Abstract The widespread use of organophosphates in agricultural farms for pest control has raised serious concerns over the quality of food and water available to the common public. As an effort to fabricate a sensitive, selective, cost-effective and non-toxic sensor to detect nitro-group containing organophosphates in and vegetable washings, a simple manganese dioxide based sensor was developed. α-Manganese dioxide nano-rods were electrodeposited on platinum disk electrode (MnO2/Pt) and is employed to detect 4-nitrophenyl phosphate (4-NPP). 4-NPP is a model compound that well represents widely used nitro-group containing organophosphates such methyl parathion, parathion, fenitrothion, methyl paraoxon and paraoxon in aqueous medium. Determination of 4-NPP at nanomolar levels was achieved using the fabricated sensor using cyclic voltammetry. The developed sensor was found to show a linear response in the concentration range 100 nM to 900 nM with a Limit of Detection (LOD) of 10 nM and a high sensitivity of 11.68 μA μM−1. The sensor showed good selectivity against many of common inorganic ions and two of the major organophosphates: Quinalphos and Dimethoate but the selectivity is poor among other nitro-group containing aromatics.

中文翻译：

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基于二氧化锰的电化学传感器用于检测蔬菜和饮用水样品中的含硝基有机磷酸盐

摘要 在农业农场中广泛使用有机磷来防治害虫引起了人们对公众可获得的食物和水质量的严重关注。为了制造灵敏、选择性、成本效益高且无毒的传感器来检测蔬菜洗涤液中的含硝基有机磷酸盐，开发了一种简单的基于二氧化锰的传感器。α-二氧化锰纳米棒电沉积在铂圆盘电极 (MnO2/Pt) 上，用于检测磷酸 4-硝基苯酯 (4-NPP)。4-NPP 是一种模型化合物，它很好地代表了水性介质中广泛使用的含硝基有机磷酸盐，例如甲基对硫磷、对硫磷、杀螟硫磷、甲基对氧磷和对氧磷。使用循环伏安法使用制造的传感器实现了纳摩尔水平的 4-NPP 的测定。发现开发的传感器在 100 nM 至 900 nM 的浓度范围内显示线性响应，检测限 (LOD) 为 10 nM，高灵敏度为 11.68 μA μM-1。该传感器对许多常见的无机离子和两种主要的有机磷酸盐：喹诺磷和乐果显示出良好的选择性，但对其他含硝基芳烃的选择性较差。