作者
Tianling Li, Jared Panther, Yuan Qiu, Chang Liu, Jianyin Huang, Yonghong Wu, Po Keung Wong, Taicheng An, Shanqing Zhang, Huijun Zhao
发表日期
2017/11/21
期刊
Environmental Science & Technology
卷号
51
期号
22
页码范围
13265-13273
出版商
American Chemical Society
简介
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 …
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T Li, J Panther, Y Qiu, C Liu, J Huang, Y Wu, PK Wong… - Environmental Science & Technology, 2017