The Use of Octapole Reaction System ICP-MS for Determination of Arsenic and Selenium Concentrations in 25 Major Rivers Selected throughout Japan
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<I>In the national and international guidelines for drinking water quality, it is recommended that arsenic</I> (As) <I>and selenium</I> (Se) <I>concentrations in drinking water do not exceed 0.01</I> mg L<SUP>-1</SUP> (10 μg L<SUP>-1</SUP>) . <I>Since</I> As <I>and</I> Se <I>concentrations are thought to be lower than 1/10 of the recommended values in>90% of surface river waters, it is difficult to describe nationwide</I> As <I>and</I> Se <I>concentration levels in Japan. The recently developed octapole reaction system for inductively coupled plasma mass spectrometry</I> (ORS-ICP-MS) <I>could achieve low detection limits for</I> As <I>and</I> Se <I>compared to atomic absorption spectrometry and</I> ICP <I>optical emission spectrometry. In this study, direct measurement of trace levels of</I> As <I>and</I> Se <I>in river water for 25 major rivers, 10 samplings per river, were carried out using</I> ORS-ICP-MS. <I>In order to determine</I> As <I>and</I> Se, He <I>gas and</I> H<SUB>2</SUB> <I>gas, respectively, were introduced into the</I> ORS <I>as reaction gas</I>.<BR><I>The concentrations of</I> As <I>and</I> Se <I>were determined in more than 95% of the samples, and the cumulative probability distributions of these elements were on log-normal lines. Their respective geometric mean concentrations were calculated as 0.68</I>μg L<SUP>-1</SUP> <I>and 0.062</I>μg L<SUP>-1</SUP>, <I>and the values were lower than the recommended ones. The concentration ranges of these elements in ten samples collected from the upper stream to the river mouth were usually narrow. Possibly, the observed concentrations originated from weathering of bedrock</I>.
- 社団法人 日本アイソトープ協会の論文
社団法人 日本アイソトープ協会 | 論文
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