Detection of pesticide residues in vegetables sold in Changchun City，China.

In this essay we investigate mainly 18 pesticide residues with different chemical structures in fresh vegetables, including organochlorine pesticides, organophosphorus pesticides, carbamate pesticides and pyrethroid pesticides. At the same time, it is estimated that the potential health risks for residents. A total of 313 samples were collected from 12 kinds of vegetables from Changchun, the capital of Jilin Province,China. 18 pesticide residues in 313 samples were analyzed by Gas chromatography and mass spectrometry (GC-MS) . Testing linearity was favorable in the range of 0.01 - 1.00μg/mL, R 2 ≥0.99, and the recovery rate of pesticides was 62% - 110%, the relative standard deviation < 5%, the detection limit of the pesticide is 0.0001 - 0.0167 mg / kg, the limit of quantification is 0.0002 - 0.0556 mg / kg. Overall, the detection rate of pesticides was 28.43%, and the detection rate and over-standard rate of celery were the highest, while the pesticide detection rate of potatoes was the lowest, and the pesticide exceeding rate of cucumber was the lowest. Three pesticides tested were not detected in the 18 pesticides including heptachlor, chlorpyrifos and permethrin. Among the 15 pesticides detected, the maximum risk factor of 7 pesticides is greater than 1 such as carbofuran, omethoate, phorate, dicofol, dimethoate, chlorpyrifos and dichlorvos, which may cause potential harm to human health. In contrast others will be safe. It could not have significant perniciousness for people from the perspective of single pollution level,, but it is not ignored there are multiple pesticide residue compound pollution to endanger persons' health.