Study On Geochemical Characteristics And Potential Ecological Risk Of Toxic Elements In Aohanqi Area

A large number of geochemical exploration datas are obtained from geological survey,which is not only important for delineate geochemical anomaly and guide geological prospecting, but also can provide scientific basis to ecological environment impact assessment in the study area. Through explore and utilize the geochemical data which is toxic element for biological. The different pollutants in environmental form migration and transformation of various ways, and enter the human body to formed the food chain and provide threat to human health. Existing research result is confirmed that the heavy metal in soil pollutant is more prominent, such as Hg, Cd, Pb, Cr and As is significant to biological toxicity, while Zn, Cu, Ni, Co, Sn is general to biological toxicity.We analyzed 20 kinds of elements and achieved a lot of geochemical data from 1:50,000 water and soil geochemical exploration for Aohanqi. In this paper, I delineate geochemical anomaly and find out the cause of abnormal, and provide information for the geological prospecting based on 1: 50,000 water and soil geochemical explorati for Aohanqi. According to the characters of element content five integrated anomalys are delineated. There are two anomaly areas have the significance of geological prospecting.The anomaly areas are H-2 and H-4, which are combined with geochemical profile data validation. There are two exceptions center located in H-2 area. An exception center is located on the north side of shangtiegou, another center located on the north side of xiaoshan. H-2 combination anomaly area is composed of element anomalies of Ag, As,Au, Bi, Cd, Co, Cu, Mo, Nb, Ni, Pb, Sb, Sn, TFe, W, Y, Zn. In this area, Ag has the zone of inside, anomalous peak with 2.28. Bi has the zone of outside middle and inside,anomalous peak with 143. Cd has the zone of outside middle and inside, anomalous peakwith 10.6. Cu has the zone of outside and middle, anomalous peak with 619. Zn has the zone of outside and middle, anomalous peak with 1189.H-4 combination anomaly area is composed of element anomalies of Ag, As, Au, Bi,Cd, Co, Cu, La, Mo, Nb, Ni, Pb, Sb, Sn, TFe, W, Y and Zn. There are two exceptions center located on the north side of hougongdi and fangshen birdge. In this combination anomaly area, there is a deposit in the mining area, which showed that the abnormal caused by mine.In this paper, the potential ecological risk of toxic elements was studied in the study area with the date of 1: 50,000 water and soil geochemical exploration for Aohanqi. Using single factor pollution index evaluate single element pollution level. Using the response coefficient of heavy metal elements toxicity evaluate potential risk areas of toxic elements.The main study area of potential ecological risk elements are Cd, Pb, As. The most harmful element is Cd. The main potential pollution factors are human geological factors and primary geological environment factors. Human geological factors include quarries,mining sites, garbage dumps and the like.