pH influence on sorption characteristics of heavy metal in the vadose zone

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Authors:Elzahabi, M.; Yong, R. N.
Author Affiliations:Primary:
McGill University, Department of Civil Engineering and Applied Mechanics, Montreal, QC, Canada
University of Wales at Cardiff, United Kingdom
Volume Title:Geoenvironmental engineering
Volume Authors:Yong, R. N., editor; Thomas, H. R.
Source:Engineering Geology, 60(1-4), p.61-68; British Geotechnical Society, second conference on Geoenvironmental engineering, London, United Kingdom, Sept. 1999, edited by R. N. Yong and H. R. Thomas. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0013-7952
Publication Date:2001
Note:In English. 20 refs.; 4 tables
Summary:Sorption is an important process in the modelling and prediction of the movement of heavy metals in unsaturated clay barriers. This experimental study investigates the effect of pH changes in the acidic range on the sorption characteristics of heavy metals such as: lead, copper and zinc in an unsaturated soil. A series of one-dimensional coupled solute and moisture leaching column tests, using different heavy metal solutions, were conducted on an unsaturated illitic soil at varying pH values. Variations of volumetric water content (VWC) with distance were measured for different time durations, and concentrations of heavy metals in the liquid and solid phases were analysed. Partitioning coefficient profiles of contaminants along the soil column were determined for each individual layer in the soil. Results from column leaching tests showed that the sorption characteristics of heavy metals are controlled by many factors which should be taken into consideration, i.e. the VWC, time of wetting, soil pH, and the influent heavy metal concentrations. Simplification of Kd as a constant and of the VWC as a linear function cannot be considered a good assumption and may lead to an improper evaluation of the sorption phenomena and also to serious errors in predicting contaminant transport through unsaturated soils. Abstract Copyright (2001) Elsevier, B.V.
Subjects:Controls; Experimental studies; Geochemistry; Heavy metals; Leaching; Metals; Migration; One-dimensional models; Partition coefficients; PH; Physicochemical properties; Pollutants; Pollution; Pore water; Sorption; Unsaturated zone
Record ID:2001052751
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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