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Effect of pH on Adsorption of Arsenic and Selenium from Landfill Leachate by Clay Minerals
Author(s) -
Frost R. R.,
Griffin R. A.
Publication year - 1977
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1977.03615995004100010019x
Subject(s) - kaolinite , adsorption , montmorillonite , leachate , clay minerals , chemistry , arsenic , environmental chemistry , inorganic chemistry , mineralogy , organic chemistry
Adsorption of As(V), As(III), and Se(IV) anions from municipal landfill leachate solutions by the clay minerals kaolinite and montmorillonite is strongly dependent upon solution pH. The H 2 AsO 4 ‐ and HSeO ‐ 3 ions are the apparent primary As(V) and Se(IV) species being adsorbed by the clay minerals. Activation of the anion adsorption sites on the clay minerals by H + ions is important in determining the amount of HSeO 3 ‐ ions adsorbed by the clay minerals, but it is apparently not important in determining the amount of H 2 AsO 4 ‐ ions adsorbed. Montmorillonite adsorbed more As(V), As(III), and Se(IV) anions than kaolinite. Although no definite proof is given, the higher adsorption by montmorillonite is attributed to a higher edge surface area. The results of the study suggest that disposal of As and Se wastes in municipal landfills, especially under alkaline conditions, could produce ground water contamination by As and Se.