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This article in SSSAJ

  1. Vol. 52 No. 6, p. 1603-1606
     
    Received: Feb 15, 1988
    Published: Nov, 1988


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doi:10.2136/sssaj1988.03615995005200060016x

Single-Column Ion Chromatography: IV. Determination of Arsenate in Soils

  1. H. C. Mehra and
  2. W. T. Frankenberger 
  1. Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521

Abstract

Abstract

A method has been developed for the determination of arsenate (AsO3−4) in aqueous soil extracts by single-column ion chromatography (SCIC) at trace levels. The eluent stream consisted of 6 mM p-hydroxybenzoic acid (PHBA) at pH 7.0. Separation was carried out on a low-capacity anion-exchange resin column with the anion species being quantified by conductometric detection. Resolution between AsO3−4 and PO3−4 was Rs = 1.93. The method allows precise (RSD, relative standard deviation = 1.12 to 7.87%) trace amount measurement of AsO3−4 (detection limit, 0.092 mg L−1) in the presence of Cl, NO3, PO3−4 and SO2−4. The AsO3−4 signal becomes masked limiting separation and detection when PO3−4 exceeds 30 mg L−1. Under the conditions described, arsenite (AsO3−3) was not detected. Analysis of aqueous soil extracts for AsO3−4 by SCIC agrees closely with those values obtained by atomic absorption spectrometry and inductively coupled plasma emission.

Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside.

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