Dissipation pattern and residual levels of boscalid in cucumber and soil using liquid chromatography-tandem mass spectrometry |
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| Authors: | Yahui He Man Meng Woldemariam Kalekristos Yohannes Majid Khan Mengqiang Wang A M Abd EI-Aty |
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| Institution: | 1. China-Canada Joint Lab of Food Nutrition and Health (Beijing), Beijing Technology &2. Business University, Beijing, P.R. China;3. hyh@btbu.edu.cn sheyongxin@caas.cn;5. Institute of Quality Standards &6. Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing, P.R. China;7. State Key Laboratory of Biobased Material and Green Papermaking, College of Food Science and Engineering, Qilu University of Technology, Shandong Academy of Science, Jinan, China;8. Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt |
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| Abstract: | AbstractTo 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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| Keywords: | Boscalid residue cucumber soil HPLC-MS/MS degradation kinetics |
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