摘要
通过对比研究小秦岭某金矿区土壤重金属综合污染区和对比区内的小麦、玉米籽粒中重金属的含量,结果表明污染区内小麦籽粒中汞、铅、镉累积程度显著高于土壤对比区对照样,铬、砷、铜、锌与对照区几乎没有差异,汞、铅、镉、锌、铜的超标率分别为86.67%、60%、33.33%、6.67%、20%。在污染区,玉米中铅、镉、铬较对照区明显累积,但仅有汞超标,超标率为15.15%。同一采样地点,金矿区小麦籽粒比玉米更易吸收累积重金属。小麦中重金属含量与立地土壤重金属污染程度存在较好的相关性。与1990年比较,小麦中汞、镉累积效应非常显著。研究区土壤重金属污染已经造成了小麦严重污染。
A comparative study was performed of the content of heavy metals in wheat and heavy metal pollution and a control area in a certain gold mining area in the Xiaoqingling corn in an area of soil Mountains. The study shows that： the cumulative contents of Hg, Pb and Cd in wheat seeds in the polluted area are obviously higher than those in the soil control area; there is almost no difference in contents of Cr, As, Cu and Zn between the polluted area and control area; and the above-standard rates of Hg, Pb, Cd, Zn and Cu in wheat are 86.67%, 60%, 33.33%, 6.67% and 20% respectively. In comparison with the control area, the Pb, Cd and Cr contents m corn in the polluted area are markedly high but do not exceed the set standards, only mercury being above the standard, with an above-standard rate of 15.15%. Wheat is easier to absorb heavy metals than corn at the same sampling site. There is a good correlation between the content of heavy metals in wheat and the degree of heavy metal pollution in soils. In contrast with 1990, the cumulative effects of Hg and Cd in wheat are very prominent. The heavy metal pollution of soils in gold mining area has caused serious pollution of wheat.
出处
《中国地质》
CAS
CSCD
2007年第4期716-722,共7页
Geology in China
基金
中国地质调查局地质大调查项目(200412300057)资助。
关键词
小麦
玉米
重金属
污染分析
wheat
corn
heavy metal
pollution analysis
assessment
gold mining area
