Department of Chemistry, Tufts University , Medford, Massachusetts 02115, United States.
Department of Chemistry and Biochemistry, Montclair State University , Montclair, New Jersey 07043, United States.
Anal Chem. 2017 May 2;89(9):4803-4807. doi: 10.1021/acs.analchem.7b00366. Epub 2017 Apr 19.
Solid contact polymeric ion-selective electrodes (SC-ISEs) have been fabricated using microporous carbon (μPC) as the ion-to-electron transducer, loaded with a liquid membrane cocktail containing both ionophore and additive dissolved in plasticizer. These SC-ISEs were characterized and shown to be suitable for analysis in aqueous environments at pressures of 100 bar. Potassium ISEs, prepared in this manner, showed excellent performance at both atmospheric and elevated pressures, as evaluated by their response slopes and potential stability. These novel SC-ISEs were shown to be capable of measuring K at pressures under which traditional liquid-filled ISEs fail. Furthermore, the effect of pressure on the response of these sensors had little or no effect on potential, sensitivity, or limit of detection. High pressure sensor calibrations were performed in standard solutions as well as simulated seawater samples to demonstrate their usefulness as sensors in a deep-sea environment. These novel SC-ISE sensors show promise of providing the ability to make in situ real-time measurements of ion-fluxes near deep-ocean geothermal vents.
固态接触聚合物离子选择性电极 (SC-ISE) 已通过使用微孔碳 (μPC) 作为离子到电子转换器制造，其中负载含有离子载体和添加剂的液体膜混合物，溶解在增塑剂中。这些 SC-ISE 进行了表征，并被证明适用于在 100 巴压力下的水溶液环境中的分析。通过其响应斜率和电位稳定性评估，以这种方式制备的钾 ISE 在大气压力和升高的压力下均表现出优异的性能。这些新型 SC-ISE 被证明能够在传统的填充液体 ISE 失效的压力下测量 K。此外，压力对这些传感器响应的影响对电位、灵敏度或检测限几乎没有影响。在标准溶液和模拟海水中进行了高压传感器校准，以证明它们作为深海环境中传感器的有用性。这些新型 SC-ISE 传感器有望提供在深海地热喷口附近进行原位实时离子通量测量的能力。
