Abstract
Dissipation behaviour of the chloronicotinyl insecticide, imidacloprid (Tatamida 17.8 % SL), in fresh and cured cardamom capsules was studied following application at doses 20 and 40 g a.i. ha−1 in a cardamom plantation of Indian Cardamom Hills (ICH), Idukki, Kerala, India. A single-laboratory ultra performance liquid chromatography mass spectrometry (UPLC–MS/MS) method was developed and validated for the estimation of imidacloprid and its six metabolites (5-hydroxy, olefin, guanidine, urea, 6-chloronicotinic acid and nitrosimine) in fresh and cured cardamom. At the lower dose, the initial deposits of total imidacloprid residues were 1.91 and 7.23 μg g−1, respectively, in fresh and cured cardamom. At the higher dose, the initial residues were 3.94 and 14.72 μg g−1, respectively, in fresh and cured capsules. The residues dissipated below the quantitation level of 0.01 μg g−1 after 21 and 28 days at lower dose and after 28 days for both at higher dose. The half-lives of imidacloprid in fresh and cured cardamom were 4.02 and 3.63 days, respectively, at lower dose and 3.61 days for both at higher dose. The waiting periods of imidacloprid on fresh and cured cardamom at lower and higher doses were 21.40, 27.10, 23.85 and 30.70 days, respectively. The mean processing factor of imidacloprid was 3.96 at 20 g a.i. ha−1. Amongst metabolites of imidacloprid, urea had maximum residues in fresh and cured cardamom followed by 5-hydroxy and guanidine. Other metabolites such as 6-chloronicotinic acid, olefin and nitrosimine were not detected either in fresh or cured cardamom.
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The first author wishes to express his gratitude to the Manonmaniam Sundaranar University, Tirunelveli, Scott Christian College, Nagercoil and Pesticide Residue Research and Analytical Laboratory, KAU, Vellayani, for providing necessary research facilities for the conduct of the study.
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Pratheeshkumar, N., Chandran, M., Beevi, S.N. et al. Dissipation kinetics and effect of processing on imidacloprid and its metabolites in cardamom (Elettaria cardamomum Maton). Environ Monit Assess 188, 53 (2016). https://doi.org/10.1007/s10661-015-5058-5
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DOI: https://doi.org/10.1007/s10661-015-5058-5