摘要
为了研究金矿区土壤重金属元素污染的生物效应,在研究区(亦称土壤污染区)和对比区采集不同蔬菜样品,分析其中重金属元素质量分数,结果表明:污染区内蔬菜中Hg、Pb、Cd、Cr、As的质量分数明显高于对比区;依据食品中污染物限量标准,蔬菜中Hg、Pb、Cd的超标倍数较大,分别为20.37、6.99、0.90,超标倍数均值顺序为Hg>Pb>Cd,As、Cr和Cu不超标;污染区内蔬菜中Hg、As、Cu质量分数均值呈现为叶菜类大于果实类大于块根类,Pb、Cd、Cr表现为叶菜类大于块根类大于果实类;不同品种蔬菜中重金属的吸收富集能力不同,油麦菜、青菜、萝卜叶、韭菜显著富集Hg、Pb、Cd,受污染程度较为严重。
In order to investigate the biological effects of soil pollution in a gold mining area, vegetable samples were collected from polluted areas of heavy metals and unpolluted areas, and the mass ratios of heavy metals in the samples were analyzed. Results show that the contents of Hg, Pb, Cd, Cr and As in the samples from polluted areas are distinctly higher than those from unpolluted areas. According to the standard of food sanitation limit, the superscale multiples of Hg, Pb, Cd in vegetables are 20. 37, 6.99 and 0. 90, respectively, and the order of the average superscale multiples is Hg〉Ph〉Cd, but the As, Cr and Cu does not exceed the standard values. The average contents of Hg, As and Cu in vegetables in the study area is leafy〉fruit category〉root class, and the average contents of Pb, Cd and Cr is leafy〉root class〉fruit category. Different vegetables have different absorption abilities to heavy metals,and greengrocery, Chinese cabbage, radish leaves, and leek have a great absorption ability to Hg, Pb and Cd, therefore, they have been heavily polluted.
出处
《地球科学与环境学报》
CAS
2008年第4期425-428,441,共5页
Journal of Earth Sciences and Environment
基金
陕西省自然科学基金项目(2006D20)
中国地质调查局项目(200412300057-1)
关键词
金矿区
蔬菜
重金属
污染评价
gold mining area
vegetable
heavy metal
polluting evaluation
