Assessment Of Sediment Ecological Risk And Human Health Risks Posed By Heavy Metals Contaminants From Suya Lake Reservoir

In the Huai river upstream Suya Lake Reservoir70sample points, take overlying water and sedimentin the same point．FourPelteobagrus fulvidraco and Carassiusauratus of similar size were collected fromthe field of Suya lake, respectively． In sediments obtained from centrifugal interstitialwater． Concentrations of Cd,Co,Cr,Cu,Ga,Ni, Pb,Sb,Sn,Sr,Zn, and Ba in water,interstitial water, fish andsediment samples, were determined, and SEM (simultaneously extracted metals)were determined insediment． Based on which，the spatial and space distributions，speciation，transport，sources andaccumulation were investigated．The health risks assessmen of water with preliminary study； The heavymetal contamination degree and latent ecological risk in sediment by the method of analysis Cd,Co,Cr,Cu,Ni, Pb and Zn elements and selenium and evaluation of ecological risk． The main conclusions drawn areas follows:(1)The average of the heavy metal element Cd,Co,Cr,Cu,Ga,Ni, Pb,Sb,Sn,Sr,Zn, and Ba contentchanges big heterogeneity in Suya Lake Reservoir:Overlying water element content sorting:Sr>Ba>Zn>Cr>Ni>Cu>Ga>Sb>Co>207Pb>206Pb>208Pb>Sn>CdInterstitial water element contentsorting: Sr>Ba>Zn>Cr>Ni>Cu>Ga>Sb>Co>Sn>207Pb>206Pb>208Pb>Cd Sediment elements in order:Ba>Sr>Zn>Cr>Ga>Ni>Cu>206Pb>207Pb>208Pb>Co>Sn>Sb>Cd．The reservoirs in the earth’s crustwith elements in abundance and SuYaHu reservoir on the source material．There was appositive correlationbetween therecoverable(acid+soluble+reducible+oxidisable),Fraetions and the total content of heavymetals．This may refleet that heavy metals which came from humanaetivities． Element Cu Zn Ga and Sboverlying water content than the interstitial water, think the remittance is pollution, Element Cr Sr and Ba water content in clearance is far greater than overlying water, has become the source of the contamination,which should be pay attention to related departments．(2) SuYaHu overlying water gap water element in the distribution of space, SuYaHu lake weekselement high concentration area, in the middle of the dam and low concentration and sediment Sr Crdistribution again, the rest elements present a high concentration area in the middle of the dam for or highconcentration area around, Sediments in geometrical shape elements of the spatial distribution of total arebasically the same, a little change．Overlying water element content RuHe and north RuHe mainly by the,the effects of the water element content gap mainly by the influence of the store ditch, the sedimentpollution source in a certain effect． SuYaHu content of each element distribution around by the influenceof the lake all rivers, but the scope and different elements(3) Concentrations of Cd,Co,Cr,Cu,Ga,Ni, Pb,Sb,Sn,Sr,Zn, and Ba in muscle tissue of fulvidraco andCarassiusauratus of the Suya lake content in order were fulvidraco Zn＞Sr＞Ba＞Cu＞Cr＞Pb＞Ni＞Co＞Sn＞Cd；Carassiusauratus Zn＞Sr＞Cu＞Ba＞Cr＞Pb＞Ni＞Co＞Cd＞Sn；Zn content is the highest,Sr comes second． Cd and Sn were the lowest．The heavy metal content Carassiusauratus of different levelhigh than fulvidraco，Muscle of heavy metals in content was lower than fish organs in the organization． Significant accumulation of heavy metals has occurred in fulvidraco and Carassiusauratus of theSuya lake． BCF of Zn content is the highest, suggesting the strongest accumulation ability． Pb comessecond, Sr and Co were the lowest． BCF in order was fulvidraco Pb＞Zn＞Cu＞Cr＞Ni＞Cd＞Sn＞Ba＞Sr＞Co, CarassiusauratusZn＞Pb＞Cu＞Cr＞Cd＞Ni＞Sn＞Ba＞Sr＞Co．Carassiusauratus for watercreature of the heavy metal concentration coefficient of different level higher than fulvidraco． Life indifferent water fish, the body of the accumulation of heavy metal different sources． Water or sedimentheavy metals and fish in the content of heavy metal, has significant correlation． (4) The single factor water quality evaluation results are shown, water in SuYaHu lake is at GradeI． Drinking water and skin contact2kinds of ways the carcinogenic exposure for drinking water intakeamount> skin can absorb, water is the main way that human exposure way．Exposures of contaminants inthe order of Cr＞Zn＞Cu＞Ni＞Co＞Pb＞Cd． The water pollution harm index7total were not morethan1, so that the water can be basic to the crowd will not produce the carcinogenic chronic poisoneffect． Cancer risk indexes of contaminants in SuYaHu lake water decrease in the order ofCd＞Pb＞Ni＞Cu＞Mn＞Zn＞Cr6+＞Co． Pb is not a major carcinogen, with the contribution98．78%~99．07%．(5) Multiple ecological harm index evaluation of heavy metal, the potential for ecological harm,belong to moderate pollution levels． According to a single heavy metal pollution coefficient for order:Cd>Ni>Cu>Cr>Co>Zn>Pb, According to the potential ecological harm coefficient for order:Cd>Ni>Cu>Co>Pb>Cr>Zn． And No diffent bettwen the Huaihe river in aAnhui period of consistent andDian lake Cumulative index method to evaluate element pollution degree of order:Cd>Ni>Zn>Pb>Cu>Cr>Co． Accumulation of index method and potential ecological harm coefficientmethod income results Cd the pollution condition is relatively serious, belongs to the severe pollution,ecological risk the most outstanding, followed by Ni, Cu also is more important． And tai lake dianchi lakein anhui province huai river main road with the same for different chao lake． Heavy metal elements of theoriginal value of the secondary facies compared to order: Cd>Co>Zn>Ni>Cu>Pb>Cr． Heavy metalelements of the secondary primary facies in order for enrichment coefficients: Cr>Co>Ni>Pb>Cu>Cd>ZnTwo kinds of pollution evaluation method of the evaluation results biggest difference Cd pollution, Cu PbZn are also different．...