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Stable isotope compositions of calcium (Ca) provide useful information concerning metabolic alterations of Ca in human and animal bodies. For the measurements of Ca isotope ratio, great care must be taken for the mass spectrometric interferences on Ca isotopes ( 42 Ca + , 43 Ca + , and 44 Ca + ) from doubly charged strontium (Sr) ions ( 84 Sr 2+ , 86 Sr 2+ , and 88 Sr 2+ ). To obtain reliable stable isotope data of Ca, we developed a new correction technique for the mass spectrometric interferences by m Sr 2+ ions based on standard addition method. Addition of a small fraction of Sr onto a Ca solution shifts the measured Ca isotope ratios on a three-isotope diagram (i.e., δ 44 Ca and δ 43 Ca) along a mixing line defined by both the true Ca isotope ratio and the Sr isotope ratio. Therefore, the true Ca isotope ratio of a sample can be obtained as the crossover point of mass dependent fractionation line and the mixing line. With the present correction technique, precise and accurate isotope ratio measurements can be made on analyte solutions having a C Sr /C Ca ratio (concentration ratio) of 0.03, which is 6 times higher than the C Sr /C Ca ratio applicable to the conventional correction technique.

analytical sciences

Correction of Mass Spectrometric Interferences for Rapid and Precise Isotope Ratio Measurements of Calcium from Biological Samples Using ICP-Mass Spectrometry