Abstract
Two extraction procedures are described for determination of total arsenic in biological materials. In the first, organic matter is wet-ashed, followed by an extraction with ammonium pyrrolidinedithiocarbmate and chloroform; back-extraction is done with a solution of copper(II) chloride. The second procedure is based on an oxygen-flask combustion with absorption of the products in concentrated hydrochloric acid, followed by reduction of arsenic(V) with potassium iodide; extraction with benzene and back-extraction into 0.1 M hydrochloric acid precede the final measurement by graphite-furnace atomic absorption spectrometry. The accuracy of both methods was proved by analyzing a standrad reference material. Because the oxygen-flask combustion takes only a few minutes, this procedure is preferred for routine applications, although it is restricted to biological materials with arsenic contents of at least 0.3 μg g −1 (dry weight).
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