Pesticide residues are harmful to the environment and human and animal health even at low levels because of long-term bioaccumulation. In this study, photolysis was applied to treat three representative water samples: aqueous atrazine and dimethoate solutions as target pesticides, as well as wastewater and agriculture wastewater containing pesticide residue. It was performed using ultraviolet (UV) irradiation at two wavelengths (254 and 306 nm) with exposure times ranging from 2 to 12 h in the presence and absence of a photocatalyst to identify the optimal degradation conditions. Extraction and analyzation process were performed by the Quick Easy Cheap Effective Rugged Safe (QuEChERS) methods and gas chromatography–tandem mass spectrometry with triple quadrupole detector (GC–MSMS/TQD), respectively. Photodegradation increased with an increase in exposure time and the TiO2 catalyst was beneficial for degradation. Both selected irradiation wavelengths were effective, although the wavelength of λ = 306 nm was the most efficient.

中文翻译：

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光解和TiO2对废水中农药降解的影响

由于长期的生物蓄积，农药残留即使在低含量下也对环境和人类及动物健康有害。在这项研究中，光解法用于处理三种代表性的水样品：阿特拉津水溶液和乐果溶液作为目标农药，以及废水和含有农药残留的农业废水。在存在和不存在光催化剂的情况下，使用紫外线（UV）照射两种波长（254和306 nm），曝光时间范围为2至12 h，以确定最佳降解条件。萃取和分析过程分别通过快速简便，廉价，有效，耐用的安全（QuEChERS）方法和带有三重四极杆检测器（GC-MSMS / TQD）的气相色谱-串联质谱法进行。光降解随着暴露时间的增加而增加，TiO2催化剂有利于降解。尽管λ= 306 nm的波长是最有效的，但两个选定的照射波长都是有效的。