In this study, the method proposed by St-Amant et al. based on ionic chromatography was modified to rapidly quantify ²²⁶Ra and ²²⁸Ra by inorganic mass spectrometry in a broad variety of matrices at environmental levels. The sample volume loaded on the cationic resin AG50Wx8 was varied to achieve the highest possible adsorption without any significant loss of retention for radium. The pH and volume for the elution steps were optimized to obtain the highest pre-concentration factor and compatibility with plasma-based instruments and to eliminate interference to the maximum extent possible. Finally, inductively coupled plasma mass spectrometry (ICP-MS) instrumental conditions were investigated and optimized for the quantification of radium. An instrumental detection limit of 0.53 pg L⁻¹ in ²²⁶Ra and 0.47 pg L⁻¹ in ²²⁸Ra were achieved. When combined with the cationic separation procedure for interference removal, the overall method detection limit decreases to 10 fg L⁻¹ in less than 2 hours.

中文翻译：

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通过阳离子萃取和电感耦合等离子体质谱法对环境样品中的镭进行定量的快速，通用和灵敏的方法†

在这项研究中，St-Amant等人提出的方法。改进了基于离子色谱的技术以快速定量²²⁶ Ra和²²⁸通过无机质谱法在环境水平下在各种基质中进行Ra分析。改变负载在阳离子树脂AG50Wx8上的样品体积，以实现最大可能的吸附，而对镭的保留没有任何明显的损失。优化了洗脱步骤的pH和体积，以获得最高的预浓缩系数和与基于血浆的仪器的相容性，并最大程度地消除了干扰。最后，对电感耦合等离子体质谱（ICP-MS）的仪器条件进行了研究，并优化了镭的定量方法。0.53皮克L的仪器检测极限^-1在²²⁶ Ra和0.47皮克大号^-1在²²⁸Ra实现了。当与阳离子分离程序结合以消除干扰时，方法的总检测限在不到2小时内降至10 fg L ^-1。