Health Risk Assessment and Spatial Distribution Characteristic on Heavy Metals Pollution of Haihe River Basin

摘要

The concentrations of carcinogenic risk substances of cadmium (Cd), chromium (Cr), arsenic (As) as well as noncarcinogenic risk substances of lead (Pb), mercury (Hg), Copper (Cu), zinc (Zn), ammonia (NH3-N) and nitrate (NO3--N) were determined in water samples in the Haihe River Basin. Furthermore, human health risk by water consumption were also assessed, it was obviously distributed with regional characteristics. For carcinogenic risk, there was Cd that were all under the 5.0×10-5•a-1 in the whole basin, therefore, Cd was not a carcinogenic risk source of Haihe River Basin, in addition to this, the carcinogenic risk of Cr6+ were larger than 5.0×10-5•a-1 in six sites, especially the carcinogenic risk of Cr6+ was almost 20 times larger than 5.0×10-5•a-1 in the Aixinzhuang village of Xingtai City of Hebei Province, the concentration of Cr6+ of Yongdinghe River system and estuary of Haihe river were all considerable higher than the acceptable level of 5.0×10-5•a-1 in the whole river basin, besides that, the spatial distribution characteristics of As was similar with that of Cr6+ in the Haihe River Basin, Furthermore, for the non-carcinogenic risk, the risk of non-carcinogenic risk of Pb, Hg, Cu, Zn, NH3-N and NO3--N are all less than 5.0×10-5•a-1, therefore, the potential human heath impact of water consumption were Cr6+ and Cd, the pollution level need to be controlled in the future.