Gas-Permeable Membrane-Based Conductivity Probe Capable of In Situ Real-Time Monitoring of Ammonia in Aquatic Environments,Environmental Science & Technology

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Gas-Permeable Membrane-Based Conductivity Probe Capable of In Situ Real-Time Monitoring of Ammonia in Aquatic Environments
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1021/acs.est.7b03552
Tianling Li ₁ , Jared Panther _{1,

2} , Yuan Qiu _{1,

3} , Chang Liu _{1,

4} , Jianyin Huang _{1,

5} , Yonghong Wu ₆ , Po Keung Wong ₇ , Taicheng An ₈ , Shanqing Zhang ₁ , Huijun Zhao ₁

Affiliation

Aquatic ammonia has toxic effects on aquatic life. This work reports a gas-permeable membrane-based conductivity probe (GPMCP) developed for real-time monitoring of ammonia in aquatic environments. The GPMCP innovatively combines a gas-permeable membrane with a boric acid receiving phase to selectively extract ammonia from samples and form ammonium at the inner membrane interface. The rate of the receiving phase conductivity increase is directly proportional to the instantaneous ammonia concentration in the sample, which can be rapidly and sensitively determined by the embedded conductivity detector. A precalibration strategy was developed to eliminate the need for an ongoing calibration. The analytical principle and GPMCP performance were systematically validated. The laboratory results showed that ammonia concentrations ranging from 2 to 50 000 μg L^–1 can be detected. The field deployment results demonstrated the GPMCP’s ability to obtain high-resolution continuous ammonia concentration profiles and the absolute average ammonia concentration over a prolonged deployment period. By inputting the temperature and pH data, the ammonium concentration can be simultaneously derived from the corresponding ammonia concentration. The GPMCP embeds a sophisticated analytical principle with the inherent advantages of high selectivity, sensitivity, and accuracy, and it can be used as an effective tool for long-term, large-scale, aquatic-environment assessments.

中文翻译：

基于透气膜的电导率探头能够在水生环境中进行氨的现场实时监测

水生氨对水生生物有毒作用。这项工作报告了一种基于透气膜的电导率探头（GPMCP），该探头用于实时监测水生环境中的氨。GPMCP创新地将透气膜与硼酸接收相结合，以选择性地从样品中提取氨并在内膜界面形成铵。接收相电导率增加的速率与样品中的瞬时氨浓度成正比，可以由嵌入式电导检测器快速而灵敏地确定。开发了一种预校准策略，以消除进行正在进行的校准的需要。分析原理和GPMCP性能得到了系统验证。可以检测到^–1。现场部署结果表明，GPMCP能够在延长的部署期间内获得高分辨率的连续氨浓度分布图和绝对平均氨浓度。通过输入温度和pH数据，可以从相应的氨浓度中同时得出铵浓度。GPMCP嵌入了复杂的分析原理，具有高选择性，灵敏度和准确性的内在优势，可以用作长期，大规模，水生环境评估的有效工具。

更新日期：2017-11-08

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