湖南桂阳某矿区周围稀土地球化学特征评价

Evaluation of Rare Earth Geochemical Characteristics Around a Mining Area in Guiyang,Hunan Province

研究发现,周围环境中,稀土元素可以从植物、动物、水体和空气等多种途径进入人体,而过量的稀土元素进入人体会增加致癌风险。分析矿区周围稀土元素含量和特征可为矿区生态环境提供参考依据。对湖南某矿区周围土壤中的La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Y元素浓度进行测量研究,结合单因子指数法和内梅罗综合污染指数法进行分析。数据表明,土壤样品中的稀土平均含量为261.63 mg/kg,是湖南土壤背景值163.86 mg/kg的1.60倍,说明矿区周围出现稀土富集情况。单因子指数结果显示,各稀土元素单项污染指数均呈现不同程度污染,内梅罗综合污染结果显示中度污染样品占比28%,其余样品均为轻度污染,说明矿区早期采矿等人为活动将深层稀土元素带到表层富集,存在一定的污染,需要警惕。

In the surrounding environment,rare earth elements can enter the human body from plants,animals,and water and air,etc.Excessive rare earth elements into the human body will increase the risk of cancer.The analysis of the contents and characteristics of rare earth elements around the mining area can provide reference for the ecological environment of the mining area.The study measures and analyzes the concentrations of elements La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu and Y in the soil around a mining area in Hunan with single factor index method and Nemero comprehensive pollution index method.The data show that the average content of rare earth in the soil samples is 261.63 mg/kg,which is 1.60 times of the Hunan soil background value of 163.86 mg/kg,indicating that there is rare earth enrichment around the mining area.The results of single factor index show that the single pollution index of each rare earth element present different levels of pollution.The comprehensive pollution result of Nemero show that 28%of the samples are moderately polluted,and the rest are mildly polluted,indicating that human activities,such as early mining in the mining area has brought deep rare earth elements to the surface for enrichment.There is some pollution,which needs special attention.