Study On Residue And Bioaccumulation Of Pesticides In Three Edible Fungi

Flammulina velutipes, Pleurotus eryngii and Hypsizygus marmoreus are cultivated in every season all over the country. The research aimed to residual dynamic of HCH,DDT,chlorothalonil,cypermethrin,chlorpyrifos and carbendazim in the substrates of three edible fungus cultivating in the factory to control the content of persistent pesticides in the substrates and make decision of reasonable using pesticides.In the paper, the detection methods of pesticides residue in two substrates and three edible fungus were established using GC and ultraviolet (UV) method. The half-life of six pesticides in the substrates were calculated.The results showed that linearity correlation coefficients of six pesticides residue were between 0.9900 to 0.9997, recovery was from 75% to 115%, detection limitation amount was 002～0.3 mg/kg. The half-life day of HCH, DDT and chlorpyrifos was 27～32, 27～33 and 22～24 respectively and the residue were detected in the substrates and fruitbodies when fungi were inoculated to the substrated, There were no cypermethrin detected in the fruitbodies, and it's half-life day in the substrate was 19～20. Carbendazim used for control germina was also detected in the substrates and fruitbodies with a half-life from 19 days to 20 days. Because of it's short half-life (2 days to 4 days), the degradation of Chlorothalonil in substrates and fruitbodie were quickly and no chlorothanonil were detected both in the substrates and fruitbodies when harves.The results showed that DDT, HCH, chlorpyrifos and carbendazim were detected in the fruitbodies when harvested. It is suggested that the pesticides in the substrates should be detected so that could control the polluting source. Application ratio and time of chlorothalonil must control strictly during the cultivation of edible fungus.