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 Van Benschoten, J. E. Articles by Reed, B. E. Search for Related Content PubMed Articles by Van Benschoten, J. E. Articles by Reed, B. E. Agricola Articles by Van Benschoten, J. E. Articles by Reed, B. E.

A Nonelectrostatic Surface Complexation Model for Lead Sorption on Soils and Mineral Surfaces

Dep. of Civil Engineering, State University of New York at Buffalo, Buffalo, NY 14260;

William H. Young

Metcalf and Eddy, Inc., Wallingford, CT 06492;

Mark R. Matsumoto

Dep. of Environmental Engineering, Univ. of California Riverside, Riverside, CA 92521;

Brian E. Reed

Dep. of Civil and Environmental Engineering, West Virginia University, Morgantown, WV 26506.

^* Corresponding author (jev{at}acsu.buffalo.edu).

ABSTRACT

A nonelectrostatic surface complexation model is applied to three data sets of increasing complexity: synthetic data for Pb adsorption to hydrous ferric oxide (HFO); data from the literature involving Pb adsorption to three mineral surfaces (goethite, alumina, and silica); and data for Pb adsorption on a field soil. The model is intended for engineering applications (e.g., soil remediation) rather than to provide a comprehensive description of sorption phenomena. The model is simple enough that it can be implemented on a standard spreadsheet and in its simplest form requires only two fitting parameters. Proton stoichiometry for the surface reactions is determined using Kurbatov plots; total site density (S_T) and surface-binding constant (K_pb) are fit to experimental sorpfion data. Complexation reactions between Pb and major ligands are included in the model. Although similar models have been presented previously by other researchers, dissolved solute speciation often was ignored and applications focused on trace metal adsorption and not on soil contamination and remediation. Model applications to Pb sorption data for mineral surfaces have shown excellent correlation with experimental data (r² values from 0.95 to 0.99, SE of 3–7%). For an environmental soil, r² values f rom 0.82 t o 0.96 and std errors from 4 to 8% were observed. The model simulates effects of solution chemistry on sorption nearly as well as traditional surface complexation models, but with fewer fitting parameters. Interpretation of fitted parameters and guidelines for model use are discussed.

This article has been cited by other articles:

				M. Davranche and J.-C. Bollinger A Desorption-Dissolution Model for Metal Release from Polluted Soil under Reductive Conditions J. Environ. Qual., September 1, 2001; 30(5): 1581 - 1586. [Abstract] [Full Text] [PDF]