Abstract
The purpose of this study was to optimize the pre-treatment process for the detection of 9 organophosphorus pesticide residues in cabbage by gas chromatography, and to conduct a comparative experiment between this method and the standard method NY/T 761-2008 of the Ministry of Agriculture. The results show that the optimized pre-treatment method is to use 10 mL acetonitrile as the extractant, 150 mg N-propyl ethylenediamine (PSA) and 15 mg graphitized carbon black (GCB) as the purification agent, which can reduce the use of extractant and inorganic salt in the pre-treatment process, increase the recovery and detection limit, reduce the matrix effect and cost of instrument maintenance.
Highlights
Pesticides can be divided into insecticides, fungicides, herbicides, and acaricides according to the control objects
Insecticides account for about 65% of China's total pesticides, while organophosphorus pesticides (OPPs) account for more than 70% of total insecticides [1]
Experimental procedures followed as: 5.0 g of homogenized cabbages was accurately weighed, the extractant was added and separated the pesticide residues in cabbage. 2.0 g of MgSO4 and 0.5 g of NaCl were added as water remover and shake for 5 min, the supernatants were obtained after centrifuged at 4000 r/min for 5 min. 5.0 mL of supernatants were taken and added a certain amount of PSA and 15 mg of graphitized carbon black (GCB)
Summary
Pesticides can be divided into insecticides, fungicides, herbicides, and acaricides according to the control objects. Insecticides account for about 65% of China's total pesticides, while organophosphorus pesticides (OPPs) account for more than 70% of total insecticides [1]. OPPs have the advantages of high efficiency and relatively low cost, which has become the most widely used pesticides in agriculture of China [2]. Misuse and excessive use of OPPs have aggravated pesticide residues in agricultural products [3]. It is necessary to establish a highly selective and sensitive analytical method to detect pesticide residues, and provide technical support for the prevention and control of pesticide pollution and the standardized use of pesticides [5]. Gas chromatography (GC) is currently one of the most widely commonly used detection methods, especially fruit and vegetable matrix systems. The selection of a suitable pre-treatment process is a prerequisite for the analysis of complex samples [6]
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