Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou 310029, China.
J Hazard Mater. 2013 Aug 15;258-259:151-8. doi: 10.1016/j.jhazmat.2013.04.040. Epub 2013 May 2.
Pyribambenz propyl, or ZJ0273, is a new and widely used pyrimidynyloxybenzoic herbicide; however, its behavior and safety in anaerobic soils remain poorly understood. In this study, ZJ0273 was labeled with (14)C on its benzoate-, pyrimidyl- and benzyl- rings respectively, and applied to anoxic flooding soils to characterize its anaerobic fates. Over the 100 d incubation, the amended (14)C-ZJ0273 was slightly mineralized to (14)CO2 (<4%) or redistributed into the overlaying water (<10%), with the majority of the (14)C (82-98%) remaining in the soil. The residues in soil underwent a gradual transformation from extractable residues (ER) to bound residues (BR), with the percentage of (14)C-BR increasing from 1.1 to 2.5% at day 5 to 23.2-47.2% at day 100. The proportion of (14)C-ER, (14)C-BR and (14)CO2 depended both on the soil property and the labeling position. Generally, ZJ0273 has the highest tendency to form BR in fluvio-marine yellow loamy soil, and the mineralization on both the benzoate and benzyl rings tends to be more extensive in red-clayed soil than the other soils. The ring-specific labeling (14)C on three aromatic rings respectively provides full molecular information and yield information on sub-molecular level, i.e., the benzoate ring was generally more susceptible to cleavage than the pyrimidyl or benzyl rings (P<0.01).
吡唑并嘧啶氧基苯甲酸丙酯，或 ZJ0273，是一种新型且广泛使用的嘧啶氧基苯甲酸类除草剂；然而，其在厌氧土壤中的行为和安全性仍知之甚少。在本研究中，分别在苯甲酸、嘧啶基和苄基环上用 (14)C 标记 ZJ0273，并将其应用于缺氧淹没土壤中以表征其厌氧命运。在 100 d 的孵育期内，添加的 (14)C-ZJ0273 轻微矿化为 (14)CO2（<4%）或重新分配到上层水中（<10%），大部分 (14)C（82-98%）仍留在土壤中。土壤中的残留物经历了从可提取残留物（ER）到结合残留物（BR）的逐渐转化，在第 5 天到第 100 天，(14)C-BR 的比例从 1.1%增加到 2.5%到 23.2-47.2%。(14)C-ER、(14)C-BR 和 (14)CO2 的比例既取决于土壤性质，也取决于标记位置。通常，ZJ0273 在河流-海洋黄壤中形成 BR 的趋势最高，苯甲酸和苄基环的矿化在红粘土中比在其他土壤中更为广泛。三个芳环上的特定环标记 (14)C 分别在亚分子水平上提供了完整的分子信息和产率信息，即苯甲酸环通常比嘧啶基或苄基环更容易断裂（P<0.01）。
