Pesticide residues and risk assessment in aquatic water and products under typical rice-crab and rice-shrimp integrated cultivation patterns in areas of Jiangsu Province
In this study,we sought to evaluate the residual levels of pesticides and their ecological and health risks in typical comprehensive planting and breeding demonstration areas("rice-crab"and"rice-shrimp")in selected areas of Jiangsu Province.Triple quadrupole gas chromatography-mass spectrometry was used to track and monitor 208 pesticide residues in samples collected in six aquaculture areas.Furthermore,we used the entropy value method and food safety index to conduct ecological risk assessment of aquaculture water and a health risk assessment of aquatic products,respectively.The results showed that the main types of pesticides detected in the aquatic environment were herbicides,fungicides,and plant growth regulators,with an average mass fraction of 0.33µg·L-1.Collectively,the amounts of herbicides,fungicides,and plant growth regulators accounted for 90%of the total pesticides,with the remainder being contributed by smaller amounts of pesticides such as acaricides and synergists.The average mass fraction of pesticides(herbicides,fungicides,insecticides,and plant growth regulators)detected in aquatic products was 6.1µg·kg-1(wet).At the pre-culture stage,the sources of pesticides in the aquaculture aquatic environment were residual or exogenous pollution.With a prolongation of breeding time,the contents of these pesticides will decline.The ecological risks of aquaculture water were all assessed to be medium,and the risk entropy of each sampling point was between 0 and 1.Particular attention should be paid to herbicides and other pesticides,as these have a certain pressure on the ecological environment.In the monitoring cycle,the trend of the residual amounts of most pesticides in aquatic products was similar to that of changes in the aquatic environment,gradually decreasing until becoming undetectable.However,we detected the presence of small amounts of fungicides at some sites.Analysis of the health risks to shrimps and crabs during the same period revealed that the average of food safety index was considerably less than 1,thereby indicating that the food safety risk of pesticide residues at the monitored sites was acceptable.
rice-shrimprice-crabcomprehensive planting and breeding modepesticide residuehealth riskecological risk
万方数据
维普
