Abstract
The interference of copper, nickel and cobalt in the determination of selenium by hydride generation atomic absorption spectrometry is studied. Experiments are described making it possible to study the effect of different sequences of mixing analyte, interferent and reagent (sodium tetrahydroborate). With the device described, it is possible to elucidate the mechanism of interference. Some conclusions are as follows, (i) The interference is partly due to the elimination of the selenium hydride by the reaction products of the reaction of the interferent with sodium tetrahydroborate. (ii) The catalytic decomposition of the reagent also plays an important role, (iii) The reaction of interferent ions with selenium hydride hardly contributes to the interference.
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