Abstract
A method has been developed for the determination of Te and Se in atmospheric aerosols by ion exchange and atomic absorption (AA) using a graphic furnace atomizer. The method takes advantage of the high sensitivity of AA for Te after removing interfering elements by cation exchange. Up to 3000 ..mu..g of Fe/sup 3 +/, Zn/sup 2 +/, Al/sup 3 +/, Ca/sup 2 +/, K/sup +/, etc., did not interfere with the determination of 1 ..mu..g of Te, but this level of Ag/sup +/, Hg/sup 2 +/, As/sup 3 +/, Cu/sup 2 +/, and Se/sup 4 +/ gave negative errors of 30-80%. Ion exchange reduced the effects of these foreign ions to <10%. Recoveries for Te and Se are 92.3% and 92.0%, respectively. The coefficient of variation was about +/-6% at the 20 ng to 150 ng level of Te and about +/-4% at the 10 ng to 140 ng level of Se.
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