Matrix modification for determination of selenium in geological samples by graphite-furnace atomic-absorption spectrometry after preseparation with thiol cotton fibre.
A graphite-furnace atomic-absorption method has been developed for the determination of selenium in geological samples at or below the mug g level after decomposition of the sample with a mixture of perchloric, hydrofluoric and nitric acids and separation of selenium from the sample matrix with thiol cotton fibre. A few micrograms of palladium are added as a matrix modifier for the atomic-absorption determination. In the presence of palladium the charring temperature for selenium can be raised to 1100 degrees , and the signal enhancement is greater than with other matrix modifiers reported in the literature.
Xiao-Quan
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Institute of Environmental Chemistry, Academia Sinica, P.O. Box 934, Beijing, People's Republic of China.
Kai-Jing
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