Determination of pyriminobac-methyl and bispyribac-sodium residues in rice by liquid chromatography-tandem mass spectrometry based on QuEChERS

doi:10.3724/SP.J.1123.2017.02032

Abstract

Abstract:

A method was developed for the determination of pyriminobac-methyl and bispyribac-sodium residues in rice by liquid chromatography-tandem mass spectrometry (LC-MS/MS) coupled with modified QuEChERS. The samples were extracted with acidified acetonitrile, and then purified by octadecylsilane bonded silica (C₁₈) adsorbents. The analytes were separated on a ZORBAX SB C₁₈ column through a gradient elution using 0.1% (v/v) aqueous formic acid aqueous containing 5 mmol/L ammonium acetate and acetonitrile as mobile phases. Positive electrospray ionization (ESI⁺) was used. Qualitative work was performed using selected dynamic multiple reaction monitoring (dynamic MRM) mode. Quantization was performed using external standard method. The results showed good linearities of pyriminobac-methyl and bispyribac-sodium with correlation coefficients (r²) not less than 0.996. The limits of detection (LODs) of the method were 0.8 μ g/kg for pyriminobac-methyl, and 3 μ g/kg for bispyribac-sodium. The mean spiked recoveries of pyriminobac-methyl and bispyribac-sodium at three spiked levels were 76.6%-85.6% and 73.0%-86.7%, respectively, and the relative standard deviations (RSDs) of pyriminobac-methyl and bispyribac-sodium were 0.9%-3.4% and 1.2%-5.5%, respectively. This method is simple, rapid, sensitive, and suitable for the simultaneous determination of pyriminobac-methyl and bispyribac-sodium in rice.

Key words: bispyribac-sodium, liquid chromatography-tandem mass spectrometry (LC-MS/MS), pyriminobac-methyl, QuEChERS, rice

CLC Number:

O658

QIN Meiling, CHAI Shuangshuang, MA Youning, GAO Huanhuan, ZHANG Hantong, HE Qiao. Determination of pyriminobac-methyl and bispyribac-sodium residues in rice by liquid chromatography-tandem mass spectrometry based on QuEChERS[J]. Chinese Journal of Chromatography, 2017, 35(7): 719-723.

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