Dynamics of pesticide residues in the autumn Chinese cabbage (Brassica chinensis L.) grown in open fields

Pest Management Science
Zhi-Yong ZhangXiao-Yue Hong

Abstract

Residues of the pesticides chlorpyrifos, dimethoate, cyhalothrin, cypermethrin, fenvalerate, deltamethrin and chlorothalonil in the autumn Chinese cabbage (Brassica chinensis L.) were studied using gas chromatography. The results indicated that the residues were dependent on the frequency and rate of pesticide application and on the weather conditions immediately following spraying. When the Chinese cabbages were treated once at normal rates, the half-lives of the seven pesticides in the vegetable were 4.7, 5.3, 2.9, 3.5, 5.4, 4.3 and 4.0 days respectively. Thus, based on the recommended preharvest intervals, the residual levels of all pesticides were within the national standards. When the Chinese cabbages were treated four times at maximal rates at 5 day intervals, the half-lives of chlorpyrifos, cypermethrin and chlorothalonil in the vegetable were 3.6, 2.9 and 5.9 days respectively, so that, based on the recommended preharvest intervals, the residual levels of chlorpyrifos and chlorothalonil exceeded the national standards for pollution-free vegetables, but the residual level of cypermethrin was within the national standard. Effects of rain on pesticide final residues in plants treated four times were more significant than ...Continue Reading

References

Jul 1, 2004·Journal of Environmental Quality·Qingli MaDon E McNaughton

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Citations

Apr 13, 2013·Food Chemistry·Farag MalhatAbd El-Salam Fayz
Sep 12, 2015·Journal of Environmental Sciences (China)·Yan FuGuonian Zhu
Oct 6, 2016·Environmental Science and Pollution Research International·P W ZhangZ X Zhang
Mar 30, 2017·Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment·František KocourekJana Hajšlová
Jul 11, 2020·Journal of the Science of Food and Agriculture·Laixin CongWenjing Yan
Apr 17, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Yi LuFei Liu
Apr 2, 2014·Journal of Agricultural and Food Chemistry·Miao-Fan ChenHsiu-Pao Chien

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