Residual dynamics and dietary risk assessment of 33% λ-cyhalothrin-imidacloprid suspension in citrus fruits

Authors

GONG Fangyuan, Citrus Research Institute, Academy of Agricultural Sciences, Chongqing 400712, China; Citrus Research Institute, Southwest University, Chongqing 400712, China
WANG Chengqiu, Citrus Research Institute, Academy of Agricultural Sciences, Chongqing 400712, China; Citrus Research Institute, Southwest University, Chongqing 400712, China; Laboratory of Risk Assessment for Citrus Quality and Safety, Ministry of Agriculture and Rural
JIAO Bining, Citrus Research Institute, Academy of Agricultural Sciences, Chongqing 400712, China; Citrus Research Institute, Southwest University, Chongqing 400712, China; Laboratory of Risk Assessment for Citrus Quality and Safety, Ministry of Agriculture and Rural
ZHANG Yaohai, Citrus Research Institute, Academy of Agricultural Sciences, Chongqing 400712, China; Citrus Research Institute, Southwest University, Chongqing 400712, China; Laboratory of Risk Assessment for Citrus Quality and Safety, Ministry of Agriculture and Rural
ZHAO Qiyang, Citrus Research Institute, Academy of Agricultural Sciences, Chongqing 400712, China; Citrus Research Institute, Southwest University, Chongqing 400712, China; Laboratory of Risk Assessment for Citrus Quality and Safety, Ministry of Agriculture and Rural
AN Jiao, Citrus Research Institute, Academy of Agricultural Sciences, Chongqing 400712, China; Citrus Research Institute, Southwest University, Chongqing 400712, China

Abstract

In this study, QuEChERS technology combined with UPLC-MS/MS was used to detect the active ingredients of 33% λ-cyhalothrin-imidacloprid suspension in citrus. Residue and degradation dynamics of the compound in citrus field residue test was studied for the first time. The residual digestion of λ-cyhalothrin and imidacloprid on whole fruit of citrus accorded with the first-order kinetic relationship, and correlation coefficient was 0.956 0～0.992 3. The half-lives of imidacloprid are 5.5～7.6 d while λ-cyhalothrin are 8.2～9.8 d, final degradation rate is above 92%. The terminal residues indicated that the amounts of final residues was positively correlated with the dosage, the number of application and the interval of harvesting. The residues of the two were mainly distributed in peel, followed by whole fruit and pulp. About 28 days later after the last application, the residues of imidacloprid and λ-cyhalothrin in fruits was lower than the MRL value specified in GB 2763—2016, and dietary risk assessment showed that risks of residues were acceptabled. Therefore, it is recommended that 33% imidacloprid-λ-cyhalothrin suspension should be applied in 1 000-fold dilution (330 mg/kg) and can be applied up to 2 times in one citrus production cycle with 10-days application interval and 28-days harvest interval.

Publication Date

5-28-2019

First Page

101

Last Page

106

DOI

10.13652/j.issn.1003-5788.2019.05.018

Recommended Citation

Fangyuan, GONG; Chengqiu, WANG; Bining, JIAO; Yaohai, ZHANG; Qiyang, ZHAO; and Jiao, AN (2019) "Residual dynamics and dietary risk assessment of 33% λ-cyhalothrin-imidacloprid suspension in citrus fruits," Food and Machinery: Vol. 35: Iss. 5, Article 18.
DOI: 10.13652/j.issn.1003-5788.2019.05.018
Available at: https://www.ifoodmm.cn/journal/vol35/iss5/18

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