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首页> 外文期刊>RSC Advances >An evaluation on the extraction capability of anion exchange membranes for high-precision sulfur isotope measurement by multiple-collector inductively coupled plasma mass spectrometry
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An evaluation on the extraction capability of anion exchange membranes for high-precision sulfur isotope measurement by multiple-collector inductively coupled plasma mass spectrometry

机译：多收集器电感耦合等离子体质谱法评估阴离子交换膜用于高精度硫同位素测量的萃取能力

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Anion exchange membranes (AEMs) are adept at extracting sulfate for sulfur isotope analyses by multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) from natural samples typically with low sulfate concentrations. But up to now, their capability for sulfate extraction is still lacking adequate research. In this study, a series of detailed tests on AEMs for sulfate extraction were developed, which included the tolerance of pH, the effect of competitive anions, and the lowest concentration limit of sulfate uploading. The optimal scope of pH for sulfate exchange is from 3 to 11. Approximately over 90% of sulfate recoveries and reliable sulfur isotope analyses can be achieved when the concentrations of nitrate, chloride, phosphate, carbonate, and bicarbonate are limited in 0.5 mmol per L per cm ~(2) of a piece of AEM. In practice, we suggest that the applicable concentrations are able to increase to 10 times, except for phosphate. The lowest uploading concentration of sulfate that can be adsorbed by the AEM without sulfur isotope fractionation is further detected as 0.5 μmol L ~(?1) though the recovery of sulfate decreases when its concentration is lower than 0.01 mmol L ~(?1) . This research offers insight into realizing accurate and precise sulfur isotope analyses for natural freshwater and marine pore water by MC-ICP-MS.
机译：阴离子交换膜（AEM）擅长从硫酸盐浓度低的天然样品中通过多收集器电感耦合等离子体质谱（MC-ICP-MS）提取硫酸盐进行硫同位素分析。但是到目前为止，它们的硫酸盐萃取能力仍缺乏足够的研究。在这项研究中，开发了一系列用于硫酸盐萃取的AEM的详细测试，包括pH的耐受性，竞争性阴离子的影响以及硫酸盐上载的最低浓度极限。硫酸盐交换的最佳pH范围是3至11。当硝酸盐，氯化物，磷酸盐，碳酸盐和碳酸氢盐的浓度限制在0.5 mmol / L时，大约可回收超过90％的硫酸盐并进行可靠的硫同位素分析每平方厘米（2）的AEM。在实践中，我们建议，除磷酸盐外，适用浓度可以增加到10倍。尽管当硫酸盐的浓度低于0.01 mmol L〜（？1）时，硫酸盐的回收率会降低，但AEM无需硫同位素分馏即可吸附的最低硫酸盐上载浓度进一步检测为0.5μmolL〜（？1）。这项研究为通过MC-ICP-MS对天然淡水和海洋孔隙水实现准确而精确的硫同位素分析提供了见识。

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