An online separation and preconcentration method, employing a lab-on-valve system using solid phase extraction, followed by inductively coupled plasma tandem mass spectrometry (ICP-MS/MS), was developed for the analysis of ⁹⁰Sr. The ⁹⁰Sr was separated from ⁹⁰Zr, an isobaric interference present at high concentrations in many samples, and other matrix components using a dual-column setup (Eichrom DGA-B and Sr resins). Any remaining ⁹⁰Zr was then chemically resolved from the ⁹⁰Sr in the ICP-MS/MS using O₂ and H₂ reaction gases. The system requires small sample volumes (10 mL), minimal sample preparation compared to traditional radiometric and other MS techniques and has a processing time of 22 min per sample. Based on a 10 mL sample size, the system limit of detection, limit of quantification and method detection limit (MDL) were 0.47 Bq L⁻¹ (0.09 pg L⁻¹), 1.57 Bq L⁻¹ (0.32 pg L⁻¹) and 1.79 Bq L⁻¹ (0.34 pg L⁻¹), respectively. The robustness of the system and suitability for use in various sample matrices was demonstrated using spiked lake water, spiked groundwater, spiked seawater and radioactive water samples. Recovery of the IAEA 2018 Proficiency Test Exercise water sample (n = 5) was 99% with an RSD of 11.9%. The method thus provides a powerful tool for the rapid analysis of low levels of ⁹⁰Sr in various water/wastewater samples.

在线分离富集方法，采用使用固相萃取，随后通过电感耦合等离子体串联质谱法（ICP-MS / MS）上实验室阀系统，是为分析开发⁹⁰高级的⁹⁰锶分离从⁹⁰ Zr开始，使用双柱设置（Eichrom DGA-B和Sr树脂）在许多样品和其他基质组分中均存在高浓度的等压干扰。然后使用O ₂和H ₂在ICP-MS / MS中从⁹⁰ Sr中化学分离出所有剩余的⁹⁰ Zr反应气体。与传统的辐射测量和其他MS技术相比，该系统所需的样品量小（10 mL），样品制备最少，每个样品的处理时间为22分钟。基于10 mL样品量，系统的检出限，定量限和方法检出限（MDL）为0.47 Bq L ^-1（0.09 pg L ^-1），1.57 Bq L ^-1（0.32 pg L ^-1）和1.79 Bq L ^-1（0.34 pg L ^-1）， 分别。用加标的湖水，加标的地下水，加标的海水和放射性水样品证明了该系统的坚固性和适用于各种样品基质的适用性。IAEA 2018年能力测试的回收率练习水样品（n = 5）为99％，RSD为11.9％。因此，该方法为快速分析各种水/废水样品中的低含量⁹⁰ Sr提供了强大的工具。