Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
IPM-Intelligent Pollutant Monitoring ApS, 2690 Karlslunde, Denmark.
Sensors (Basel). 2018 Sep 5;18(9):2961. doi: 10.3390/s18092961.
Glyphosate (Gly) is one of the most problematic pesticides that repeatedly appears in drinking water. Continuous on-site detection of Gly in water supplies can provide an early warning in incidents of contamination, before the pesticide reaches the drinking water. Here, we report the first direct detection of Gly in tap water with electrochemical sensing. Gold working electrodes were used to detect the pesticide in spiked tap water without any supporting electrolyte, sample pretreatment or electrode modifications. Amperometric measurements were used to quantify Gly to a limit of detection of 2 μM, which is below the regulation limit of permitted contamination of drinking water in the United States. The quantification of Gly was linearly proportional with the measured signal. The selectivity of this method was evaluated by applying the same technique on a Gly Metabolite, AMPA, and on another pesticide, omethoate, with a chemical structure similar to Gly. The testing revealed no interfering electrochemical activity at the potential range used for Gly detection. The simple detection of Gly presented in this work may lead to direct on-site monitoring of Gly contamination at drinking water sources.
草甘膦（Gly）是最具问题的农药之一，反复出现在饮用水中。在农药进入饮用水之前，对供水进行持续的现场检测，可以对污染事件提供早期预警。在这里，我们报告了用电化学传感首次直接检测自来水中的草甘膦。金工作电极用于在没有任何支持电解质、样品预处理或电极修饰的情况下检测自来水中的农药。通过安培测量来定量检测 Gly，检测限为 2μM，低于美国允许饮用水污染的规定限值。Gly 的定量与测量信号成正比。通过在 Gly 代谢物 AMPA 和另一种结构类似于 Gly 的农药氧乐果上应用相同的技术，评估了该方法的选择性。测试结果表明，在用于 Gly 检测的电位范围内，没有干扰电化学活性。本工作中提出的 Gly 简单检测方法可能会导致在饮用水源处直接进行 Gly 污染的现场监测。
