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首页> 外文期刊>Analytical methods >Development of anion-exchange high-performance liquid chromatography-inductively coupled plasma mass spectrometry methods for the speciation analysis of inorganic selenium and iodine in groundwater
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Development of anion-exchange high-performance liquid chromatography-inductively coupled plasma mass spectrometry methods for the speciation analysis of inorganic selenium and iodine in groundwater

机译：阴离子交换高效液相色谱-电感耦合等离子体质谱法开发用于地下水中无机硒和碘的形态分析

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This work presents the first report of a method for simultaneous speciation of inorganic selenium and iodine using high-performance liquid chromatography coupled with inductively coupled plasma mass spectrometry (HPLC-ICP-MS). Baseline separation of selenite, selenate, iodide and iodate within a single chromatographic run of 10 min was achieved with the optimized mobile phase of 3 mM ammonium citrate, 25 mM ammonium perchlorate and 2% (v/v) methanol at pH 8.5. The mass spectrometric operating conditions were optimized to detect selenium and iodine simultaneously. Potential matrix effects were addressed and corrected using the standard addition method, and the recoveries (95.7a€“103%) were satisfactory. The repeatability and intermediate precision were satisfactory (the coefficients of variation were all less than 5% and 8%, respectively). The obtained detection limits were 22 ng La?’1 and 23 ng La?’1 for selenite and selenate, respectively, and 4.3 ng La?’1 and 5.4 ng La?’1 for iodide and iodate, respectively, which allows for the speciation of selenium and iodine in groundwater at the ultra-trace level. Groundwater samples collected from a candidate site for the Chinese high-level radioactive waste repository were analyzed. Within the three different groundwater samples, selenate was observed to be the dominant Se species; in addition, the iodide concentration increased and the iodate concentration decreased with increasing sampling depth. With its satisfactory sensitivity and accuracy, this method provides a promising tool for studying the environmental behaviors of selenium and iodine, thereby supporting safety assessments of high-level radioactive waste repositories.
机译：这项工作提供了使用高效液相色谱与电感耦合等离子体质谱联用（HPLC-ICP-MS）同时形成无机硒和碘的方法的首次报告。通过优化的流动相3 mM柠檬酸铵，25 mM高氯酸铵和2％（v / v）甲醇（pH 8.5）的最佳流动相，在10分钟的色谱分离中实现亚硒酸盐，硒酸盐，碘化物和碘酸盐的基线分离。优化了质谱操作条件以同时检测硒和碘。使用标准添加方法解决并纠正了潜在的基质效应，回收率（95.7a？103％）令人满意。重复性和中间精度令人满意（变异系数分别小于5％和8％）。所获得的亚硒酸盐和硒酸盐的检出限分别为22 ng La？'1和23 ng La？'1，碘化物和碘酸盐的检出限分别为4.3 ng La？'1和5.4 ng La？'1。超痕量水平的地下水中硒和碘的形态分析分析了从中国高放废物处置库候选地点收集的地下水样品。在三个不同的地下水样本中，硒酸盐被认为是主要的硒物种。此外，随着采样深度的增加，碘化物浓度增加而碘酸盐浓度减少。该方法具有令人满意的灵敏度和准确性，为研究硒和碘的环境行为提供了有前途的工具，从而支持了高放废物处置库的安全评估。

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