攀钢冶炼渣堆土壤与优势植物的重金属含量

采用原子吸收分光光度法测定攀钢西渣场冶炼渣堆土壤和6科12种优势植物中Mn、Pb、 Ni、 Cu、Cd等5种重金属含量,并计算优势植物对重金属的富积系数和转移系数.结果表明:渣堆土壤中重金属含量Mn最高(3869.14 mg/kg),次后顺序为Pb>Ni>Cu>Cd;植物与土壤的重金属分布基本一致;所测优势植物中,多数植物对重金属的富积系数较低,而转移系数却较高,如天名精对Cu的转移系数为5.1,羽芒菊对Pb转移系数为3.3,五月艾对Cd的转移系数为6.0,其中8种植物(天名精、羽芒菊等)对Mn的转移系数均大于1.该结果为重金属污染土壤的植物修复提供了参考物种,同时也为植物重金属耐受机制的研究提供了筛选对象.

The concentration of heavy metals in soil and dominant plants growing on spoiled heap from steel refinery

The concentration of five kinds of heavy metals (Mn, Pb, Ni, Cu, and Cd) in soil and 12 species of plants, belonging to 6 families and growing on spoiled heap from steel refinery in Panzihua, was measured with atomic absorption spectrophotometry, the bio-accumulation coefficient (AC) and bio-transfer coefficient (TC) of these plants to heavy metals were further calculated. We found that the content of Mn in spoiled heap soil (up to 3869.14 mg/kg) was highest in five heavy metals, and the next in order was Pb> Ni > Cu >Cd. There was similar distribution of the five heavy metals both in plants and in soil. The value of AC of the tested dominant plants to heavy metals was low, however the value of TC relative high. The value of TC of Carpesium abrotanoides L. to Cu, Tridaxprocumbens L. to Pb, and Artemisia indica Willd to Cd, was 5.1, 3.3 and 6.0, respectively. Furthermore, the value of TC to Mn in 8 out of 12 species of plants exceeded 1. Our results provide reference species for greening and purifying for heavy metals spoiled soil, and offer selected objects for investigate the mechanism involving in tolerance of plants to heavy metals.