Isotope Dilution Analysis of Selenite and Selenate in Natural Water Using Microwave-Induced Nitrogen Plasma Mass Spectrometry

MINAMI Hirotsugu, CAI Wanhong, KUSUMOTO Tatsuya, NISHIKAWA Kaiji, ZHANG Qiangbin, INOUE Sadanobu, ATSUYA Ikuo

doi:10.2116/analsci.19.1359

Isotope Dilution Analysis of Selenite and Selenate in Natural Water Using Microwave-Induced Nitrogen Plasma Mass Spectrometry

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MINAMI Hirotsugu

Instrumental Analysis Center, Kitami Institute of Technology
CAI Wanhong

Department of Materials Science, Kitami Institute of Technology
KUSUMOTO Tatsuya

Department of Materials Science, Kitami Institute of Technology
NISHIKAWA Kaiji

Department of Materials Science, Kitami Institute of Technology
ZHANG Qiangbin

Department of Materials Science, Kitami Institute of Technology
INOUE Sadanobu

Department of Materials Science, Kitami Institute of Technology
ATSUYA Ikuo

Department of Materials Science, Kitami Institute of Technology

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抄録

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.