Robust Solid-Contact Ion Selective Electrodes for High-Resolution In Situ Measurements in Fresh Water Systems
Robust Solid-Contact Ion Selective Electrodes for High-Resolution In Situ Measurements in Fresh Water Systems
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DOI：
10.1021/acs.estlett.7b00130
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发表时间：
2017-07-01
影响因子：
10.9
通讯作者：
Brand, Andreas
中科院分区：
文献类型：
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作者：
Athavale, Rohini;Dinkel, Christian;Brand, Andreas
生物地球化学过程往往局限于水生系统中非常狭窄的区域。因此，需要高分辨率的现场测量来研究这些过程。电位法固体接触离子选择电极(SC-ISES)是一种很有前途的测量工具。在受控实验条件下，SCISE在分析中表现出良好的性能。然而，在现场应用过程中，很少有传感器设计能够承受自然水基质和外部环境条件的挑战。我们以功能化多壁碳纳米管(f-MWCNT)为固体接触，制备了具有氨选择性和pH选择性的SC-ISES。它们的功能在实验室进行了测试，并在富营养化湖泊的垂直剖面上进行了现场应用。传感器在湖中应用期间对强烈的氧化还原变化、高硫化物浓度和明亮的日光条件不敏感。此外，传感器易于制造，响应时间短(
Biogeochemical processes are often confined to very narrow zones in aquatic systems. Therefore, highly resolved in situ measurements are required to study these processes. Potentiometric solid -contact ion selective electrodes (SC-ISEs) are promising tools for such measurements. SCISEs show good performance in analyses under controlled experimental conditions. Very few sensor designs, however, can sustain the challenges of natural water matrices and external environmental conditions during in situ applications. We fabricated ammonium and pH selective SC-ISEs with functionalized multiwalled carbon nanotubes (f-MWCNT) as a solid contact. Their functionality was tested in the laboratory and applied in situ for vertical profiling in a eutrophic lake. Sensors were insensitive to strong redox changes, high sulfide concentrations, and bright daylight conditions during the application in the lake. In addition, sensors are easily fabricated and exhibit short response times (