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

Dep. of Soil and Environmental Sciences, Univ. of California, Riverside, CA 92521

*Corresponding author.

ABSTRACT

A method has been developed for the determination of arsenate (AsO^3–₄) 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 AsO^3–₄ and PO^3–₄ was R_s = 1.93. The method allows precise (RSD, relative standard deviation = 1.12 to 7.87%) trace amount measurement of AsO^3–₄ (detection limit, 0.092 mg L^–1) in the presence of Cl, NO^–₃, PO^3–₄ and SO^2–₄. The AsO^3–₄ signal becomes masked limiting separation and detection when PO^3–₄ exceeds 30 mg L^–1. Under the conditions described, arsenite (AsO^3–₃) was not detected. Analysis of aqueous soil extracts for AsO^3–₄ 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.

Received for publication February 15, 1988.