Wang Haiyan, Ye Qingfu, Yue Ling, Yu Zhiyang, Han Ailiang, Yang Zhengmin, Lu Long
Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou, China.
Chemosphere. 2009 Aug;76(8):1036-40. doi: 10.1016/j.chemosphere.2009.04.051. Epub 2009 May 29.
ZJ0273, propyl 4-(2-(4,6-dimethoxypyrimidin-2-yloxy)benzylamino)benzoate, is a broad-spectrum herbicide being marketed for use on rape crops. However, environmental behavior and fate of ZJ0273 remained poorly understood. In this study, we used ZJ0273 labelled with (14)C on the C ring to understand the transformation of ZJ0273 in aerobic soils. Results showed a first-order dissipation pattern for the parent compound, with half-lives ranging from 17.2 to 53.7 d, suggesting a short to moderate persistence. The dissipation of the parent molecule was accompanied by formation of bound residues and mineralization. The transformation of ZJ0273 appeared to decrease with decreasing soil pH and organic matter content. Differences were often observed in the formation of bound residues, and mineralization among different soils. After 100 d of incubation, the total bound residue accounted for 17.4-28.8% of the total applied amount in the three soils, while cumulative mineralization to CO(2) reached 1.2% for an acidic soil, 7.7% for neutral and 9.9% for alkaline soil, suggesting that the herbicide in the neutral and alkaline soils met the non-accumulative criteria as stated in the directives by the Commission of the European Communities.
ZJ0273,即4-(2-(4,6-二甲氧基嘧啶-2-基氧基)苄基氨基)苯甲酸丙酯,是一种正在市场上销售用于油菜作物的广谱除草剂。然而,ZJ0273的环境行为和归宿仍知之甚少。在本研究中,我们使用在C环上标记有(14)C的ZJ0273来了解其在好氧土壤中的转化情况。结果表明母体化合物呈现一级消散模式,半衰期在17.2至53.7天之间,表明其持久性为短期至中期。母体分子的消散伴随着结合残留物的形成和矿化作用。ZJ0273的转化似乎随着土壤pH值和有机质含量的降低而减少。在不同土壤中,结合残留物的形成和矿化作用常常存在差异。培养100天后,三种土壤中结合残留物总量占总施用量的17.4 - 28.8%,而酸性土壤中累积矿化生成CO₂的量达到1.2%,中性土壤为7.7%,碱性土壤为9.9%,这表明中性和碱性土壤中的除草剂符合欧洲共同体委员会指令中规定的非累积标准。