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Influence of citric acid and glycine on the adsorption of mercury (II) by kaolinite under various pH conditions

J. Singh, P. M. Huang, U. T. Hammer and W. K. Liaw
Influence of citric acid and glycine on the adsorption of mercury (II) by kaolinite under various pH conditions
Clays and Clay Minerals (February 1996) 44 (1): 41-48

Abstract

This investigation was carried out to study the effect of different concentrations of citric acid and glycine, which are common in freshwaters, on the kinetics of the adsorption of Hg by kaolinite under various pH conditions. The data indicate that Hg adsorption by kaolinite at different concentrations of citric acid and glycine obeyed multiple first order kinetics. In the absence of the organic acids, the rate constants of the initial fast process were 46 to 75 times faster than those of the slow adsorption process in the pH range of 4.00 to 8.00. Citric acid had a significant retarding effect on both the fast and slow adsorption process at pHs of 6.0 and 8.0. It had a significant promoting effect on the fast and slow adsorption process at pH 4.00. Glycine had a pronounced enhancing effect on the rate of Hg adsorption by kaolinite during the fast process. The rise in pH of the system further increased the effect of glycine on Hg adsorption. The magnitude of the retarding/promoting effect upon the rate of Hg adsorption was evidently dependent upon the pH, structure and functionality of organic acids, and molar ratio of the organic acid/Hg. The data obtained suggest that low-molecular-weight organic acids merit close attention in studying the kinetics and mechanisms of the binding of Hg by sediment particulates and the subsequent food chain contamination.


ISSN: 0009-8604
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 44
Serial Issue: 1
Title: Influence of citric acid and glycine on the adsorption of mercury (II) by kaolinite under various pH conditions
Affiliation: University of Saskatchewan, Department of Soil Science, Saskatoon, SK, Canada
Pages: 41-48
Published: 199602
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 32
Accession Number: 1996-056062
Categories: Geochemistry of rocks, soils, and sedimentsMineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: Saskatchewan Fisheries Laboratory, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 199618
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