A new method of accurate determination of isotopic composition and concentration of strontium in a spike solution used for geochronological works.
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A new method of accurate determination of isotopic composition and concentration of a strontium-84 spike solution was devised for simultaneous determination of strontium contents and isotopic compositions in rocks and minerals by measuring strontium isotopic ratios in spiked samples. In this method, the isotopic composition of strontium in the spike were determined so as to minimize the sum of squares of deviations of spike strontium-84 concentrations which were calculated from measured isotopic ratios of strontium in five different mixtures of the spike and the standard solution. The method can eliminate all mass discriminations occurred during the measurement on a surface ionization mass spectometer. The results were tested by measuring 87Sr/86Sr ratios of Eimer and Amend SrCO3 and JB-1 geochemical reference material, and by determining the strontium content in JB-1. The measurements of strontium isotope ratios in spiked samples give average values of 0.708007 ± 0.000052 and 0.70417 ± 0.00004 for 87Sr/86Sr ratios of E and A SrCO3, and JB-1, respectively. The strontium content in JB-1 was estimated at 457.1±1.3 ppm. These values are very close to reported respective values.
- 日本質量分析学会の論文
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