Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 55, Issue 4, Pages 388-395Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2019.1706374
Keywords
Boscalid; residue; cucumber; soil; HPLC-MS; MS; degradation kinetics
Funding
- National Natural Science Foundation of China [31772071]
- Beijing Excellent Talents Funding for Youth Scientist Innovation Team [2016000026833TD01]
- High-level Teachers in Beijing Municipal Universities [IDHT20180506]
- Guangxi Innovation-driven Development Project [AA17204043-2]
- China Agriculture Research System [CARS-05-05A-03]
- Central Public-interest Scientific Institution Basal Research Fund [1610072016009]
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To stipulate the rationale of spraying doses and to determine the safe interval period of boscalid suspension concentrate (SC), the degradation dynamics and residual levels were investigated in cucumber and soil using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Field trials were conducted according to Chinese Guideline on pesticide residue trials. Following application, the degradation kinetics was best ascribed to first-order kinetic models with half-life of 2.67-9.90 d in cucumber. Spraying boscalid SC at 1.5-fold the recommended dosage yield terminal residues, which are clearly lower than the maximum residue limit (MRL) established by China (MRL =5 mg.kg(-1)) in cucumber. At variance, the dissipation dynamics in soil did not fit to first-order kinetics and the half-life was more than 17 days, the finding which denotes that the degradation behavior of boscalid in soil proceeds slowly. It has therefore been shown that boscalid is safe for use on cucumbers under the recommended dosage.
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