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The Feasibility of Using Sequential Extraction Techniques for Arsenic and Selenium in Soils and Sediments
Author(s) -
Gruebel Karen A.,
Davis James A.,
Leckie James O.
Publication year - 1988
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/sssaj1988.03615995005200020016x
Subject(s) - selenium , arsenic , soil water , extraction (chemistry) , environmental science , environmental chemistry , geology , soil science , mining engineering , chemistry , chromatography , organic chemistry
Laboratory experiments were conducted with well‐characterized minerals to test the applicability of selective extraction schemes for Se and As partitioning in soils and sediments. Two specific steps were tested: the reductive dissolution of amorphous iron oxides and the oxidation of organic material. Selenium and As associated with amorphous iron oxides were usually not found in solution after reductive dissolution, due to readsorption onto other minerals unaffected by the extractant. Oxidants intended to dissolve organic material also oxidized Se(IV) adsorbed on a mineral to Se(VI), causing the release of Se(VI) to the extractant solution. The selective extraction schemes which are currently available do not appear to produce reliable results for Se and As partitioning among sediment components.