吡虫啉的本土物种敏感性分布及水质基准研究OACSTPCD

Imidacloprid(IMI)is a neonicotinoid insecticide.Its residues in the environment can potentially cause chronic toxicity to aquatic organisms.However,there is currently a lack of water quality criteria for IMI in China.To establish water quality criteria for IMI and evaluate its ecological risk to native aquatic species,acute and chronic toxicity data for IMI on Chinese freshwater a-quatic organisms were collected.The collected acute toxicity data of IMI involved 21 species of 14 families across 5 phyla.A total of 15 chronic toxicity data of 5 phyla and 11 families were obtained.Log-normal and Log-logistic distributions were selected to fit the toxicity data to obtain the species sensitivity distribution of IMI.The goodness-of-fit test showed that the Log-normal distribution had a better fit for both acute and chronic data.For native aquatic species in China,the short-term water quality criteria of IMI was 6.95μg/L,and the long-term water quality criteria of IMI was 0.47 μg/L,which can be used as the water quality criteria for the protec-tion of aquatic organisms in China.The ecological risk of IMI in China's major river basins was evaluated by the risk quotient meth-od.The results showed that 78.95％of the surface water bodies in China's major watersheds exhibited low risk,and 15.79％were at medium risk.This study can provide a scientific basis for the establishment of water quality criteria for IMI,aquatic organism pro-tection,and aquatic ecological environment management.