Research Group in Advanced Oxidation Processes (AdOx), Department of Chemical Engineering, Escola Politécnica, University of São Paulo, Av. Prof. Luciano Gualberto, 380, CEP 05508-010, São Paulo, SP, Brazil.
Environ Sci Pollut Res Int. 2021 May;28(19):24191-24205. doi: 10.1007/s11356-021-13387-7. Epub 2021 Mar 16.
The degradation of three pesticides, azoxystrobin (AZO), difenoconazole (DFZ), and imidacloprid (IMD), commonly found in the tomato rinse water, was studied through UVC (251-257 nm) and UVC/HO photolysis. The results showed that direct photolysis follows pseudo-first-order kinetics, with total AZO and IMD removals within 15 min, using 21.8 and 28.6 W m, respectively, while the highest percentage of DFZ degradation was 51.7% at 28.6 W m UVC. The estimated quantum yields were 0.572, 0.028, and 0.061 mol Einstein for AZO, DFZ, and IMD, respectively. With regard to UVC/HO, total pesticide removal was achieved after 10 min, while optimal treatment conditions in relation to the pesticide removal rates, estimated through the sequential Doehlert design, were about [HO] = 130 mg L and 26 W m. Cytotoxicity and genotoxicity assays carried out with Allium cepa, for real industrial tomato rinse water sampled from washing belts did not show abnormalities during cell division, with total pesticides degradation after 15 min, demonstrating the potential application of the UVC/HO process as a viable localized treatment with a focus on the possible reuse of treated water.
研究了番茄冲洗水中常见的三种农药（唑菌胺酯（AZO）、咯菌腈（DFZ）和吡虫啉（IMD））在 UVC（251-257nm）和 UVC/HO 光解下的降解情况。结果表明，直接光解符合假一级动力学，在 15 分钟内，使用 21.8 和 28.6 W m 时，总 AZO 和 IMD 去除率分别为 21.8 和 28.6 W m，而 DFZ 的最高降解率为 51.7%，在 28.6 W m 的 UVC 下。估计的量子产率分别为 0.572、0.028 和 0.061 mol Einstein 用于 AZO、DFZ 和 IMD。对于 UVC/HO，在 10 分钟内实现了总农药去除，而通过顺序 Doehlert 设计估算的与农药去除率相关的最佳处理条件约为[HO]=130mg L 和 26 W m。用洋葱进行的细胞毒性和遗传毒性试验，对从清洗带上采集的实际工业番茄冲洗水进行了研究，在细胞分裂过程中没有显示出异常，在 15 分钟后总农药降解，表明 UVC/HO 工艺作为一种可行的局部处理具有潜在的应用，重点是可能对处理后的水进行再利用。
