A novel chemical sensor with multiple all-solid-state electrodes and its application in freshwater environmental monitoring

能斯特方程 检出限 电极 泥浆 分析化学(期刊) 恒电位仪 持续监测 环境科学 校准 水质 化学 材料科学 水文学(农业) 电化学 环境工程 环境化学 色谱法 生态学 地质学 数学 工程类 岩土工程 统计 生物 物理化学 运营管理
作者
Yifan Zhou,Luis A. J. Mur,Arwyn Edwards,John Walter Davies,Jiwan Han,Huawei Qin,Ying Ye
出处
期刊:Water Science and Technology [Pergamon Press]
卷期号:78 (2): 432-440 被引量:3
标识
DOI:10.2166/wst.2018.310
摘要

Abstract Freshwater quality detection is important for pollution control. Three important components of water quality are pH, ammonia and dissolved H2S and there is an urgent need for a high-precision sensor for simultaneous and continuous measurement. In this study, all-solid-state electrodes of Eh, pH, NH4+ and S2− were manufactured and mounted to a wireless chemical sensor with multiple parameters. Calibration indicated that the pH electrode had a Nernst response with slope of 53.174 mV; the NH4+ electrode had a detection limit of 10−5 mol/L (Nernst response slope of 53.56 mV between 10−1 to 10−4 mol/L). Ag/Ag2S has a detection limit of 10−7 mol/L (Nernst response slope of 28.439 mV). The sensor was cylindrical and small with low power consumption and low storage demand to achieve continuous in-situ monitoring for long periods. The sensor was tested for 10 days in streams at Trawsgoed Dairy farm in Aberystwyth, UK. At the intensively farmed Trawsgoed, the concentration of NH4+ in the stream rose sharply after the application of slurry to adjacent fields. Further, the stream was overhung with extensive vegetation and exhibited changes in pH, which correlated with photosynthetic activity. Measurements of S2− were stable throughout the week. Our data demonstrate the applicability of our multiple electrode sensor.
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