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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Rapid on-site and naked-eye detection of common nitro pesticides with ionic liquids
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Rapid on-site and naked-eye detection of common nitro pesticides with ionic liquids

机译：快速现场和赤裸眼睛检测与离子液体的普通硝基农药

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摘要

Rapid 'in-field' detection of environmentally hazardous organophosphorus and nitro-containing pesticides is highly essential due to the lethal effects caused by the inhibition of the activity of acetylcholinesterase (AChE). In our present study, we demonstrate a novel sensing approach for the simultaneous analysis of five widely used pesticides (methyl parathion, pendimethalin, dicloran, trifluralin, and PCNB) based on the Meisenheimer complex formation between polynitro aromatic compounds (pesticides) and a nucleophile. This colorimetric determination of pesticides involves the use of an ionic liquid, tetrabutylammonium hydroxide (TBAOH), as the nucleophile, which is titrated against different concentrations of pesticides. The addition of TBAOH to the solutions of pesticides results in the formation of intensely colored complexes, which are visualized using UV-vis and NMR spectroscopies allowing the identification of new bands and peaks corresponding to the formation of Meisenheimer complexes. The limit of detection (LOD) for targeted pesticides was found to be in the range of 0.67-10 μM. Furthermore, the practical application of this method is demonstrated by developing different paper-based sensors. Therefore, the strategy proposed here not only serves as a valuable tool that allows unskilled people to detect hazardous pesticides in agricultural products 'on-site' but also offers a fast and convenient protocol for the identification of dangerous nitro-containing polyaromatic groups like nitro explosives.
机译：由于抑制乙酰胆碱酯酶（ACHE）的活性引起的致命作用，快速的“野外野生动物的含有硝基杀虫剂的检测非常重要。在我们现在的研究中，我们展示了一种新颖的传感方法，用于同时分析基于聚氨基芳族化合物（农药）和亲核试剂的Meisenheimer复合物的五种广泛使用的杀虫剂（甲基硫醇，Pendimethalin，二氯仑，二氟胺和PCNB）。这种比色杀虫剂的测定涉及使用离子液体，四丁基氢氧化铵（TBaOH）作为亲核试剂，其滴定滴定不同浓度的农药。添加TBAOH对农药的溶液导致形成强烈着色的复合物，其使用UV-Vis和NMR光谱可视化，允许鉴定与Meisenheimer络合物的形成相对应的新带和峰。发现靶标农药的检测极限（LOD）在0.67-10μm的范围内。此外，通过开发基于纸张的传感器来证明该方法的实际应用。因此，此处提出的策略不仅可以作为一种有价值的工具，允许不熟练的人在农产品“现场”中检测有害农药，但还提供了一种快速方便的方案，用于鉴定硝基爆炸物等含危险的硝基多芳基团。

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