Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
Isotope Dilution Analysis of Selenite and Selenate in Natural Water Using Microwave-Induced Nitrogen Plasma Mass Spectrometry
Hirotsugu MINAMIWanhong CAITatsuya KUSUMOTOKaiji NISHIKAWAQiangbin ZHANGSadanobu INOUEIkuo ATSUYA
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2003 Volume 19 Issue 10 Pages 1359-1363

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Abstract

Isotope dilution analysis of the sub-μg l-1 levels of selenite and selenate in natural water samples by microwave-induced nitrogen plasma mass spectrometry (MIP-MS) was performed. An appropriate amount of a spike solution containing 78Se-selenite and 78Se-selenate was added to the natural water sample to be analyzed. Both analytes in the water were then concentrated simultaneously by passing the sample through a column that was filled with an anionic exchange resin. After the concentration process, all of the selenite and some of the selenate on the resin were eluted by 0.03 M nitric acid. The residual selenate was eluted by 0.13 M nitric acid. The eluted sample solutions were injected into MIP-MS, and isotope dilution analyses were carried out. Selenite and selenate concentrations as low as 0.01 μg l-1 in the natural water sample were successfully determined by the proposed method.

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© 2003 by The Japan Society for Analytical Chemistry
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