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| Analysis of Residual Profiles of Bifenthrin and Acetamiprid in Tea Garden by QuEChERS-PSA-GC |
| Received:April 20, 2015 |
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| KeyWord:bifenthrin;acetamiprid;tea;dissipation dynamics;QuEChERS-PSA;GC |
| Author Name | Affiliation | E-mail | | WEI Peng | Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310029, China | | | CAO Meng-chao | Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310029, China | | | WANG Quan-sheng | Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310029, China | | | LIU Ya-nan | Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310029, China | | | WANG Meng-cen | Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310029, China | wmctz@zju.edu.cn | | ZHU Guo-nian | Institute of Pesticide and Environmental Toxicology, Zhejiang University, Hangzhou 310029, China | |
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| Abstract: |
| In this work, a method for determination of bifenthrin and acetamiprid in tea and soil using QuEChERS-PSA and GC-ECD(gas chromatography-electron capture detector) was developed, and the residual profiles of 4.5% bifenthrin-acetamiprid microemulsionin(ME)in tea garden were then investigated. Under the optimized conditions of GC-ECD, a good linearity(r=0.997 5~0.998 9) for standard solutions over the concentration range of 0.01~1 mg·kg-1 was obtained with the limit of detection(LOD) of 2.0×10-11 g. The average recoveries of tea and soils fortified with three levels from 0.01 mg·kg-1 to 1 mg·kg-1 bifenthrin and acetamprid ranged from 89.2% to 108.1%, with relative standard deviation of 2.2% to 11.3% and LOQ of 0.01 mg·kg-1, indicating that the developed method has considerable accuracy, precision and sensitivity, and is applicable for detecting the trace amounts of these pesticides in tea garden. The field trial showed that dynamics of 4.5% bifenthrin-acetamiprid ME in tea and soil fit the first-order kinetic equation, with the half-lives of bifenthrin and acetamiprid being 5.6~8.7 days and 7.9~8.6 days in tea and 8.5~13.1 days and 7.2~8.7 days in soil, respectively, suggesting that parathyroid and nitromethylene heterocyclic compounds have similar half-life and both belong to readily degradable insecticides. However, the health risks posed by these pesticides in tea need to be further evaluated in combination with various tea-processing factors and the dietary patterns in China. |
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