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首页> 外文期刊>Environmental Science & Technology >Fast Potentiometric CO_2 Sensor for High-Resolution in Situ Measurements in Fresh Water Systems
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Fast Potentiometric CO_2 Sensor for High-Resolution in Situ Measurements in Fresh Water Systems

机译：快速电位CO_2传感器，用于淡水系统中的高分辨率原位测量

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摘要

We present a new potentiometric sensor principle and a calibration protocol for in situ profiling of dissolved CO2 with high temporal and spatial resolution in fresh water lakes. The sensor system is based on the measurement of EMF between two solid-contact ion selective electrodes (SC-ISEs), a hydrogen ion selective and a carbonate selective sensor. Since it relies on SC-ISEs, it is insensitive to changes in pressure, thus suitable for in situ studies. Also, as it offers a response time (t(95%)) of 10 s, it allows for profiling applications at high spatial resolution. The proposed optimum in situ protocol accounts for the continuous drift and change in offset that remains a challenge during profiling in natural waters. The fast response resolves features that are usually missed by standard methods like the classical Severinghaus CO2 probe. In addition, the insensitivity of the presented setup to dissolved sulfide allows also for measurements in anoxic zones of eutrophic systems. Highly resolved CO2 concentration profiles obtained by the novel and robust SC-ISE setup along with the developed optimum in situ protocol allow investigating hotspots of biogeochemical processes, such as mineralization and primary production in the water column and help improving estimates for CO2 turnover in freshwater systems.
机译：我们提出了一种新的电位传感器原理和校准协议，用于在淡水湖泊中以高时空分辨率对溶解的CO2进行原位剖析。该传感器系统基于两个固体接触离子选择性电极（SC-ISE），氢离子选择性和碳酸盐选择性传感器之间的EMF的测量。由于它依赖于SC-ISE，因此对压力变化不敏感，因此适合于原位研究。而且，由于它提供了小于10 s的响应时间（t（95％）），因此可以在高空间分辨率下进行性能分析应用程序。拟议的最佳原位协议说明了连续漂移和偏移量变化的问题，这在自然水域剖析期间仍然是一个挑战。快速响应解决了标准方法（例如经典的Severinghaus CO2探针）通常无法实现的功能。另外，所提出的装置对溶解的硫化物的不敏感性也允许在富营养化系统的缺氧区域中进行测量。通过新颖而强大的SC-ISE设置以及已开发的最佳原位协议获得的高分辨率CO2浓度分布图，可以研究生物地球化学过程的热点，例如水柱中的矿化和初级生产，并有助于改善淡水系统中CO2转化的估算。

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  • 来源
    《Environmental Science & Technology》 |2018年第19期|11259-11266|共8页
  • 作者

    Athavale Rohini; Pankratova Nadezda; Dinkel Christian; Bakker Eric; Wehrli Bernhard; Brand Andreas;

  • 作者单位

    Eawag Swiss Fed Inst Aquat Sci & Technol, Dept Surface Waters Res & Management, Seestr 79, CH-6047 Kastanienbaum, Switzerland;

    Univ Geneva, Dept Inorgan & Analyt Chem, Quai E Ansermet 30, CH-1211 Geneva, Switzerland;

    Eawag Swiss Fed Inst Aquat Sci & Technol, Dept Surface Waters Res & Management, Seestr 79, CH-6047 Kastanienbaum, Switzerland;

    Univ Geneva, Dept Inorgan & Analyt Chem, Quai E Ansermet 30, CH-1211 Geneva, Switzerland;

    Eawag Swiss Fed Inst Aquat Sci & Technol, Dept Surface Waters Res & Management, Seestr 79, CH-6047 Kastanienbaum, Switzerland;

    Eawag Swiss Fed Inst Aquat Sci & Technol, Dept Surface Waters Res & Management, Seestr 79, CH-6047 Kastanienbaum, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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