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Stability and lifetime of potassium solid-contact ion selective electrodes for continuous and autonomous measurements

机译：连续和自主测量钾固体接触离子选择电极的稳定性和寿命

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The current generation of solid-contact ion-selective electrodes (SC-ISE) suffer from lack of stability and lifetime. When using such sensors for remote, continuous, or autonomous measurements, these analytical characteristics are especially critical. In this work we compare several different configurations of ISEs to be deployed for monitoring in extreme environments, and present a novel configuration to improve performance. In particular we compare a polymeric hydrogel-based ISE, used previously in the Wet Chemistry Lab on the Phoenix Mars Lander, with three variations of solid supported nanoporous carbon-based ISEs. The symmetric membrane (SM) solid contact ISE (SM-SC-ISE) shows promise in overcoming many of the analytical problems encountered with hydrogel and solid-state devices. The results indicate that sensors based on the SM configuration provide improvements in both stability, and most importantly reproducibility, over other existing SC-ISEs. Future work will continue testing the SM configuration for use in a variety of extreme environments, including continuous monitoring and in-situ analyses in extraterrestrial environments.
机译：固态接触离子选择电极（SC-ISE）的当前产生缺乏稳定性和寿命。当使用此类传感器进行远程，连续或自主测量时，这些分析特性尤为关键。在这项工作中，我们比较了要部署在极端环境中进行监视的ISE的几种不同配置，并提出了一种新颖的配置来提高性能。特别是，我们将先前在Phoenix Mars Lander的湿化学实验室中使用的基于聚合物水凝胶的ISE与固体支持的纳米多孔碳基ISE的三种变体进行了比较。对称膜（SM）固体接触ISE（SM-SC-ISE）在克服水凝胶和固态设备遇到的许多分析问题方面显示出希望。结果表明，与其他现有的SC-ISE相比，基于SM配置的传感器在稳定性和最重要的可重复性上均提供了改进。未来的工作将继续测试SM配置以用于各种极端环境，包括在地外环境中进行连续监视和原位分析。

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