The Study Of Comprehensive Risk Pesticides And Triazophos Dietary Exposure Assessment In Rice

In this paper, refered to The Model of Environmental Impact Quotient proposed by IPM experts in Cornell University, some changes and additions have been made to it and the pesticides risk assessment CEIQ model and El model were established taking into consideration of practical treatment of pesticides in China.The risk assessment of 29 kinds of pesticides in rice were evaluated. The field trials for Triazophos used widely in China for were carried out. According to the results of field trial of residue, the dietary exposure and risk assessment were made in different years for different age groupsThe main results were as follows:With the mode of CEIQ,the outcomes of assessments for 29 kinds of pesticides in rice showed that:the risk of phoxim, dimethoate, parathion, carbofuran, carbosulfan, hymexazol and dichlorvos were higher. the EIQ value of insecticides were generally higher than fungicides. It indicated that, the risk of insecticides is higher than fungicides in actual production.The El model were established with consideration of the dose registered of 29 kinds of pesticides and the CEIQ. With the EI model, the EI were calculated for 29 kinds of pesticides in rice. The results indicated that the risk of hymexazol, carbofuran, parathion, phoxim,dimethoate, kitazin and diazinon were higher. The comprehensive risk of Pesticide were not only related to the toxicity, but also with its application dose. According to the Pesticides CEIQ values and El values, the producer may chose the pesitide with less risk while with the similar control effects. Triazophos were considered with low risk.According to the calculation method of pesticide resdue dietary intake (PRI) in FAO/ WHO exposure assessment and the data of triazophos residue, the exposure estimate for rice and its products with different ages and years were evaluated. The theoretical intakes for the ages of 2-5,6-17,18-45 and more than 45 years were lower than the theoretical permitted value, and the risk were relatively lower. The result showed that Triazophos in rice and its products has lower dietary exposure risk with the recommended amount in controlling rice pests and diseases and the entended harvest time.