Study On Heavy Metals' Pollution Effects Of Sigou Lead-Zinc Mining Area In Qinling Mountains

Sigou lead-zinc mining area is one of the important lead-zinc mineral resource bases of Shaanxi province. For years unreasonable exploiting, the mining sources has induced not only various mine geological disasters but also serious pollutions, especially the heavy metal pollutions which led by"the wastes of 3"(waste water, waste mineral residue and waste gas). Continue accumulation of heavy metals in human body can not only conduced distortion, cancer and gene mutation, but also caused acute or chronic poisoning. It can be seen that thoroughly researching the mechanism of heavy metals contamination of mine and carrying out effective prevention and control have been imminent.This paper choosed Sigou as the research scope in Qinling mountains. Informations were investigated in the field. Lead-zinc residue, surface water, sediment and plant samples were gathered. These samples were tested, Pb, Zn, Cr, Cd, Cu, five heavy metals with flame atomic absorption spectrophotometer in the laboratory. The results showed that Sigou mining area had been polluted and the pollution belonged to high level, while the downriver's was more serious. The contamination index of Cd was the highest. The mud enriched the heavy metals quite easily. The sequence of the ability of enrichment was Pb>Zn>Cr>Cd. The concerntration of sediment and surface water was in direct proportion. To the chinese pine samples, the accumulation ability of heavy metals was Pb>Zn>Cu>Cr>Cd. The gradation of total metals was pine branch>pine cone>pine needle while to the grasses samples was herbage>root.Tessier five-step sequential extraction methods were used to test the modality of heavy metals. The outcomes indicated that heavy metals were majorly resident of residual form and controlled by exchengeable configuration if sent to the environment. Leaching test was used to simulate the release process of heavy metals in the residue under natural conditions. The concertrations of Pb and Zn descended first, and then ascended in early period. The consistencies of Pb and Cd were ascensive.