期刊
ENVIRONMENTAL POLLUTION
卷 252, 期 -, 页码 1593-1598出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.06.122
关键词
Cycloxaprid; Foliar absorption; Translocation; Stereoselective
资金
- National Natural Science Foundation of China [11675142]
Exploring traditional neonicotinoid pesticides substitutes has become one of the global scientific attentions because of their hazardous environmental impacts. Cycloxaprid (CYC) is considered to be a promising candidate alternative. But the environmental behaviors and fate of CYC in different planting system remain poorly understood. The accumulation of C-14-labeled CYC stereoisomers within different parts of Chinese cabbage (Brassica chinensis L.) was investigated, with a particular focus on the foliar absorption, translocation and stereoselectivity of CYC, during a laboratory trial. In general, the stereoisomers C-14-5R,8S-CYC and C-14-5S,8R-CYC, their metabolites, as well as the breakdown and reaction products can be transferred in both acropetal and basipetal directions. Most of the two stereoisomers absorbed by plants remained in the treated leaves, whereas a small amount was distributed to the roots. The amount of C-14 in the stalks varied among the experimental time points. At 192 h after treatment (HAT), the detected radioactivity of both C-14-5R,8S-CYC and C-14-5S,8R-CYC in the leaves above the treated leaf (LATL) was higher than that in the leaves below the treated leaf (LBTL). However, the stereoisomers of CYC underwent nonstereoselective absorption and translocation in this trial. This information implies that racemic CYC and its metabolites should be a main research focus. Thus, the obtained results provide implications for a more accurate prediction about the risk assessment of CYC, which will be helpful for guiding its rational use as well as securing the ecological environment safety and human health. (C) 2019 Elsevier Ltd. All rights reserved.
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