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A coprecipitation method using calcium tungstate was developed to remove 87 Sr isobaric interference with 87 Rb prior to measurement of Rb by ID-ICP-MS. Precipitation of calcium tungstate was obtained by adding Ca(NO 3 ) 2 solution and (NH 4 ) 2 WO 4 solution to the sample, where (NH 4 ) 2 WO 4 was added more than the...
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