Determination of Sr isotopic composition and concentration on a single sample aliquot with ⁸⁴Sr-concentrated spike

Abstract

Techniques have been developed to measure Sr isotopic composition and concentration on a single sample aliquot in rock and water samples with ⁸⁴Sr-concentrated spike. A single TIMS measurement of the Sr sample yielded both isotopic composition and concentration after decomposition of mixture of sample and ⁸⁴Sr spike. Standard solutions with different Sr concentrations, made form Johnson-Matthey Specpure SrCO₃ (99.999%), were added by appropriate amount of 84Sr spike solution, and determined the Sr isotopic composition and concentration. The single measurement was adopted to water samples of an Indian river and standard rocks such as JP-1 and JCh-1. We will report the results.