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Analysis of simulated Martian regolith using an array of ion selective electrodes

机译：使用离子选择性电极阵列分析模拟火星重熔岩

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摘要

A prototype miniature array of polymer membrane and solid state ion selective electrodes was developed for the purpose of performing an in-situ analysis of the soluble ionic species in Martian regolith (soil). The array contains a total of 27 electrodes for K+, Na+, Ca2+, Mg2+, NH4+, Ba2+, NO3-, Cl-, and Li+, each in triplicate. Barium electrodes were used to indirectly monitor sulfate through precipitation by the addition of barium chloride while the lithium electrodes served as a reference for the array by having a constant lithium concentration as a background for all solutions. The array was tested with several types of simulants, soils, and sawdust from a Mars meteorite, all with varying salt content, meant to approximate the various hypotheses regarding the ionic composition of the Martian soil. The activities of anions and cations determined with the array were compared to ion chromatography data.
机译：聚合物膜和固态离子选择性电极的原型微型阵列被开发出来，目的是对火星长石（土壤）中的可溶性离子种类进行原位分析。该阵列总共包含27个K +，Na +，Ca2 +，Mg2 +，NH4 +，Ba2 +，NO3-，Cl-和Li +电极，一式三份。钡电极用于通过添加氯化钡来通过沉淀间接监测硫酸盐，而锂电极则通过将恒定的锂浓度作为所有溶液的背景，以此作为阵列的参考。该阵列用来自火星陨石的几种模拟物，土壤和锯末进行了测试，所有盐含量均变化，意在近似有关火星土壤离子组成的各种假设。将通过阵列测定的阴离子和阳离子的活性与离子色谱数据进行比较。

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