Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou 310029, China.
J Agric Food Chem. 2010 Mar 10;58(5):3062-7. doi: 10.1021/jf904105b.
A novel pyrimidynyloxybenzoic herbicide (ZJ0273) uniformly labeled with (14)C on the benzoate ring was applied to soils under sterile and nonsterile conditions to understand the effect of soil microorganisms and selected properties on its dissipation and transformations to bound resides and (14)CO(2). A significant effect of soil microorganisms was found in an acidic soil, where sterilization significantly prolonged the half-dissipation time (DT(50)) of ZJ0273 from 15.57 to 34.31 days and decreased the total amount of mineralized (14)CO(2) from 19.91 to 0.43%. However, sterilization showed limited effect on the patterns of bound residue or extractable residue levels in soils having pH > or = 6.1. In addition, a significant suppression of high pH was found on the dissipation of extractable residues and formation of bound residues. The enhancement of bound residue formation by low soil pH was attributed to increased conversion of ZJ0273 to its intermediates, which were rapidly bound to soil organic matter.
一种新型嘧啶氧基苯甲酸类除草剂（ZJ0273），其苯环上均匀标记了（14）C，用于无菌和非无菌条件下的土壤中，以了解土壤微生物和选择特性对其消解和转化为结合残留和（14）CO2的影响。在酸性土壤中发现了土壤微生物的显著影响，其中灭菌显著延长了 ZJ0273 的半衰期（DT（50））从 15.57 天延长到 34.31 天，并将矿化（14）CO2的总量从 19.91%降低到 0.43%。然而，灭菌对 pH 值>或=6.1 的土壤中结合残留或可提取残留水平的模式影响有限。此外，高 pH 值对可提取残留的消解和结合残留的形成有显著的抑制作用。低土壤 pH 值促进结合残留形成归因于 ZJ0273 向其中间产物的转化率增加，这些中间产物迅速与土壤有机质结合。
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