Investigation And Analysis Of 20 Pesticide Residues In Vegetables Marketed In 5 Cities Of Jilin Province And Risk Assessment Of Dietary Exposure

China's food safety problems have emerged in recent years,and pesticide residues have always been one of the key issues of concern.Vegetable intake accounts for a large proportion of people's daily diet,and its safety is particularly important.As a kind of food that is susceptible to pesticide pollution,it is worthwhile to discuss whether the residual content exceeds the standard and whether it is harmful to the health of residents.In recent years,the relevant literature on the investigation of pesticide residues in vegetables sold in Jilin Province has hardly been reported.In order to clarify this situation and in-depth study on whether it is harmful to human health,this paper is based on the release of the Ministry of Commerce of the People's Republic of China in 2013."SB/T10029-2012 Fresh Vegetables and Vegetables in the Code",combined with the dietary characteristics of residents in Jilin Province,selectively tested 8 major market-selling vegetables in 5 major cities in Jilin Province,and selected according to literature reports.The commonly used QuECHERs method is used to pre-process the collected samples,and then the processed sample solution is detected by gas chromatography tandem mass spectrometry(GC-MS)method to detect the residual of 20 pesticides,and the recovery rate of the sample is measured by using the sample.The method evaluates the validity of the test results and ultimately conducts a relevant dietary exposure risk assessment based on the test results.The main findings are as follows:(1)The cities for sample collection are Changchun City,Siping City,Liaoyuan City,Jilin City,and Songyuan City of Jilin Province.The collection location mainly selects major sales places such as large supermarket chains in the city.(2)A total of 453 vegetable samples were collected.The eight vegetables selected for testing were: green leafy vegetables,Chinese cabbage vegetables,root vegetables,legume vegetables,onion and garlic vegetables,solanaceous vegetables,yam vegetables,and sprout vegetables.(3)The 20 pesticides selected for testing were phoxim,malathion,chlorpyrifos,dichlorvos,trichlorfon,profenofos,omethoate,triazophos,chlorpyrifos,acephate;Duowei,butyl thiocarb,propofol,zhongdingwei;beta-cypermethrin,cyhalothrin,bifenthrin,fenpropathrin,fenvalerate,deltamethrin.(4)The method selected in this experiment has a good linearity in the range of 0.01 to 1 ?g/mL,and the linear correlation coefficient R2 ? 0.99.The detection limit of this method is 0.0001~0.0164mg/kg,and the limit of quantification is 0.0002~0.0555mg/kg.The recovery rate of 20 pesticides ranged from 67% to 112%.Precision <10%.The results show that the method recovery and precision can meet the requirements.The method can be used for sample analysis.(5)203 samples of 453 samples of 8 types of vegetables tested in this study detected pesticide residues,accounting for 44.812% of the total number of samples.Among them,the detection rate of pesticides in green leafy vegetables was the highest,being 74.13%.The detection rate of solanaceous vegetables was low at 23.684%.Among them,60 samples of pesticide residues were detected,which accounted for 13.245% of the total number of samples.The pesticide residues of the two types of vegetables did not exceed the national maximum residue limit,which were legume vegetables and solanaceous vegetables.The pesticide residues in the remaining 6 types of vegetables were exceeded.(6)Six of the 20 pesticides tested were not detected,namely triazophos,chlorpyrifos,zhongdingwei,fenpropathrin,isoprocarb,and cyhalothrin.The remaining 14 pesticides were detected.The detection rates of methomyl and malathion were 6.623% and 6.181%,respectively,and the detection rates of deltamethrin and fenvalerate were lower,0.221% and 0.441%,respectively.(7)The 14 pesticides detected in this study did not cause significant health hazards to the ingested population from the perspective of single pollution level.The combined pollution of multiple pesticide residues may pose a human health risk.The maximum risk factor of the three pesticides is greater than 1,which may cause potential harm to human health.The maximum risk factor of the other 11 pesticides is less than 1,which will not cause potential harm to the health of the ingested population.