Environmental Risk Assessment of Acetochlor on Aquatic Organisms in Typical Corn Planting Watersheds
Acetochlor is a commonly used pre-seedling herbicide for corn,a major grain crop in Beijing,potential-ly leaves residues in the environment and these residues have adverse effects on the survival,growth,and reproduc-tion of aquatic organisms.To assess the environmental risk of acetochlor to aquatic organisms in typical corn agri-cultural watershed in Beijing,this study used high-performance liquid chromatography and mass spectrometry to analyze surface water samples and obtained the concentration of acetochlor in aquatic environment.Besides,we used toxicity data to calculate the predicted no-effect concentration of acetochlor.Finally,the environmental risk was characterized.Findings revealed that the concentration of acetochlor in aquatic environment were in the range of ND～0.034 μg·L-1,and the measured environmental concentration of acetochlor was 0.034 μg·L-1.Based on toxicity data of acetochlor to aquatic organisms which include three trophic levels(algae,daphnia,and fish),we calculated that the predicted no-effect concentration of acetochlor was 0.052 μg·L-1.The risk assessment showed that the use of acetochlor in this area posed an acceptable risk to aquatic organisms.
NETL
NSTL
万方数据
