Analysis of Eight Organophosphorus Pesticide Residues in Fresh Vegetables Retailed in Agricultural Product Markets of Nanjing, China

Abstract

A method to effectively remove pigments in fresh vegetables using activated carbon followed cleanup through solid phase extraction (SPE) cartridge to further reduce matrix interference and contamination, was established to determine eight organophosphorous pesticides (OPPs) by gas chromatography (GC) with nitrogen-phosphorus detection (NPD) in this study, and it has been successfully applied for the determination of eight OPPs in various fresh vegetables with the recoveries ranging from 61.8% to 107%. To evaluate eight OPPs residue level, some fresh vegetables retailed at three agricultural product markets (APM) of Nanjing in China were detected, the results showed that phorate in Shanghai green (0.0257 microg g(-1)) and Chinese cabbage (0.0398 microg g(-1)), dimethoate in Shanghai green (0.0466-0.0810 microg g(-1)), Chinese cabbage (0.077 microg g(-1)), and spinach (0.118-0.124 microg g(-1)), methyl-parathion in Shanghai green (0.0903 microg g(-1)), Chinese cabbage (0.157 microg g(-1)), and spinach (0.0924 microg g(-1)), malathion in Shanghai green (0.0342-0.0526 microg g(-1)), chorpyrifos in spinach (0.106-0.204 microg g(-1)), and Chinese cabbage (0.149 microg g(-1)), chlorfenvinfos in carrot (0.094-0.131 microg g(-1)), were found. However, fonofos and fenthion were not detected in all the collected vegetable samples.

Carbamate pesticide residues analysis of potato tuber samples using high-performance liquid chromatography (HPLC)

“…In total, the pesticide residues that are found in vegetables become a global phenomenon. A similar study reported that, the residue of carbamate pesticides in Potato tuber samples in Egypt and abroad, agrees with this study (Abd El Rahman, 2005;Mansour et al, 2009;Wang et al, 2008;Quinetro et al, 2008).…”

Pesticide residue analysis in parsley, lettuce and spinach by LC-MS/MS

“…These findings indicate that pesticides were extensively used in parsley, lettuce and spinach cultivation in Hatay. Wang et al (2008) analyzed eight organophosphorus pesticide residues (OPP) in fresh vegetables retailed in agricultural product markets of Nanjing (China). While dimethoate (0.118-0.124 mg kg (26.7%), fonofos and fenthion were not detected in any of the samples.…”

Determination of organophosphorus pesticide residues in vegetables by an enzyme inhibition method using α-naphthyl acetate esterase extracted from wheat flour

“…The analyses followed published procedures (Rastrelli et al, 2002;Anastassiades et al, 2003;Hamscher et al, 2007;Wang et al, 2008;Lv et al, 2009). In brief, the homogenized lettuce sample (10 g), ethyl acetate (20 g), and anhydrous sodium sulfate (15 g) were mixed thoroughly in a 50-ml centrifuge tube wrapped in silver paper using a vortex mixer, and were shaken for 30 min by reciprocating shakers at room temperature.…”