[噻唑基-2-(14)^C]-毒氟磷在水-沉积物系统中的降解与残留转化研究  

Study on Degradation and Residue Transformation of[thiazolyl-2-(14)^C]-Dufulin in Water-Sediment System

作　　者：吴涛[1] 张素芬[1] 张玮玮 邵思遥 余志扬[1] 叶庆富[1] WU Tao;ZHANG Sufen;ZHANG Weiwei;SHAO Siyao;YU Zhiyang;YE Qingfu(Institute of Nuclear-Agricultural Science/Key Laboratory for Nuclear Agricultural Sciences of Chinese Ministry of Agriculture and Rural Affairs,PRC and Zhejiang Province,Zhejiang University,Hangzhou,Zhejiang 310058)

机构地区：[1]浙江大学原子核农业科学研究所/农业农村部和浙江省核农学重点实验室,浙江杭州310058

出　　处：《核农学报》2022年第11期2249-2257,共9页Journal of Nuclear Agricultural Sciences

基　　金：农业行业标准制定和修订项目(181821301092371030);浙江省基础公益研究计划项目(LGC20B070003)。

摘　　要：毒氟磷是我国自主创制的新型植物抗病毒剂,研究毒氟磷的环境行为和归趋对科学评价其环境风险具有重要意义。本试验采用C同位素示踪技术,以[噻唑基-2-(14)^C]-毒氟磷为示踪剂,研究了毒氟磷在A和B两种水-沉积物系统中的好氧降解动态以及残留转化规律。结果表明,毒氟磷母体在两种水-沉积物系统中的水相消散和降解均符合一级动力学模型,其水相消散半减期分别为7.23 d(A)和13.86 d(B),在水-沉积物整个系统中的母体降解半减期则分别为121.60 d(A)和65.39 d(B)。毒氟磷在供试水-沉积物系统中的残留转化规律存在显著差异,培养结束时(培养时间为100 d),可提态残留在A和B系统中分别占放射性引入量的77.41%和43.71%,矿化量分别占放射性引入量的1.11%和2.83%,结合态残留分别占放射性引入量的24.11%和49.25%;较高的降解率和阳离子交换量是毒氟磷及其代谢产物在B系统中更易形成结合残留的主要原因。本研究结果为科学评价毒氟磷在水-沉积物系统中的安全性提供了基础数据和科学依据。Dufulin is a novel plant antiviral agent independently created in China.It is of great significance to study the environmental behavior and fate of Dufulin for scientific evaluation of its environmental risks.The degradation dynamics and residue transformation of Dufulin were studied in two water-sediment systems(A and B)under aerobic condition using[thiazyl-2-(14)^C]-Dufulin as a tracer combined withC isotope tracer technology.The results were as follows:the water phase dissipation and degradation of Dufulin in the two tested water-sediment systems follow a single first order,with water phase dissipation half-lives of 7.23 d(A)and 13.86 d(B),respectively,while parent degradation half-lives were 121.60 d(A)and 65.39 d(B).There were significant differences in the residual transformation of Dufulin in the tested water-sediment systems.At the end of the cultivation(DAT=100 d),the extractable residues in the A and B systems were 77.41%and 43.71%of applied amount,the mineralization was 1.11%and 2.83%of applied amount,and the bound residues were 24.11%and 49.25%,respectively.Dufulin and its metabolites were more likely to bind with the sediments in B system as the result of higher degradation rate and the cationic exchange capability.The findings of the study give fundamental facts for a scientific evaluation of Dufulin’s safety in water-sediment systems.

关 键 词：[噻唑基-2-(14)^C]-毒氟磷 水-沉积物系统 降解 残留转化 结合残留 

分 类 号：X592[环境科学与工程—环境工程]