Heavy metal contamination and accumulation in soil and dominant plants from Lanmuchang mercury-thallium mine area
In order to screen suitable plants for ecological environment remediation of heavy metal in Lanmuchang mercury-thallium mine area,the contents of Mn,Ni,Cu,Zn,As,Pb,Cr,Cd,Hg and Tl in the rhizophere soils and native dominant plants were determined by isotope dilution/inductively coupled plasma mass spectrometry(ID/ICP-MS).The heavy metal contaminations of the rhizophere soils,bioaccumulation and translocation of the heavy metals in plants were evaluated by enrichment factor(EF),bioconcentration factor(BCF)and biological translocation factor(BTF).EF evaluation results showed that the rhizosphere soils were extremely enriched by Hg and Tl,strongly enriched by As,slightly enriched by Cu,not enriched by Pb,Zn,Cr,Cd,Mn and Ni.Based on BCF and BTF,the following results were obtained:Dicranopteris dichotoma was Mn,Zn and Cd accumulator plant,Betula utilis was Mn,Ni and Zn accumulator plant,Osmundastrum cinnamomeum was Mn,Cd and Tl accumulator plant,Imperate cylindrica was Mn and Ni accumulator plant,and Pteris vittata was As hyperaccumulator plant;Betula utilis was Cd root-hoarding plant,Dicranopteris dichotoma was Ni root-hoarding plant,Osmundastrum cinnamomeum was Ni and Zn root-hoarding plant,Imperate cylindrica was Zn and Cd root-hoarding plant,Festuca rubra was Mn,Zn and Cd root-hoarding plant,and Aritemisia indica was Cd and Tl root-hoarding plant;Miscanthus sinensis and Senecio scandens were excluder plants.The soils of study area were in severe Tl-Hg-As combined contamination.Pteris vittata could be used as a remediation plant for As-contaminated soil in the study area,Osmundastrum cinnamomeum used as a remediation plant and Aritemisia indica used as a phytostabilization plant for Tl contaminated soil.Miscanthus sinensis and Senecio scandens could be used as vegetation restoration plant in the study area.
万方数据
维普
