HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Chubin, R. G. Articles by Street, J. J. Search for Related Content PubMed Articles by Chubin, R. G. Articles by Street, J. J. Agricola Articles by Chubin, R. G. Articles by Street, J. J.

Adsorption of Cadmium on Soil Constituents in the Presence of Complexing Ligands¹

ABSTRACT

The objective of this study was to evaluate the effect of natural and synthetic complexing agents on Cd²⁺ adsorption characteristics of metal hydroxides and silicate clay minerals. The solution pH at which 50% of the initial solution Cd²⁺ was adsorbed was 5.40, 7.00, 7.80, and 8.30 for Al(OH)₃, Fe(OH)₃, montmorillonite, and kaolinite, respectively. The presence of citrate (C₆H₅O₇^3-) depressed Cd adsorption on Al(OH)₃, by approximately 25% in acidic solutions. The addition of EDTA (C₁₀H₁₆O₈N₂) depressed the Cd adsorption on both Al and Fe hydroxides, montmorillonite, and kaolinite in acidic and alkaline solutions. The water-soluble organic fraction from sewage sludge enhanced Cd adsorption by both kaolinite and montmorillonite in alkaline solutions. The water-soluble organic fraction from an organic soil (Terra Ceia muck) increased Cd adsorption by Fe(OH)₃ only under acidic conditions.

Preliminary results indicated that considerations of Cd retention by soil constituents should include not only the aqueous chemistry of Cd and the surface chemistry of the adsorbent, but also the chemistry of natural and synthetic complexing agents. The interaction of Cd and various complexing agents can play an important part in determining the fate of this metal in the soil-water-plant environment.

Key Words: specific adsorption • heavy metal solubility • pH-dependence

¹ Contribution from the Dep. of Soil Science, Univ. of Florida, Gainesville, FL 32611. Partial financial support was provided by a grant (EPA-R804570) from the Environmental Protection Agency. Florida Agric. Exp. Stn. Journal series no. 2466.

² Research Graduate Assistant and Assistant Professor, respectively, Soil Science Dep., Univ. of Florida, Gainesville.

Received for publication June 30, 1980.

This article has been cited by other articles:

				R. N. Collins, G. Merrington, M. J. McLaughlin, and J.-L. Morel Organic Ligand and pH Effects on Isotopically Exchangeable Cadmium in Polluted Soils Soil Sci. Soc. Am. J., January 1, 2003; 67(1): 112 - 121. [Abstract] [Full Text] [PDF]

				R. D. Harter and R. Naidu An Assessment of Environmental and Solution Parameter Impact on Trace-Metal Sorption by Soils Soil Sci. Soc. Am. J., May 1, 2001; 65(3): 597 - 612. [Abstract] [Full Text] [PDF]