Pesticide residues determination in China vegetables in 2010–2013 applying gas chromatography with mass spectrometry

Abstract The levels of multi-pesticide residues in highly consumed types of vegetables in western regions of China were investigated in this study. Vegetable samples (506) were collected from local markets from 2010 to 2013, and the concentrations of 21 types of organophosphorus (OP) and pyrethroid (PYR) pesticides from the samples were determined by gas chromatography–mass spectrometry (GC–MS). Ten OP pesticides were found in concentrations ranging from 0.0008 to 4.0544 mg/kg. Five types of PYR pesticides were determined to have concentrations in the range of 0.0009 to 6.0827 mg/kg. There were no residues in 69.76% of the samples. A portion (25.49%) of the samples contained pesticide residues less than or equal to the maximum residue limits (MRLs), and 4.94% of samples contained pesticide residues greater than their MRLs. This study provides useful information on the current contamination status of a key agricultural area in China from 2010 to 2013 and highlights the need for regular monitoring of pesticide residues in a greater number of vegetable samples and for longer periods, especially in leafy vegetables, to protect consumers.