关键词: 烯酰吗啉, 霜脲氰, 唑嘧菌胺, 蔬菜, 超高效液相色谱-串联质谱

Abstract: In order to establish an analytical method for simultaneous detection of dimethomorph, cymoxanil and ametoctradin residues in vegetables, the samples were extracted with acetonitrile, purified by octadecylsilane (C18) dispersed solid phase extraction, separated by HSS T3 chromatographic column, gradient eluted with methanol and 0.1% formic acid water as mobile phase, detected by positive and negative ion segmented scanning and multi-reaction detection mode (MRM), and quantified by matrix matching standard solution external standard method. The results showed that dimethomorph, cymoxanil and ametoctradin had good linear relationships in the range of 0.001~1.000 μg·mL^-1, and the correlation coefficients were all greater than 0.999. The quantitative limit of the target substance in vegetables was 0.005 mg·kg^-1. In sample addition recovery test, the average recovery rates of dimethomorph were 87.3%~105.6%, and the relative standard deviations were 1.5%~11% (n=5). The average recovery rates of cymoxanil were 85.4%~113.4% (n = 5), and the relative standard deviations were 0.5%~10.9% (n=5). The average recovery rates of ametoctradin were 80.9%~108.4%, and the relative standard deviations were 2.8%~10.2% (n=5). The present method was rapid, simple and accurate, and it met the requirements of residue detection of dimethomorph, cymoxanil and ametoctradin in various vegetables.

Key words: dimethomorph, cymoxanil, ametoctradin, vegetable, UPLC-MS/MS