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Chemical Distribution and Gaseous Evolution of Arsenic‐74 Added to Soils as DSMA‐74As
Author(s) -
Akins Michael B.,
Lewis Russell J.
Publication year - 1976
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/sssaj1976.03615995004000050018x
Subject(s) - arsenate , chemistry , arsenic , soil water , dissolution , environmental chemistry , phosphorus , organic matter , inorganic chemistry , arsenite , geology , soil science , organic chemistry
Gaseous evolution of 74 As from a soil treated with arsenic‐74 labeled disodium methanearsonate (DSMA‐ 74 As) at 100 µg/g was a function of organic matter addition and moisture conditions. Loss of 74 As was greatest from soils that received an exogenous carbon source and were maintained under wet conditions. Arsenic‐74 sorbed by soils of pH 4, 6, and 8 was fractionated by a differential dissolution procedure commonly used for phosphorus. Iron arsenate (soluble in 0.1 N NaOH) was the most abundant form followed by aluminum arsenate (soluble in 0.5 N NH 4 F). The soils generally contained more aluminum arsenate at pH 4 than at pH 6 or 8. Calcium arsenate fractions (soluble in 0.5 N H 2 SO 4 ) were usually higher at pH 6 and 8 than at pH 4. Water‐soluble forms and nonextractable forms were inversely proportional to each other.