Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.
Department of Physics, Le Quy Don Technical University, Ha Noi, Viet Nam.
Sci Rep. 2020 Oct 14;10(1):17302. doi: 10.1038/s41598-020-74509-8.
This study introduces an applicable colorimetric sensor array for the detection of pesticides in the vapor phase. The array consisted of six metal nanoparticles spotted on the piece of filter paper. 3D-origami pattern was used for the fabrication of a paper-based sensor to decrease the effect of the nanoparticles leaching after exposure to analytes. Exposure to pesticide aerosols caused changes in the color of the array due to the aggregation of nanoparticles. These changes provided selective responses to thion pesticides such as malathion, parathion, chlorpyrifos, and diazinon. The sensing assay could also differentiate between aliphatic and aromatic thions and discriminate amine-containing compounds from the other studied analytes. These finding results are clearly confirmed by both visual detection and multivariate statistical methods. The proposed sensor was successfully developed for the quantitative measurement of pesticide aerosols at a very low concentration. The limit of detection of this method determined for malathion, parathion, chlorpyrifos and diazinon were 58.0, 103.0, 81.0 and 117.0, respectively. Moreover, the array could be employed to simultaneously analyze four studied pesticides. The statistcal results confirmed that the method has high performance for concurrent detection of thions as a major air pollutant without the interference of other species.
本研究介绍了一种用于检测气相农药的实用比色传感器阵列。该阵列由 6 个金属纳米粒子点在滤纸条上组成。采用 3D 折纸图案制作基于纸张的传感器，以减少纳米粒子在暴露于分析物后浸出的影响。暴露于农药气溶胶会导致由于纳米粒子的聚集而引起阵列颜色的变化。这些变化为马拉硫磷、对硫磷、毒死蜱和二嗪农等硫代农药提供了选择性响应。传感测定法还可以区分脂肪族和芳香族硫代物，并将含胺化合物与其他研究的分析物区分开来。这些发现结果通过目视检测和多元统计方法得到了明确证实。该传感器已成功开发用于在非常低的浓度下定量测量农药气溶胶。该方法对马拉硫磷、对硫磷、毒死蜱和二嗪农的检出限分别为 58.0、103.0、81.0 和 117.0。此外，该阵列可用于同时分析四种研究中的农药。统计结果证实，该方法在没有其他物质干扰的情况下，对作为主要空气污染物的硫代物具有高的同时检测性能。
