Abstract
The tolerable charring temperature for samples containing arsenic can be raised to 1300° C when palladium is added as a matrix modifier. In its presence the sensitivity for arsenic is 50% greater than that in the presence of nickel. Digestion with a mixture of sulphuric and perchloric acids and sodium molybdate is used to decompose soil, coal fly ash and biological samples before the direct determination of μg g −1 concentrations of arsenic by graphite-furnace atomic absorption spectrometry. A mixed acid decomposition procedure is also described.
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