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