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Determination of Total Arsenic in Soil by Differential Pulse Polarography¹

ABSTRACT

A technique was developed for the determination of total arsenic (As) in soil using differential pulse polarography. Soil samples were digested with a combination of HNO₃ and H₂SO₄. Total As was determined in 1M HCl after reduction of As(V) to As(III) with hydrazine sulfate. Soil and fly ash standards were analyzed by this method and agreement within one standard deviation between replicates was obtained. Approximately 99% recovery of As was obtained from spiked soil samples.

¹ Cooperative studies between the Northeast Region USDA-ARS, Beckley, WV 25801, and West Virginia University Agric. Exp. Stn., Morgantown, WV 26506.

² Graduate Research Assistant, Research Investigation Leader, and Soil Chemist, respectively, USDA-ARS, Beckley, WV 25801.

Received for publication November 8, 1982. Accepted for publication February 2, 1983.