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 1.FACULTY OF SCIENCE, NIGER DELTA UNIVERSITY WILBERFORCE ISLAND, NIGERIA 2.SCHOOL OF ENVIRONMENTAL SCIENCES, UNIVERSITY OF EAST ANGLIA, UK IN PRESS IJRSR 209 OF 2013 MEDGEO 2013 Conference

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

LOCATION OF STUDY SITE

CHARACTERISTICS OF MINE WATER

FLOW DIAGRAM OF STUDIES

ISOTHERM and % SORPTION  where Kd total is the theoretical distribution coefficient for a 1:1 mixed suspension,  (a)kaolinite/montmorillonite,(b) kaolinite/goethite and (c)montmorillonite/goethite  Kd n is the distribution coefficient for n number of mineral suspensions,  n is the number of mineral suspensions,

ISOTHERM and % SORPTION  % metal sorbed =  where C 1 and C e 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# 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