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Abstract
A rapid and sensitive method for the identification and quantification of quintrione residue in brown rice, rice husk, and rice straw matrices was developed and validated. Samples were extracted with acetonitrile, purified with octadecylsilane (C18) and graphitized carbon black (GCB) sorbents, and quantified using ultrahigh-performance liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS). The developed method exhibited excellent linearity (R2 ≥ 0.9988), and the limit of quantitation was 2 μg/kg in all matrices. The method also had outstanding trueness and recoveries (90.5–111.1%) at four spiked levels (2, 20, 200, and 2000 μg/kg) with intraday and interday precisions of 0.7–6.5% and 5.2–11.8%, respectively, in the three matrices. The applicability of the method was tested by determining the dissipation rate of quintrione in rice straw under field conditions, and the measured data fit the Hockey stick kinetic model with R2 values of 0.9349–0.9983. The half-lives of quintrione in rice straw ranged from 2.7 to 16.5 days. The results indicate that the method is effective and reliable for the detection of quintrione residue in rice paddy fields, and the dissipation data provide guidance for the safe application of quintrione.
Disclosure statement
The authors declare that there are no conflicts of interest regarding the publication of this article.
Compliance with ethical standards
This is an original research article that has neither been published previously nor considered presently for publication elsewhere.
Informed consent
All authors named in the manuscript are entitled to the authorship and have approved the final version of the submitted manuscript. This article does not contain any studies with human or animal subjects.