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Effects of pH, organic acids, and inorganic ions on lead desorption from soils

Authors
Journal
Environmental Pollution
0269-7491
Publisher
Elsevier
Publication Date
Volume
143
Issue
1
Identifiers
DOI: 10.1016/j.envpol.2005.11.010
Keywords
  • Lead
  • Adsorption–Desorption
  • Ph
  • Organic Acid
  • Variable Charge Soil

Abstract

Abstract The desorption characteristics of lead in two variable charge soils (one developed from Arenaceous rock (RAR) and the other derived from Quaternary red earths (REQ)) were studied, and the effects of pH value, organic acid, and competitive ions were examined. Desorption of Pb 2+ decreased from nearly 100.0 to 20.0% within pH 1.0–4.0 in both soils, and then the decrease diminished at pH > 4.0. Organic ligands at relatively low concentrations (≤10 −3 mol L −1) slightly inhibited Pb 2+ desorption, but enhanced Pb 2+ desorption at higher concentrations. In this study, citric acid or acetic acid at higher concentrations (>10 −3 mol L −1) had the greatest improvement of Pb 2+ desorption, followed by malic acid; and the smallest was oxalic acid. Desorption of the adsorbed Pb 2+ increased greatly with increasing concentrations of added Cu 2+ or Zn 2+. Applied Cu 2+ increased Pb 2+ desorption more than Zn 2+ at the same loading.

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