Robust Solid-Contact Ion Selective Electrodes for High-Resolution In Situ Measurements in Fresh Water Systems

被引:49
|
作者
Athavale, Rohini [1 ,2 ]
Dinkel, Christian [1 ]
Wehrli, Bernhard [1 ,2 ]
Bakker, Eric [3 ]
Crespo, Gaston A. [4 ]
Brand, Andreas [1 ,2 ]
机构
[1] Eawag Swiss Fed Inst Aquat Sci & Technol, Dept Surface Waters Res & Management, Seestr 79, CH-6047 Kastanienbaum, Switzerland
[2] ETH, Inst Biogeochem & Pollutant Dynam, Univ Str 16, CH-8092 Zurich, Switzerland
[3] Univ Geneva, Dept Inorgan & Analyt Chem, Quai E Ansermet 30, CH-1211 Geneva, Switzerland
[4] KTH Royal Inst Technol, Sch Chem Sci & Engn, Appl Phys Chem, Teknikringen 36, SE-10044 Stockholm, Sweden
来源
基金
瑞士国家科学基金会;
关键词
CARBON NANOTUBES; POTENTIOMETRIC SENSORS;
D O I
10.1021/acs.estlett.7b00130
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 (<10 s). The proposed design of SC-ISEs based on f-MWCNTs is quite suitable for high-resolution in situ profiling of ionic species in fresh water lakes.
引用
收藏
页码:286 / 291
页数:6
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