Dissipation pattern and residual levels of boscalid in cucumber and soil using liquid chromatography-tandem mass spectrometry. Issue 4 (2nd April 2020)

• Record Type: Journal Article
• Authors: He, Yahui; Meng, Man; Yohannes, Woldemariam Kalekristos; Khan, Majid; Wang, Mengqiang; Abd EI-Aty, A. M.; Hacımüftüoğlu, Fazil; He, Yongjuan; Gao, Liping; She, Yongxin
• Is Part Of: Journal of environmental science and health. Volume 55:Issue 4(2020)
• Page Start: 388
• Page End: 395
• Publication Date: 2020-04-02
• Subjects: Boscalid -- residue -- cucumber -- soil -- HPLC-MS/MS -- degradation kinetics; Pesticides -- Environmental aspects -- Periodicals; Food contamination -- Periodicals; Agricultural wastes -- Environmental aspects -- Periodicals; Ecology -- periodicals; Pesticides -- toxicity -- periodicals; Food Contamination -- periodicals; 363.73
• DOI: 10.1080/03601234.2019.1706374
• Languages: English
• ISSNs: 0360-1234

Abstract

Abstract: 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.