Research On The Heavy Metal Pollution In Anhe River

The ecological environment problems caused by mining development has become a global problem, has attracted more and more people’s attention, has become an important field of environmental geochemistry.Mining development activities in Qinling Mountains Anhe River, the propagation of frequency, mining wastewater, waste dumps and tailings, poses a serious threat to the coastal farmland soil and vegetation, and easily lead to ecological environment deterioration on river.Taking the Qinling Mountains river basin water, sediments, soil and vegetation along the coast as the research object, the river set5sampling points. By means of atomic absorption spectrophotometer precise determination of its content weight determination of toxic heavy metals in samples Cu, Zn, Pb, Cd, Cr, and combined with the analysis of these heavy metals in sediments and soils distribution characteristics of Tessier sequential extraction, heavy metals in different environmental media in the spatial distribution, speciation and heavy metal the activity was revealed, and evaluate its in water, sediments and soils of the potential ecological risk degree. The main conclusions are as follows:(1)Anhe river surface water, sediment and river soil, vegetation most have been polluted by heavy metal, content of Cu, Zn, Pb, Cd, Cr from upstream to downstream showed accumulation.(2)Cu, Zn, Pb, Cd, Cr in water were mainly in soluble form;5kinds of heavy metals in sediments and soils in the exchangeable and weak acid extraction ratio is higher, the two forms of migration and transformation of heavy metals and control are closely related, and affects directly the size of heavy metal toxicity, visible. River channel sediment, soil has strong direct harm.(3)By using a comprehensive pollution index method, index of geoaccumulation, potential ecological risk index, Nemerow comprehensive index method to evaluate the heavy metal pollution river water, sediment, soil, vegetation in the channel, the pollution degree of heavy metals in water:Pb>Cd>Zn>Cu>Cr; the pollution degree of heavy metals in soils and sediments:Cd>Zn>Pb>Cu>Cr; Leymus chinensis, Artemisia degree of heavy metal pollution: Pb>Cd>Cr>Cu>Zn. And in addition to the control points, each sampling point basically reached the level of heavy pollution.