Occurrence and Ecological Risk Assessment of Heavy Metals(Metalloids)in Manganese Gangue in Songtao Typical Manganese Ore Area of Tongren,Guizhou
In order to reveal the distribution characteristics and potential ecological risks of heavy metals(metalloids)in manganese gangue,this paper took manganese gangue from Songtao typical manganese ore areas in Tongren City as the research object,and analyzed the total amount and occurrence form of heavy metals(metalloids)of Mn,Pb,As,Cr,Ni,Cu,Zn and Cd,and discussed the potential pollution risk of heavy metals based on risk assessment coding(RAC)and ratio of secondary phase to primary phase(RSP).The contents of Mn and As in gangue were 3 820-138 500 mg/kg and 21.3-72.8 mg/kg,respectively;which were 7.96-243.80 and 1.20-4.11 times higher of the soil geochemical background values of Tongren,respectively.And the content of other heavy metals(metalloids)was lower than or similar to that of their background value.BCR analysis showed that the proportion of weak acid extracted fraction and available fraction of Mn were 7.84％-39.53％and 92.34％-98.83％,respectively,which were the highest in mangangue gangue.RAC and RSP showed that Mn was the main environmental and ecological risk influencing factor,and had the highest risk level;Cd,Ni,Cu,Pb and Zn were at medium to low contamination risk level in most samples.
heavy metals(metalloids)occurrencemanganese gangueTongren
NETL
NSTL
万方数据
