›› 2018, Vol. 30 ›› Issue (8): 1376-1381.DOI: 10.3969/j.issn.1004-1524.2018.08.15

• Plant Protection • Previous Articles     Next Articles

Residual degradation dynamics of lambda-cyhalothrin and cypermethrin in apple and its removal method

YU Youyi1, YANG Lu2,*, LIAO Xiang2, CHENG Ping2, WU Shengli1, LI Hong2   

  1. 1. College of Geography and Tourism, Xinjiang Normal University, Urumqi, 830054, China;
    2. Xinjiang Academy of Forestry, Urumqi 830000, China
  • Received:2017-10-16 Online:2018-08-25 Published:2018-08-28

Abstract: In the present study, laboratory simulation test and gas chromatography were used to investigate the degradation dynamics of lambda-cyhalothrin and cypermethrin in apple, and to explore suitable cleaning method for domestic application. It was shown that the residues of lambda-cyhalothrin and cypermethrin mainly remained in pericarp. Their degradation dynamics both fit the first order kinetics, and the degradation rate was faster in the early period and decreased later until stable. Under both room temperature [(25±2) ℃]and 4 ℃, the half-life of lambda-cyhalothrin and cypermethrin was the shortest in pericarp. It was feasible to remove lambda-cyhalothrin and cypermethrin by cleaning with detergent solution, salt solution, acetic acid solution, baking soda solution or tap water, but the removal efficiency varied. In order to avoid secondary pollution of detergent, it was suggested to wash apple with 10% NaCl solution to remove lambda-cyhalothrin and cypermethrin.

Key words: pesticide residue, agricultural product safety, degradation dynamics

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