Citation: WANG Lianzhu, ZHOU Yu, HUANG Xiaoyan, WANG Ruilong, LIN Zixu, CHEN Yong, WANG Dengfei, LIN Dejuan, XU Dunming. Determination of 51 carbamate pesticide residues in vegetables by liquid chromatography-tandem mass spectrometry based on optimization of QuEChERS sample preparation method[J]. Chinese Journal of Chromatography, ;2013, 31(12): 1167-1175. doi: 10.3724/SP.J.1123.2013.05051 shu

Determination of 51 carbamate pesticide residues in vegetables by liquid chromatography-tandem mass spectrometry based on optimization of QuEChERS sample preparation method

1.
1. Zhangzhou Entry-Exit Inspection and Quarantine Bureau, Zhangzhou 363100, China;

Corresponding author: WANG Lianzhu,
Received Date: 30 May 2013
Available Online: 25 July 2013
Fund Project:

The raw extracts of six vegetables (tomato, green bean, shallot, broccoli, ginger and carrot) were analyzed using gas chromatography-mass spectrometry (GC-MS) in full scan mode combined with NIST library search to confirm main matrix compounds. The effects of cleanup and adsorption mechanisms of primary secondary amine (PSA), octadecylsilane (C18) and PSA+C18 on co-extractives were studied by the weight of evaporation residue for extracts before and after cleanup. The suitability of the two versions of QuEChERS method for sample preparation was evaluated for the extraction of 51 carbamate pesticides in the six vegetables. One of the QuEChERS methods was the original un-buffered method published in 2003, and the other was AOAC Official Method 2007.01 using acetate buffer. As a result, the best effects were obtained from using the combination of C18 and PSA for extract cleanup in vegetables. The acetate-buffered version was suitable for the determination of all pesticides except dioxacarb. Un-buffered QuEChERS method gave satisfactory results for determining dioxacarb. Based on these results, the suitable QuEChERS sample preparation method and liquid chromatography-positive electrospray ionization-tandem mass spectrometry under the optimized conditions were applied to determine the 51 carbamate pesticide residues in six vegetables. The analytes were quantified by matrix-matched standard solution. The recoveries at three levels of 10, 20 and 100 μg/kg spiked in six vegetables ranged from 58.4% to 126% with the relative standard deviations of 3.3%-26%. The limits of quantification (LOQ, S/N≥10) were 0.2-10 μg/kg except that the LOQs of cartap and thiofanox were 50 μg/kg. The method is highly efficient, sensitive and suitable for monitoring the 51 carbamate pesticide residues in vegetables.
- liquid chromatography-tandem mass spectrometry (LC-MS/MS),
- gas chromatography-mass spectrometry (GC-MS),
- QuEChERS,
- evaporation residue,
- carbamate pesticide,
- vegetable
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沈阳化工大学材料科学与工程学院沈阳 110142