文献类型：期刊文献

英文题名：Assessment of the environmental fate of cycloxaprid in flooded and anaerobic soils by radioisotopic tracing

作者：Liu, Xuanqi[1];Xu, Xiaoyong[1];Li, Chao[1];Zhang, Hanxue[2];Fu, Qiuguo[2];Shao, Xusheng[1];Ye, Qingfu[2];Li, Zhong[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Chem Biol, Sch Pharm, Shanghai 200237, Peoples R China;[2]Zhejiang Univ, Inst Nucl Agr Sci, Hangzhou 310029, Zhejiang, Peoples R China

年份：2016

卷号：543

起止页码：116

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20154601554113);WOS:【SCI-EXPANDED(收录号:WOS:000367635600014)】；

基金：This work was financial supported by the Fundamental Research Funds for the Central Universities and Special Fund for Agro-scientific Research in the Public Interest (201103007). This work was also partly supported by National High Technology Research and Development Program of China (863 Program, 2011AA10A207 and 2013AA065202).

语种：英文

外文关键词：Cycloxaprid; Enantiomer; Bound residues; Mineralization; Distribution

摘要：Cycloxaprid (CYC) is a novel broad-spectrum neonicotinoid insecticide that has been developed for agricultural pest control. The fate of the C-14-labeled racemic and enantio-pure CYC isomers in flooded and anaerobic soil was investigated using radioisotope tracing techniques. After 100 d of incubation, only a minor portion (<1%) of the applied CYC isomers is mineralized by each of the four tested soil types. The fraction of initially applied radioactive CYC dissipated into the bound or non-extractable residues (BR) increases with increase in the length of the incubation period, reaching up to 53.0-81.6%. The dissipation of the CYC through mineralization or formation of BR is strongly influenced by soil properties, such as humic content, pH value, and retained microbial activity. Amongst the soils studied, the fluvio-marine yellow loamy soil displayed the highest tendency to mineralize CYC while the coastal saline soil exhibited the strongest tendency to form BR. The observation that the water phase retained the large portion(>60%) of the radioactivity attributed to the total extractable residue suggested that under the experimental condition, the initially applied C-14-labeled CYC residues were readily available for leaching or offsite transport. Additionally, no enantiomer-specific behaviors are observed. The results from this study provide a framework for assessing the environmental impact resulting from the use of this pesticide. (C) 2015 Published by Elsevier B.V.