Screening and Risk Study of New Pollutants in Maozhou River Basin
The Maozhou River in the Pearl River Delta water system is an important water source,but it has been increasingly threatened by pollution in recent years.This study aims to comprehensively understand the situation of new pollutants in Maozhou River through systematic pollutant screening and risk assessment,and propose cor-responding management suggestions.In the study,water samples were first collected from 50 sampling points,in-cluding 23 major drinking water source locations.The sample was analyzed by high-performance liquid chroma-tography high-resolution mass spectrometry.By sorting over 15000 features,620 different compounds were dis-covered,covering multiple categories such as pharmaceuticals,pesticides,veterinary drugs,personal care products,and industrial materials.Among pharmaceutical pollutants,diazepam,nicotine,and sulfamethoxazole have been widely detected.In terms of pesticides,atomycin,isoprothiocarbamate,and tricyclazole account for the main pro-portion.In addition,the residues of veterinary drugs and personal care products have also attracted attention.Through analysis based on concentration and toxicity,it was determined that the risk coefficient(RQ)of 12 com-pounds exceeded 1,including pesticides such as bensulfuron methyl ether,imidacloprid and thiamethoxam,as well as drugs such as caffeine.These compounds may pose potential risks to aquatic organisms,especially benzenesul-furon methyl ether,which has been detected at multiple sampling points and its concentration exceeds the mini-mum predicted ineffective concentration(PNEC).Based on the research results,the following suggestions are pro-posed:it is recommended to establish a regular monitoring network to track the concentration changes of pollu-tants in the Maozhou River,and timely detect and respond to the emergence of new pollutants.For high-risk compounds detected,regulatory measures should be strengthened to control their emissions and use,in order to reduce potential risks to aquatic organisms.It is recommended to adopt more effective sewage treatment technolo-gies to improve the removal efficiency of pollutants such as drugs and pesticides,and reduce the possibility of them entering the water body.By conducting environmental education and publicity activities,public awareness of water pollution issues should be raised;environmental awareness should be promoted,and the ecological environ-ment of Maozhou River should be jointly protected.
Pearl River Delta water systempollutant screeningrisk study
万方数据
维普
