Determination of 90Sr in large mass of apples and cabbages by triple quadruple collision/reaction cell ICP–MS

Abstract

A practical, rapid, and reliable method for the ultra-trace determination of ⁹⁰Sr by triple quadruple collision/reaction cell inductively coupled plasma mass spectrometry (CRC–ICP–MS/MS) has been developed. Suitable sample preparation was investigated, and the chemical separation has been achieved with the decontamination factor over 1 × 10⁵ for interfering nuclide ⁹⁰Zr. The concentrations of ⁹⁰Sr in two kinds of samples were determined successfully, with the average values of 7.2 ± 0.7 fg·g⁻¹, 5.0 ± 0.5 fg·g⁻¹, respectively. The ratios of ⁹⁰Sr to ⁸⁸Sr were 5.2 × 10^–8, 2.2 × 10^–9, respectively, and the instrumental detection limit of ⁹⁰Sr was 0.09 pg·g⁻¹.