Pollution Characteristics Of Heavy Metal And Risk Assessment Of The Hun River Alluvial And Flood Fan In ShenYang

With the rapid development of urban economy, industrialization, and theenvironmental problems are increasingly serious, such as represented diseases,hazards events and carcinogenic problems, which are caused by heavy metal pollutionare taken seriously by people. The Hun River is an inland river in Shenyang, the riveraccepts the waste water and sewage that come from Shenyang city with a long mostpart of industrial term, the pollution of water is serious, and brings harms on theecological environment. In this paper, to investigate current heavy metal pollutioncondition around Hun River in ShenYang, the research took the Hun river alluvial andflood fan as the investigated area, used LiaoNing soil environmental backgroundvalues, Drinking Water Quality (GB5749-2006) as the evaluated standards,performed by the N.L.Nemerow comprehensive pollution index, the potentialecological risk index and the health risk assessment model, combined with ArcGISspatial analysis method, through researching, sampling, monitoring, heavy metalcontent and spatial distribution characteristics, combination characteristics and themain sources of heavy metal elements in soil and underground drinking water of theHun river alluvial and flood fan in ShenYang was evaluated and analysed respectively.All these studies were to provide scientific support about how to control，supervise，renovate the heavy metals pollution problems. The results of the research indicatedthat:1. In the investigated area, all the concentration of Cu, Pb, Cr and As in soilsamples generally were higher than the background values in LiaoNing Province soilsamong50simples. The concentration of Cu in82%soil samples, Cr in94%samples,Pb in86%samples and As in100%samples exceeded the criteria. The concentrationof Cu ranged from16.51to65.20mg/kg, Cr ranged from50.63to122.85mg/kg, Pbranged from17.72to114.46mg/kg, As ranged from11.18to41.36mg/kg. The wholeorder of enrichment degree was: As>Pb>Cr>Cu. Based on the Nemerow indexmethod, the points of light pollution, moderate pollution, and severe pollutionrespectively accounted for28%,54%,18%of the total number of samples. Evaluated by Hakanson’s Potential Ecological Risk evaluation Index, all ecological risk index RIin the region was far less than150. The investigated area belonged to slight ecologicalrisk level, but As was the main contribution of the pollution factor among them, asthe priority control pollutant.2. Compared with the Chinese national standard for Drinking Water Quality (GB5749-2006), except the4samples of Pb, all the other heavy metals content didn’texceed the standard among30underground water drinking samples. Pb was the maincontaminant in underground drinking water of the investigated area. Assessed bywater environmental health risk assessment model, but total health risks caused by theheavy metals in underground drinking water didn’t result in the high health risk value,the threat of human body was small, the noncarcinogenic heavy metals health riskwhich compared to the carcinogenic heavy metals was negligible, illustrating that thehealth risks which was caused by the carcinogens heavy metals was the main sourcein the investigated area.3. For the Hun River alluvial and flood fan in ShenYang, for the goal heavymetals in soil and underground drinking water, the main contaminant was Pb inunderground drinking water, all the other heavy metals content didn’t exceed thestandard. Then the soil had been polluted by the heavy metals in different degree, Aspollution was the most prominent, but environmental risk values of the heavy metalswere lower, Heavy metals in study area couldn’t result in obvious damage to theecological environment and human health.