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Trace Perchlorate Quantification in Small-Volume, High-Chloride Solutions: A Method Supporting Experimental Investigation of Perchlorate Generation on Mars
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-06-08 , DOI: 10.1021/acsearthspacechem.0c00324
Alero J. Gure 1 , Janet C. Dewey 1 , Carrick M. Eggleston 1, 2 , Bruce A. Parkinson 2, 3
Affiliation  

The discovery of abundant perchlorate (ClO4) in Mars regolith has prompted experimental studies of the photo-oxidative production of ClO4 and other oxychlorines from chloride (Cl) in processes involving illuminated semiconducting minerals. These experiments provide limited volumes of solution containing various concentrations of Cl and ClO4 but usually with Cl in substantial excess of ClO4. A simple, one-dimensional isocratic ion chromatography (IC) method for ClO4 quantification was developed to mitigate the challenges of limited sample volume and complex sample pretreatment strategies encountered in other more expensive approaches. For the analysis, the ClO4 ions in a 0.5 mL sample containing up to (35 ± 2) mg/L Cl were concentrated inline on styrene/divinyl benzene resins of an ultratrace anion concentrator column, followed by suppressed conductivity detection. The result is a sensitive method for the determination of trace ClO4 concentrations in solutions containing up to 70,000 times more Cl than ClO4. The limit of quantitation established for this method was 0.5 μg/L ClO4, with an average recovery of 104%.

中文翻译:

小体积、高氯化物溶液中痕量高氯酸盐定量:一种支持火星上高氯酸盐生成实验研究的方法

在火星风化层中发现了丰富的高氯酸盐 (ClO 4 ),这促使对在涉及发光半导体矿物的过程中从氯化物 (Cl )光氧化生产 ClO 4 和其他氧氯的实验研究。这些实验提供了有限的含有不同浓度的Cl溶液体积-和C10 4 - ,但通常有Cl -在显着过量的CLO 4 - 。一种用于 ClO 4的简单的一维等度离子色谱 (IC) 方法开发量化是为了减轻在其他更昂贵的方法中遇到的有限样本量和复杂样本预处理策略的挑战。为了进行分析,将0.5 mL 样品中的 ClO 4 -离子浓度高达 (35 ± 2) mg/L Cl -在线浓缩到超痕量阴离子浓缩柱的苯乙烯/二乙烯基苯树脂上,然后进行抑制电导检测。其结果是痕量CLO的测定的灵敏方法4 -的浓度在溶液中含有高达70000倍氯-比CLO 4 - 。该方法的定量限为 0.5 μg/L ClO 4 ,平均回收率为 104%。
更新日期:2021-06-17
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