MEDGEO 2013 Conference
CHARACTERIZATION OF SORPTION AND QUANTITATIVE ANALYSIS OF HYDROXYL COMPLEXES
OF Cu and Zn IN AQUEOUS SOLUTION: THE INTERACTIVE EFFECTS OF MINE WASTEWATERMIXED MINERAL SYSTEMS
EGIRANI, D.E 1, ANDREWS, J 2 AND JICKELLS,, T 2
1. FACULTY OF SCIENCE, NIGER DELTA UNIVERSITY WILBERFORCE ISLAND, NIGERIA
2. SCHOOL OF ENVIRONMENTAL SCIENCES, UNIVERSITY OF EAST ANGLIA, UK
E-mail: eenonidavidson@yahoo.com
IN PRESS IJRSR 209 OF 2013
HEALTH IMPLICATIONS
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Cu and Zn are important in human body metabolism,
lead to poisoning at concentrations above safe limits.
a deficiency can cause growth depression,
in a community where Cu-Zn metal-mineral interaction
exist,
there is need to investigate the behavior of these metals
and their complexes as best revealed by sorption
LOCATION OF STUDY SITE
CHARACTERISTICS OF MINE WATER
FLOW DIAGRAM OF STUDIES
ISOTHERM and % SORPTION
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where Kdtotal is the theoretical distribution
coefficient for a 1:1 mixed suspension,
(a)kaolinite/montmorillonite,(b) kaolinite/goethite
and (c)montmorillonite/goethite
Kdn is the distribution coefficient for n number of
mineral suspensions,
n is the number of mineral suspensions,
ISOTHERM and % SORPTION
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% metal sorbed =
where C1 and Ce are the initial and equilibrium
metal concentrations
ASSUMPTIONS
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differences between single and mixed mineral
sorption are attributed to:
development of secondary mineral phase during
sorbate-sorbent interaction
Activity of components minerals
as individual networks or chemisorbed species.
differential mass of mixed and single mineral
phases
QUANTITATIVE ANALYSIS
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Aqueous speciation calculations using phreeqc
use a chemical composition for a solution as input
and calculate the distribution of aqueous species and
saturation indices for potential complexes.
Cu(OH)2⇒ CuOH+ +OHZn(OH)2 ⇒ZnOH+ +OH-
:
ISOTHERM - PARYS MOUNTAIN MINE WATER
actual and theoretical % sorption difference vs. pH
of mixed mineral systems (a.kaolinite-mont, b. kaolgoethite and c. mont-goethite
ISOTHERM- CWMRHEIDOL MINE WATER
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actual and theoretical % sorption difference vs. pH
of mixed mineral systems (a.kaolinite-mont, b. kaolgoethite and c. mont-goethite
Copper and Zinc hydroxylation
Plot of saturation indices vs. pH of mine wastewater
Conclusions
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None of the mineral systems reduced contaminants
to U.S EPA levels,
for humans and aquatic life,
Parys, mineral mixing favors Cu sorption than Zn,
Cwmrheidol, mixing favors Zn sorption than Cu,
Cu and Zn sorption was a function of the mineral
systems, mine water composition and pH
THE END
Abstract-Presentation ID# 216877
Presented by Dr. Davidson E. Egirani, at the 2013
Conference of the International Medical Geology
Association (25–29 August 2013), Arlington, Virginia,
U.S.A