Research On The As Contamination Characteristics Of The Mine Water Environment

The discharge of Arsenic（As） during the coal combustion and Arsenic’s long-termaccumulation in the environment are the main reasons of Arsenic pollution and hazard.In someparts of our country,people use the behindhand exploitation modes or processing technics whichmade the mining digging area’s environment getting worse and worse. Meantime,a lot of minerefuse and mullock、rubbish water will exhaust many poisonous harmful substance to theenvironment to influence people’s healthy who living in the mine area beside of destroying thelocal ecological environment. So,doing the research of mine area Arsenic pollusion influencingfactors and morphological analysis is very meaningful to mine area Arsenic pollution control.This text bases on one mine area of Inner Mongolia,based on the system sampling analysisof it’s river water、mine water、sediment deposition, study the water’s chemical features、Arsenic’sdistribution characteristic in the water environment and it’s resource,study Arsenic’s distributioncharacteristic and regular pattern in the sediment,then come to investigate Arsenic’s chemicalevolution processing in this area.The general consistence scope of As in the water is about0.01-0.09mg/L,the average valueis0.04mg/L,of which As（III）’s percentage composition is10.79-49.37%,respectively As（V） andparticulate form are18.61-49.37%and0.92-31.03%.Compared to GB3838-2002,76%of samplepoints have no overproof.The consistence of As in the river water is lower than in the mine waterwhile there is a positive relationship between As and Fe、Al、Mn because of the sorption.Totally,they can be separated into five kind of water-style quality via the chemicalresearch:HCO₃-SO₄-Ca、 SO₄-Ca、 SO₄-Ca-Mg、 HCO₃-Ca、 HCO₃-SO₄-Ca、HCO₃-SO₄-Na-Ca-Mg.Among them,there are about31.6%is the HCO₃-SO₄-Ca、about36.8%are SO₄-Ca-Mg.Generally speaking,the pH values of mine water are on the low side while theriver water is getting higher as it is farer away from the mine.There is a obvious negativecorrelation between SO₄and water pH value,pH value is on the low side in the mine water,so theSO₄dissolve from the gypsum horizon while the consistence getting lower in the river waterbecause of the reaction between SO₄and Ca.In the mine water,SO₄has a positive correlationwith Fe、Mn、Al’s consistence but it is not obvious in the river water.The consistence scope of As in the sediment is about6.04-13.77mg/kg,average value is9.7mg/kg,all of them are over the local soil background level.The average value of water pH is 7.56and the average value of electrical conductivity is9.3ms/cm.