Jiangsu Key Laboratory of Pesticide Science, College of Science, Nanjing Agricultural University, Number 1, Chemistry Building, Nanjing, 210095, China.
Environ Sci Pollut Res Int. 2014 Mar;21(6):4331-42. doi: 10.1007/s11356-013-2380-8. Epub 2013 Dec 10.
Dufulin is a newly developed antiviral agent (or pesticide) that activates systemic acquired resistance of plants. This pesticide is widely used in China to prevent abroad viral diseases in rice, tobacco and vegetables. In this study, the potential impacts such as soil type, moisture, temperature, and other factors on Dufulin degradation in soil were investigated. Degradation of Dufulin followed the first-order kinetics. The half-life values varied from 2.27 to 150.68 days. The dissipation of Dufulin was greatly affected by soil types, with DT50 (Degradation half time) varying between 17.59, 31.36, and 43.32 days for Eutric Gleysols, Cumulic Anthrosols, and Dystric Regosols, respectively. The elevated moisture accelerated the decay of Dufulin in soil. Degradation of Dufulin increased with temperature and its half-life values ranged from 16.66 to 42.79 days. Sterilization of soils and treatment with H2O2 resulted in a 6- and 8-fold decrease in degradation rates compared to the control, suggesting that Dufulin degradation was largely governed by microbial processes. Under different light spectra, the most effective degradation occurred with 100-W UV light (DT50=2.27 days), followed by 15-W UV light (DT50=8.32 days) and xenon light (DT50=14.26 days). Analysis by liquid chromatography-mass spectroscopy (LC-MS) revealed that 2-amino-4-methylbenzothiazole was one of the major decayed products of Dufulin in soils, suggesting that elimination of diethyl phosphate and 2-fluorobenzaldehyde was most like the degradation pathway of Dufulin in Eutric Gleysols.
度复林是一种新开发的抗病毒剂（或杀虫剂），能激活植物的系统获得抗性。该杀虫剂在中国广泛用于预防水稻、烟草和蔬菜的多种病毒性疾病。本研究考察了土壤类型、水分、温度等因素对度复林在土壤中降解的潜在影响。度复林的降解符合一级动力学。半衰期值在 2.27 至 150.68 天之间变化。土壤类型对度复林的消解有很大影响，其中 Eutric Gleysols、Cumulic Anthrosols 和 Dystric Regosols 的 DT50（降解半衰期）分别为 17.59、31.36 和 43.32 天。增加水分会加速土壤中度复林的衰减。度复林的降解随温度升高而增加，其半衰期值在 16.66 至 42.79 天之间变化。与对照相比，土壤灭菌和用 H2O2 处理导致降解率降低了 6 至 8 倍，表明度复林的降解主要受微生物过程控制。在不同的光谱下，100-W 紫外光（DT50=2.27 天）下的降解效果最好，其次是 15-W 紫外光（DT50=8.32 天）和氙光（DT50=14.26 天）。通过液相色谱-质谱（LC-MS）分析发现，2-氨基-4-甲基苯并噻唑是度复林在土壤中的主要降解产物之一，这表明在 Eutric Gleysols 中，二乙膦酸和 2-氟苯甲醛的消除最可能是度复林的降解途径。
