Cumulative intake risk assessment of multi-pesicidies in local tea samples in Guangdong Province

ObjectiveTo evaluate the chronic and acute exposure risk of the 13 commonly used pesticides in local tea samples in Guangdong Province， so as to provide the basis and technical support for production supervision and consumption， and provide data for the revision of maximum residue limits （MRLs）.Methods110 local tea samples were collected from the year 2017—2020， and 13 pesticide residues were detected and quantified following the GB 23200.113-2018 method based on GC-MS/MS. Acute and chronic cumulative risk assessment were calculated using hazard index （HI） approach.Results8 kinds of pesticides in 110 local tea samples were detected in which the detection rates and the residue levels of bifenthrin， fenpropathrin and cypermethrin were the highest. The cumulative chronic and acute exposure levels of bifenthrin， fenpropathrin and cypermethrin to tea intake of Guangdong residents were 4.87×10-5 mg/（kg bw·d） and 4.79×10-3 mg/（kg bw·d）， accounting for 89.09% and 86.01% of the total pesticide exposure， respectively. The chronic and acute exposure level of males were higher than females， and urban residents were higher than rural residents. For all the pesticides detected， their chronic and acute cumulative hazard indexes were 3.69×10-3 and 4.66×10-1， respectively， which indicated that the risk was low.ConclusionThe chronic and acute dietary exposure risk of pesticide residues from local tea were both low， but pesticide residues in Guangdong province were common， so the application and management of pesicides in local tea should be further strengthened.