Residues and health risk assessment of pesticides in river crab by integrated rice field aquaculture in northeast China

In order to fully understand the pesticide residues of river crab (Eriocheir sinensis) cultured in rice fields in northeast China, a total of 42 pesticide residues were determined in E. sinensis obtained from major integrated rice-crab aquaculture field in Jilin, Liaoning and Heilongjiang Provinces in northeast China by gas chromatography/mass spectrometry and liquid chromatography/mass spectrometry. Index of food safety (IFS) method was used for health risk assessment. Fourteen pesticides, such as β-HCH, p, p′-DDE, oxyfluorfen, butachlor, acetochlor and atrazine were found in the samples. The other 28 pesticides were not detected. β-HCH (89.3%) and p, p′-DDE (82.1%) were the most frequently detected residues. The maximum residues were found in oxyfluorfen (256 μg·kg^–1) and butachlor (185 μg·kg^–1). The IFS value of detected pesticides were all less than 1 and the average \overline \rmIFS was 0.000 7. The health risk of pesticide residues in river crab from rice field in northeast China is at safe level.