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MEDGEO 2013 Conference. CHARACTERIZATION OF SORPTION AND QUANTITATIVE ANALYSIS OF HYDROXYL COMPLEXES CHARACTERIZATION OF SORPTION AND QUANTITATIVE ANALYSIS OF HYDROXYL COMPLEXES OF Cu and Zn IN AQUEOUS SOLUTION: THE INTERACTIVE EFFECTS OF MINE WASTEWATER-MIXED MINERAL SYSTEMS
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MEDGEO 2013 Conference • CHARACTERIZATION OF SORPTION AND QUANTITATIVE ANALYSIS OF HYDROXYL COMPLEXES • CHARACTERIZATION OF SORPTION AND QUANTITATIVE ANALYSIS OF HYDROXYL COMPLEXES OF Cu and Zn IN AQUEOUS SOLUTION: THE INTERACTIVE EFFECTS OF MINE WASTEWATER-MIXED MINERAL SYSTEMS • EGIRANI, D.E 1, ANDREWS, J 2 AND JICKELLS,, T 2 • FACULTY OF SCIENCE, NIGER DELTA UNIVERSITY WILBERFORCE ISLAND, NIGERIA • SCHOOL OF ENVIRONMENTAL SCIENCES, UNIVERSITY OF EAST ANGLIA, UK • E-mail: eenonidavidson@yahoo.com • IN PRESS IJRSR 209 OF 2013
HEALTH IMPLICATIONS • 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
ISOTHERM and % SORPTION • 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 • % metal sorbed = • where C1 and Ce are the initial and equilibrium metal concentrations
ASSUMPTIONS • 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 • 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+ +OH- • Zn(OH)2 ⇒ZnOH+ +OH-
:ISOTHERM - PARYS MOUNTAIN MINE WATER actual and theoretical % sorption difference vs. pH of mixed mineral systems (a.kaolinite-mont, b. kaol-goethite and c. mont-goethite
ISOTHERM- CWMRHEIDOL MINE WATER • actual and theoretical % sorption difference vs. pH of mixed mineral systems (a.kaolinite-mont, b. kaol-goethite and c. mont-goethite
Copper and Zinc hydroxylation Plot of saturation indices vs. pH of mine wastewater
Conclusions • 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