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- E-ISSN 2288-8985
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- P-ISSN1225-0163
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Studies on Determination of trace amount of Se in Volcanic Rocks by Atomic Absorption Spectrophotometry
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1999, v.12 no.6, pp.484-489
Kim,
C., Sung,
H., Chung,
K., &
Yamaya,
K.
(1999). Studies on Determination of trace amount of Se in Volcanic Rocks by Atomic Absorption Spectrophotometry. Analytical Science and Technology, 12(6), 484-489.
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Abstract
The extraction of trace amounts of Se in volcanic rock was investigated using the hydride generation method and atomic absorption spectrophotometry. The powdered rock, 1.0 g, was decomposed with the mixture of <TEX>$HClO_4$</TEX>, <TEX>$HNO_3$</TEX> and HF in an acid digestion bomb at <TEX>$140^{\circ}C$</TEX> for 2 hours. For the reduction of Se(VI) to Se(IV) in the solution, 10 mL of 6 M HCl and 0.2 mL of 1 M KBr were added to the solution and the mixture was heated for 30~45 minutes. <TEX>$H_2Se$</TEX> was produced by adding 3% <TEX>$NaBH_4$</TEX> as a strong reducing agent, extracted by nitrogen gas, and was absorbed twice into <TEX>$KMnO_4$</TEX>solution. The contents of Se in the solution were determined by generation/AAS. According to the proposed method, 1.0 ng or more of Se was quantitatively extracted and Se levels of 2.5 ng/g or more in rock samples could be determined. For example, Se in a rhyolite was determined with the precision of <TEX>$19.5{\pm}1.3ng/g$</TEX>(95% confidence, n
- keywords
- selenium, hydride generation method, volcanic rock
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