Fang Cao, Wang Shenhao, Shao Changsheng, Liu Chao, Wu Yahui, Huang Qing
CAS Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Anhui Key Laboratory of Environmental Toxicology and Pollution Control Technology, Hefei Institute of Intelligent Agriculture, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China; Science Island Branch of Graduate School, University of Science & Technology of China, Hefei, China.
High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.
Chemosphere. 2022 Nov;307(Pt 1):135620. doi: 10.1016/j.chemosphere.2022.135620. Epub 2022 Jul 12.
Methyl parathion (MP) as an organophosphorus pesticide has been used in the control of agricultural pests and diseases. Due to its high toxicity and persistence in the environment, MP may pose threat to human health when it is released into environmental water. For MP treatment, people have found that oxidative degradation of MP may generate some intermediates which are more toxic than MP itself, such as methyl paraoxon. Herein, we proposed a new method of applying dielectric barrier discharge (DBD) non-thermal plasma technology to treat MP in aqueous solution, and investigated the influences of different gases, pH value, discharge voltage/power, and main active species on the MP removal efficiency. In particular, the safety of DBD treatment was concerned with analysis of the biological toxicity of the byproducts from the DBD oxidation, and the DBD-induced degradation together with the involved mechanism was explored therein. The results showed that the production of toxic intermediates could be effectively suppressed or avoided under certain treatment conditions. As such, this work demonstrates that the proper application of DBD plasma technology with necessary caution can detoxify methyl parathion effectively, and also provides a practical guide for low-temperature plasma application in treatment of various organophosphorus pesticides in agricultural wastewater.
甲基对硫磷（MP）作为一种有机磷农药，已被用于防治农业病虫害。由于其高毒性和在环境中的持久性，MP释放到环境水体中时可能对人类健康构成威胁。对于MP的处理，人们发现MP的氧化降解可能会产生一些比MP本身毒性更大的中间体，如对氧磷。在此，我们提出了一种应用介质阻挡放电（DBD）非热等离子体技术处理水溶液中MP的新方法，并研究了不同气体、pH值、放电电压/功率以及主要活性物种对MP去除效率的影响。特别地，通过分析DBD氧化副产物的生物毒性来关注DBD处理的安全性，并在此探讨DBD诱导的降解及其相关机制。结果表明，在一定处理条件下可有效抑制或避免有毒中间体的产生。因此，这项工作表明，谨慎适当地应用DBD等离子体技术可以有效降解甲基对硫磷，也为低温等离子体在处理农业废水中各种有机磷农药的应用提供了实用指导。
