摘要
采集吉林省红旗岭镍矿区受尾矿库影响程度不同的耕层土壤样品,评价土壤重金属的污染现状及采用风险评价编码法(RAC)和次生相与原生相分布比值法(RSP)对重金属生物有效性进行评估。单因子污染指数分析结果表明:研究区域离尾矿库距离较远的土壤样品污染指数均<1,处于尚清洁水平;离尾矿库距离较近的土壤样品中Ni和Cd的污染指数均>3.0,处于重度污染水平。综合污染指数分析结果显示:研究区域受离尾矿库距离较远的土壤样品污染指数均<0.7,处于安全级别;离尾矿库距离较近的土壤样品污染指数均>3.0,处于重度污染级别。Tessier连续提取分析结果显示:Cr和Pb残渣态含量均高于其他形态的含量;Cu主要以残渣态和有机结合态为主;Zn主要以残渣态和铁锰氧化物结合态为主;Ni和Cd的可交换态和碳酸盐结合态含量较高。土壤pH、有机质含量和土壤重金属总量3个因素中,土壤重金属总量是影响矿区土壤重金属形态分布的主要因素。结合RAC和RSP,表明镍矿区Ni和Cd生物有效性和环境风险较高。
Surface soil samples with different degrees of impact from tailing ponds were collected from Hongqiling nickel mining area,Jilin province,to evaluate the pollution status of heavy metals in the soil,and the bioavailability of heavy metals was evaluated by risk assessment code method(RAC)and secondary phase to primary phase distribution ratio method(RSP).The results of single-factor pollution index analysis showed that the pollution indexes of soil samples far from the tailing pond in the study area were less than 1,which is at a relatively clean level;the pollution indexes of Ni and Cd in the soil samples close to the tailing pond were both greater than 3.0,indicating a high level of pollution.The comprehensive pollution index analysis results showed the pollution index of soil samples far from the tailing pond in the study area were less than 0.7,which is at a safe level;The soil samples close to the tailing pond had pollution indexes greater than 3.0,indicating a severe pollution level.The results of Tessier continuous extraction analysis showed that the residual content of Cr and Pb was higher than that of other states.Cu was mainly in residual and organically bound states;Zn was mainly in the residual state and the combined state of iron and manganese oxides:The exchangeable and carbonate bound states of Ni and Cd were relatively high.Among the three factors of soil pH,organic matter content and total amount of heavy metals in the soil,the total amount of heavy metals in the soil was the main factor affecting the distribution of heavy metals in the soil in the mining areas.The combination of risk assessment coding method(RAC)and secondary phase to primary phase distribution ratio method(RSP)indicates that Ni and Cd were of high bioavailability and environmental risk in nickel mining areas.
作者
黄帆
赵兴敏
李明堂
焦帅
HUANG Fan;ZHAO Xingmin;LI Mingtang;JIAO Shuai(College of Resources and Environment,Jilin Agricultural University,Changchun 130118,China)
出处
《吉林农业大学学报》
CAS
CSCD
北大核心
2024年第1期131-139,共9页
Journal of Jilin Agricultural University
基金
国家重点研发计划项目(2018YFD0300201)。
关键词
镍矿区
重金属
污染评价
形态分布
生物有效性
吉林省
nickel mine area
heavy metal
pollution assessment
fraction distribution
bioavailability
Jilin province
