Uncertainty Evaluation for Determination of Neonicotinoid Pesticide Residues in Vegetables by Liquid Chromatography Tandem Mass Spectrometry
To evaluate the uncertainty of liquid chromatography tandem mass spectrometry for the determination of neonicotinoid pesticides in vegetables,the improved QuEChERS high-performance liquid chromatography tandem mass spectrometry method was used to measure the content of three neonicotinoid pesticides(thiamethoxam,imidacloprid,and acetamiprid)in lettuce leaves,and a mathematical model was established to analyze the sources of uncertainty and quantify them.The results showed that when the mass fractions of thiamethoxam,imidacloprid,and acetamiprid in vegetables were 0.047,0.054,0.051 mg/kg,respectively,the standard synthetic uncertainties were 0.003 4,0.004 0,0.005 1 mg/kg,and the extended uncertainties were 0.006 8,0.008 0,0.0100 mg/kg,respectively,at a 95％confidence interval(k=2).The main factors affecting the uncertainty of detection results were standard curve fitting,instrument status,repeatability,and recovery rate.We need to strictly control these aspects.This study provided a reference for the evaluation of the detection results of neonicotinoid pesticise residues in vegetables by liquid chromatography tandem mass spectrometry.
Liquid chromatography tandem mass spectrometryvegetablesneonicotinoid pesticidesuncertainty
万方数据
维普
