摘要
为评估降水条件下矿区重金属再迁移特征,本文以广东大宝山地区土壤和尾矿样品为研究对象,在近中性条件下进行了淋滤实验,分析了重金属元素的溶出规律。结果表明:土壤样品中重金属离子淋出量显著小于尾矿中重金属离子淋出量;土壤和尾矿样品的淋滤规律基本相同,重金属离子实验初始溶出速率较快,随着时间的延长,溶出量逐渐下降,在100h左右时达到稳定;从淋滤曲线得出重金属元素的淋失顺序为:Fe>Cu>Zn>Tl>Pb>Cd。年淋失量分析表明,在自然雨水的作用下,大量的重金属离子从尾矿等固体物质中淋失到当地河流、地下水系中,对当地居民生活造成严重的危害。
In order to understand the remigration characteristics of the heavy metals in mining ar- eas under the conditions of precipitation, soil and mine tailing samples were collected from the Dabaoshan mining area of northern Guangdong, and a leaching experiment was conducted under neutral conditions to analyze the release patterns of heavy metals. The leached amount of the heavy metals from soils was significantly smaller than that from the mine tailings, but the leaching patterns were similar. At initial stage, the heavy metals leached out rapidly, but with the increas- ing time, the leached amount decreased, and reached to a stable state at the time around 100hours. The leaching rate of the heavy metals was in the order of Fe〉Cu〉Zn〉TI〉Pb〉Cd. The analysis of annual leaching rates showed that under the action of natural precipitation, great amount of heavy metals in the soils and mine tailings would leach to the local rivers and under- ground water systems, and seriously endanger the local residents.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第4期1038-1044,共7页
Chinese Journal of Ecology
基金
中国地质大调查项目(1212011120993)
上海市教委基金项目(12YZ017)资助
关键词
重金属
风化淋滤
大宝山
heavy metal
weathering leakage
Daobaoshan.
