A method for 87Sr/86Sr isotope ratio determination in biogenic apatite by MC-ICP-MS using the SSB technique

Abstract

The work presents the method for determining 87Sr/86Sr isotope ratio in biogenic apatite by the multicollector (MC) ICP-MS using the standard-sample bracketing (SSB) technique with preliminary chromatographic separation of Sr. The calibration procedure of chromatographic technique using SR resin is described, including the experiment on the optimization of separation parameters. The effect of matrix elements, such as Na, Mg, P, Ca, Fe, Pb, Zn, In, K on the measurement of the Sr isotope ratio was studied. The analysis of Bone Meal SRM 1486 and Bone Ash SRM 1400 standard reference materials was carried out, and the expanded uncertainty was calculated. The obtained results are in good agreement with the published data.