Risk Assessment Of Dietary Study On Statistical Modeling Of Pesticide Residues In China

For a long time,agricultural workers use pesticides to control pests such as diseases,insect pests and weeds,and to effectively regulate and protect the growth of crops.However,the use of pesticides inevitably leads to pesticide residues.In particular,pesticides not only cause pollution to the atmosphere,soil,water and other ecological environment,but also accumulate in the human body through food chain transmission,seriously affecting people’s health and life safety.In recent years,the scope of action of pyrethroid pesticides has been continuously expanded,and the application amount has been continuously increased.The problem of pesticide residues has become increasingly prominent,and the hidden danger of food safety has been increasing day by day.Today,it is particularly important to assess the risk of dietary exposure to pesticides.In my master’s dissertation,the risk of pyrethroid pesticide intake was evaluated from the following aspects:The preliminary data and methods were discussed.As for the preliminary data,the processing of undetected data,the fitting of parameter distribution and the test of goodness of fit were introduced.As for risk assessment,the steps and meanings of the assessment process were introduced,and the methods of point assessment,simple distribution assessment and probability assessment were discussed respectively,according to different levels of data utilization.Descriptive statistical analysis of the data was carried out.After preliminary grasp of the dietary consumption and pesticide residues detection situation,it was found that pesticide residues mainly came from two kinds of dietary,vegetables and fruits,and the residue content of vegetables was relatively high.The risk of pesticide exposure was assessed.By using different forms of dietary consumption and pesticide residue concentration data(such as point value form,distribution form),from multiple perspectives including pesticide types,population ages and residential areas,chronic exposure assessment studies respectively were conducted,and the following conclusions were gotten: in terms of assessment model,point assessment has a great uncertainty,and the assessment scope is limited.The pesticide residue concentration in the simple distribution assessment is the mean point data,so the accuracy of the high exposure assessment results obtained by the analysis is limited.The probability assessment does not consider the mean data alone,so the results can be considered as the daily situation of the whole.In terms of chronic exposure assessment results,cypermethrin had a higher exposure risk among the three pesticides,followed by cyhalothrin and fenpropathrin.For the four groups of people of different ages,children always showed high exposure,followed by adolescents,and the exposure of adults and the elderly was always relatively low.For the two types of areas,the exposure situation always varies with pesticide types,population ages,and exposure levels.