ENVIRONMENTAL GEOCHEMISTRY RESEARCH ON THE REGIONAL BACKGROUND VALUE OF ARSENIC IN WATER AND ITS POLLUTION IN HUANGSHI,HUBEI PROVINCE

By systematic analysis of each type of water bodies and water pollution in the intermountain basin in Huangshi,where copper deposits are concentrated,we obtain the results as follows.1)The content of As in each type of water bodies is fluctuated between 0.52 and 5.46 μg/L,which represents the characteristics that the Cu-rich region is with high As background water bodies.2)The regional geological setting is the chief factor affecting the background value of As in each type of water bodies,among which the water bodies in the clasolite areas contain relatively higher As,with acidic to neutral pH value (6.15-7.14) and high electrical conductivity (R:600-1860 μΩ^-1).3)The water pollution in the region includes natural pollution and artificial pollution.The former is in the water from the skarn orebody(mineralization)in the contact zone between the Mesozoic acid-intermediate rock body and carbonatite and the coal measures of Permian Liangshan group and Longtan group;while the latter is the waste water from dressing plants,chemical plants and nonferrous metal smelteries.4)The different pollution sources vary in the total As contents,the element assemblages,and the physical and chemical characteristics(pH,E_c ets.).