Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (29): 132-138.doi: 10.11924/j.issn.1000-6850.casb19010113

Special Issue: 植物保护 园艺

Previous Articles     Next Articles

Determination of 5 Kinds of Pesticide Residues in Tea by HPLC

Ding Yi1,2(), Li Rongyu1,2,3(), Liu Shijiang1,2, Zhao Qijun1,2   

  1. 1Institute of Crop Protection, Guizhou University, Guiyang 550025
    2 College of Agriculture, Guizhou University, Guiyang 550025
    3 The Provincial Key Laboratory for Agricultural Pest Management in Mountainous Region, Guiyang 550025
  • Received:2019-01-22 Revised:2019-04-24 Online:2020-10-15 Published:2020-10-16
  • Contact: Li Rongyu E-mail:761328742@qq.com;lirongyu0328@126.com

Abstract:

To provide technical support for green tea production, HPLC method for determining 5 kinds of pesticide residues in tea samples was established. After soaking in water, the samples were extracted by V (n-hexane): V(acetone)=5:1, then extracted by ethylacetate, purified by floriferous silica and activated carbon column. High performance liquid chromatography (HPLC) was used to determine the pesticides of lambda-cyhalothrin, cypermethrin, bifenthrin, thiamethoxam and imidacloprid in the samples. The results showed that there was a good linear relationship between the chromatographic peak area and the concentration of the 5 pesticides in the range of 0.1-10.0 mg/L. The correlation coefficients were higher than 0.9994. The average recovery rate at three spiked levels of 0.1, 0.5 and 1 mg/L ranged from 85% to 95%, with the relative standard deviation (RSDs) from 0.55% to 2.5% in the blank tea samples. The method could meet the requirements of pesticide residue analysis test and has a high sensitivity.

Key words: tea, HPLC, pesticide residue, pesticide residue analysis method, green production

CLC Number: