.4.2
.. 4.4.3
4.4.3.1
Introduction
Laboratory Estuarin~Simulation:
Apparatus Des i gn ..-- .
Field Study Area and Sampl ing
Experimental and Analytical Procedures
Substrate Preparation and Characterization
Solution Composition
Adsorption Studies
Equil ibration Time
43
44
48
'50
50
55
55
56
4.4.3.2 pH Control
J4.4.3.3 Radiotracer Technique
4.4.3.4 Adsorption Experiments
ix
__~_m _
56
57
58
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TABLE OF CONTENTS (CONT'D)
,
PAGE
4.4.3.4.1
4.4.3.4.2
4.4.3 ._4. 3
Adsorption onto Dialysis membraneand LEP container
"Copper adsorpt i on on sed i ments
Data Analysis
58
59
6 I
4.5
5.
5. I
5.2
5.3
Extraction Technique
RESULTS
Par~iculate Characteris~ics
Adsorption of Cu onto Di~YSiS-and LPE container
EFFects of hydrodynamic5 on Cuadsorptio"n
membrane
62
65
65
67
70
5.4
. 5.5
5.6
5.7
5.7.1
5.7.2
InFluence of sediment concentration onadsorption
EFFect of the diFFerent components(oF sediments) on adsorption
Comparison of the adsorption behaviour ofIMt-1 and and La Have sediments
Metals in La Have estuary sediments
Total Metal in Particulate phase
Trace Metal Speciation
70
73
76
81
81
84
5.7.2.1 Copper
5. 7.2.2 Mang~nese
5.7.2.3 Iron
5.7.2.4 Zi8C
5.7.2.5 Lead
x
•~_,I
87
91
92
93
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TABLE OF CONTENTS (CONT'D)
5.7.2.6 Cadmium
5.7.2.7 Cobalt
6. DISCUSSION: PATHWAYS OF METALS IN LA HAVER I VER-ESTUjlR.Y
6.1 Introduction
6.2 Sources of metals into La Have river-estuary
6.3 Factors inFluencing the adsorption ofCopper as sal inity changes
6.3. I InFluence of the type of mixing on adsorption
PAGE
94
95
96
96
96
100
100
6.3.2
6.3.3
6.3.4
6.3.5
6.4
7.
7.1'
7.2
EFFect of changes in sal inity onCu adsorption
Impo,tance of the d~erent phases ofsediment as "sinks" For Copper
f
The signiFicapee of the adsorbentconcentrat i o,n on meta.] uptake
Adso!ption model: Extrapolating FromLab~ratory studies to the Field
Environmental SigniFi~ance of the behaviourof Cu .along the salinity gradient
,SUMMARY AND CONCLUSIONS
Summary
Conclusions
REFERENCES
APPEND ICES,
xi
103
108
1 15
;(126
126
127
131
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-LIST OF ILLUSTRATIONS
Fig. 2-1 The inFluence of organics on theadsorption of trace metals by clay minerals
PAGE
14
Fig. 2-2 The inorganic speciation of Cu in 19estuarine waters
Fig. 2-3 Theoretical calculation of thespeciationoF Cu along the sal inity gradient
Fig. 2-4 The progress and drawbacks inthe understanding of the electric double layer.sur~ace charge and adsorption
Fig. 2-5 Adsorption at the oxide-waterinterFace as proposed by the surFace complexationmodels
21
25
27
Fig. 2-6 The possible complexation reaction 33pathways between metals and organic ligands
)Fig. 2-7 The diFFerent possible modes of 35
interaction between organics. metals. clays andhydrousoxides
Fig. 4- I The Sa I i nograd: A laboratory 45analogue of one-dimensional mixing in estuary
F f g. 4-2 The Iocat i on of t~ study -area 49(LaHave river-estuary) and sampl ing stations along-€he estuarwroFi Ie
Fig. 4-3 X-ray peaks of ill i te (l Mt-l) and 53three sediments From La Have estuary
Fig; 4-4 Outine of the Tessier et al.(1979) 64sequential extraction scheme
Fig. 5-1 Percentage adsorption of Cu on 68SpectraPor 6 MWCO 1000 dialysis membrane and 125 mLNalgene LPE container as a Function of sal inity
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LIST OF ILLUSTRATIONS(CONT'O) PAGE
Fig. 5-2 The eFFect of pre-treating 69dialysis membrqne with Cu so"lution beFore theadsorption of "b4Cu (50 ~g/L)
Fig. 5-3 The adsorption of Cuon three 71diFFerent concentrat ions of i I lite (I Mt- I) as aFunction of sal inity in the Sal inograd and theBatch systems
Fig. 5~4 The inFluence of sol id concentrations 75on the adsorption of Cu at diFFerent sal inities
Fig. 5-5 The eFFect of the removal of 77Fe-Mn oxide. organics and organics-Fe/M~ oxideFrom the surFace of IMt-1 i I I ite on the adsorption ofCu along a sal inity gradient
Fig.5-6 The eFFect of the removal of Fe-Mn 78oxide. organics and organics-Fe/Mn oxideFrom thesurFace of La Have estuary sediments on the adsorptionof Cu along a sal inity gradient
Fig. 5-7 Comparison of the adsorptivecapac it i es of I Mt-l i I lite (SH) and sed i ments FromLa Have estuary
80
Fig. 5-8 The concentration proFi Ie of 82metals in the bottom sediments of La Have estuary
Fig. 5-9 ProFi Ie of Cu in the bottom 85sediments in relation to the sal inity gradientand suspended particulate matter (SPM) inLa Have estuary
Fig. 5-10 The speciation of metals along 86the salt gradient of La Have estuary and IMt-1 i I lite
~
Fig. 5-11 The percentage of total metal in 88each of the Tessier et al. extraction Fraction ofLa Have sediments along the sal inity gradient
Fig. 5-12 The proport ions of the exchangeab I e," 89carbonate. Fe-Mn oxide and organics in the non-residualFractions of trace metals in La Have estuary sediments
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LIST OF ILLUSTRATIONS '(CONT'o) PAGE
Fig. 6-1sediments and insa lin i ty prof'i I e
The concentration of' Cu in bottomthe overlaying waters alongtheof' La Have estuary
107
Fig. 6-2 The correlation between the IIIadsorption of' Cu and the total Fe (FeZ03) andorganic matter contents of' La Have estuary sediments
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