气质多反应监测在西宁市果蔬农残检测中的应用OA

A method for pretreating and detecting pesticide residues in vegetables and fruits acquired from Xining City was established by leveraging matrix solid-phase dispersion(MSPD)combined with gas chromatography-tandem mass spectrometry(GC-MS/MS)in the multiple reaction monitoring(MRM)mode.The applicability,practicality,and reliability of this combined technique were evaluated,with the ultimate objective of enhancing the quality and safety supervision of agricultural products.Common vegetable and fruit samples(including leafy,root,stem,and berry types)were collected from major farmers' markets and supermarkets across the five districts and two counties of Xining.After MSPD treatment,the extracts were analyzed using GC-MS/MS in the MRM mode to determine the levels of 13 pesticide residues.The detection range was 0～5 mg/kg.The proposed method demonstrated good linearity,with correlation coefficients between 0.9983 and 0.9996.The limits of detection ranged from 0.003 to 0.050 μg/kg,and the limits of quantification ranged from 0.009 to 0.15 μg/kg.At spiked concentrations of 50 and 100 μg/L,the recovery rates were 82.88%～96.74%and 81.27%～97.72%.The corresponding precision values,expressed as relative standard deviations,were 1.24%～4.72%and 3.05%～6.92%.The MSPD technique simplifies sample preparation,reduces organic solvent consumption,and lowers environmental impact and cost.The GC-MS/MS method in the MRM mode offers high specificity,eliminates matrix interference,and improves sensitivity and accuracy.Overall,this combined approach demonstrates significant advantages for large-scale screening of pesticide residues in fruits and vegetables in Xining.It offers enhanced detection efficiency and reliable results,providing strong technical support for ensuring the quality and safety supervision of local agricultural products.