Discussion of correction method for mass fractionation effect of strontium spike isotopic ratios

By taking the determination and calculation method of spiked strontium isotopic ratios as an example, the influence of spike isotopic ratios on the determination of spiked strontium isotopic ratios has been analyzed. For sample-spike mixture, the influencing degree by accuracy of the isotopic ratios of strontium spike on the result of sample strontium isotopic ratio is getting much bigger with the increasing amount of strontium spike. The accuracy of spike isotopic ratios will be influenced by the mass fractionation effect in the determination process. In this study, the mass fractionation effect of strontium spike is corrected by mathematical iterative method. As a result, the accuracy of sample strontium isotopic ratios has been improved. (authors)