Food Safety and Hygiene Research Division, Korea Food Research Institute, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea.
Department of Food Biotechnology, University of Science and Technology, Daejeon, 305-350, Republic of Korea.
Environ Sci Pollut Res Int. 2021 Feb;28(7):8296-8309. doi: 10.1007/s11356-020-11127-x. Epub 2020 Oct 14.
Pesticides are emergent toxins often identified in aquatic environments. In the present study, microplasma was employed to reduce the pesticide content in water. The degradation efficacy, rate, and pathways of standard organophosphorus pesticides (namely, chlorpyrifos, chlorpyrifos oxone, and diazinone) and an organochlorine pesticide (namely, DDT solution) were evaluated using microplasma. High-performance liquid chromatography (HPLC) analysis was performed to elucidate the degradation efficiency of pesticides as a function of plasma-produced substances that originally contributed to the main reduction procedure. Microplasma produces several types of radicals or reactive substances, for instance dissolved ozone (O), nitrogen oxides, hydroxyl radicals (OH radicals), and hydrogen peroxide (HO). The removal potential differs due to the existence or absence of varieties of plasma-produced substances. The functions of major plasma-produced species on pesticide removal were determined by a passive technique. Nitrogen oxides showed a key role in organophosphorus pesticide removal, whereas dissolved ozone and OH radicals played major roles in DDT degradation. HPLC data showed that plasma-induced pesticide removal showed first-order reaction kinetics. The pesticide removal pathways through microplasma were validated by investigating the achieved data from LC-MS and GC-MS.
农药是经常在水生环境中发现的新兴毒素。在本研究中，微等离子体被用于降低水中的农药含量。使用微等离子体评估了标准有机磷农药（即毒死蜱、毒死蜱氧和二嗪酮）和一种有机氯农药（即滴滴涕溶液）的降解效果、速率和途径。高效液相色谱（HPLC）分析用于阐明农药的降解效率，作为最初有助于主要还原过程的等离子体产生物质的函数。微等离子体产生多种类型的自由基或反应性物质，例如溶解臭氧（O）、氮氧化物、羟基自由基（OH 自由基）和过氧化氢（HO）。由于存在或不存在各种等离子体产生的物质，去除的潜力不同。通过被动技术确定了主要等离子体产生物种对农药去除的作用。氮氧化物在有机磷农药去除中起着关键作用，而溶解臭氧和 OH 自由基在滴滴涕降解中起着主要作用。HPLC 数据表明，等离子体诱导的农药去除呈现一级反应动力学。通过研究从 LC-MS 和 GC-MS 获得的数据，验证了通过微等离子体的农药去除途径。
