Residual behavior of quizalofop ethyl on onion (Allium cepa L.).

Environmental Monitoring and Assessment
S K SahooBalwinder Singh

Abstract

Quizalofop ethyl, a phenoxy propionate herbicide, is used for postemergence control of annual and perennial grass weeds in broad-leaved crops in India. The experiments were designed to study the dissipation kinetics of quizalofop ethyl on onion for two seasons. A simple, rapid, and sensitive method for estimation of quizalofop ethyl residues in onion and soil was developed and validated. The recoveries of quizalofop ethyl residues from onion and soil at different spiking level range from 84.81 to 92.68 %. The limit of quantification of this method was found to be 0.01 μg g(-1). The risk assessment through consumption of the onion in comparison to its acceptable daily intake which is an important parameter for the safety of the consumer was also evaluated. Standardized methodology supported by recovery studies was adopted to estimate residues of quizalofop ethyl on onion and soil. The average initial deposits of quizalofop ethyl on onion were observed to be 0.25 and 0.33 mg kg(-1), following single application of the herbicide at 50 g active ingredient (a.i.) ha(-1) during 2009 and 2010, respectively. The half-life values (T (1/2)) of quizalofop ethyl on onion crop were worked out to be 0.85 and 0.79 days, respectively, during 2...Continue Reading

Citations

Jun 26, 2014·PloS One·Yiran LiangZhiqiang Zhou
Nov 28, 2013·Bulletin of Environmental Contamination and Toxicology·Kousik MandalBalwinder Singh
Jul 26, 2015·Environmental Monitoring and Assessment·Paawan KaurM S Bhullar
Sep 15, 2016·Environmental Science and Pollution Research International·Ajoy SahaN K Jain
Sep 27, 2020·Bulletin of Environmental Contamination and Toxicology·Shuo WangZhongbin Lu
Jan 20, 2020·Ecotoxicology and Environmental Safety·Neha SharmaMakhan Singh Bhullar

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