Heavy Metal Pollution Characteristics of Manganese Ore Tailings and Surrounding River Sediments in Eastern Guizhou
Heavy metal pollution in the surrounding environment caused by mining activities has been concerned by the society and the government.Taking a manganese ore tailing dumping site located in the eastern region of Guizhou Province as the research object,this paper examines the sediments found in the manganese ore tailings and surrounding rivers.The concentration of heavy metals(Cr,Pb,Cu,and Mn)is measured by using an atomic absorption spectrophotometer.Heavy metal pollution is assessed through the single factor pollution index(Pi)method and sediment quality standards(SQGs)method.The study revealed that Mn and Cu in the tailings are the main contributors to environmental pollution,with Cu having the most frequent negative effects on benthic organ-isms in sediments.Additionally,Mn and Pb could also have adverse impacts.Based on the correlation of heavy metals in sediments and the field investigation in the study area,it is concluded that heavy metals in sediments mainly come from manganese ore tailings,rock weathering and human activities according to the principal com-ponent analysis(PCA)results.Research indicates that the indiscriminate disposal of manganese ore tailings in are-as with high carbonate geological backgrounds has led to contamination of surrounding water sediment.The ad-sorption and desorption of heavy metals in the sediments will occur under different pH values,interaction of heav-y metals and human interference,which may pose a threat to the water environment.Therefore,it is crucial to consider the impact of manganese ore tailings on water sediments in their treatment.
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