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Abstract

 

This article in SSSAJ

  1. Vol. 40 No. 5, p. 655-658
     
    Received: Aug 1, 1975
    Accepted: June 3, 1976


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doi:10.2136/sssaj1976.03615995004000050018x

Chemical Distribution and Gaseous Evolution of Arsenic-74 Added to Soils as DSMA-74As1

  1. Michael B. Akins and
  2. Russell J. Lewis2

Abstract

Abstract

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 74As 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 0.1N NaOH) was the most abundant form followed by aluminum arsenate (soluble in 0.5N NH4F). The soils generally contained more aluminum arsenate at pH 4 than at pH 6 or 8. Calcium arsenate fractions (soluble in 0.5N H2SO4) were usually higher at pH 6 and 8 than at pH 4. Water-soluble forms and nonextractable forms were inversely proportional to each other.

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