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釩冶煉廠周邊陸生植物對重金屬的富集特征

Phytoaccumulation of heavy metals by terrestrial plants around vanadium smelters

  • 摘要: 對某釩冶煉廠周邊土壤和植被進行現場采樣,共采集到高等植物20科29種,土壤樣品7個,采用ICP-MS和ICPOES分析本土植物和土壤中重金屬含量.結果表明,冶煉廠周邊土壤普遍存在V、Cr和Cd污染現象,重金屬V和Cr的污染問題突出.29種植物體內均檢測到V、Cr、Cd和Pb,其中V含量相對較高.本土植物蜈蚣草體內重金屬V含量最高,其地上部分V積累量為86.51 mg·kg-1,地下部分為814.25 mg·kg-1;野胡蘿卜對Cd的富集和轉運能力顯著高于其他植物,地上部分和地下部分Cd含量分別為18.56 mg·kg-1和5.66 mg·kg-1.兩種植物表現出對釩冶煉導致周邊復合重金屬污染極高的耐性,可作為釩冶煉廠周邊土壤重金屬污染植物修復的先鋒物種.

     

    Abstract: Twenty-nine species samples of higher plants which belong to twenty families and seven soil samples were collected from a vanadium smelter. The contents of heavy metals in the native plants and soil were analyzed by ICP-MS and ICP-OES. The results show that the soil of the smelting plant area has general Cr,Cd and V pollution phenomena; moreover,V and Cr pollution is conspicuous. V,Cr,Cd and Pb are detected from all these collected polluted higher plants,and the content of V is the highest. Pteris vittata L,the native plant,has the highest V content; the accumulation amounts of the aboveground part and the underground part are 86.51 mg·kg-1 and 814.25 mg·kg-1,respectively. The enrichment and transport capacity of Daucus carota L is obviously higher than that of other plants; the accumulation amounts of the aboveground part and the underground part are 18.56 mg·kg-1 and 5.66 mg·kg-1,respectively. These two kinds of plants show high tolerance to heavy metal pollution in the vanadium smelting plant area,and they can be used as pioneer species of pollution remediation.

     

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