湘潭锰矿区重金属污染的空间分布研究

Study on Spatial Distribution of Heavy Metals Pollution in Manganese Mine Land

以锰矿区旱土和底泥为研究对象,探索了研究区内Mn、Pb、Cu、Zn、As的空间分布特征和相关关系。结果表明,样点中Mn、Pb、Cu、Zn、As含量均超过湖南省土壤背景值。单因子指数表明旱土中Mn为中度污染,As、Zn、Cu为轻度污染,Pb为清洁水平;底泥中Mn、As、Cu为轻度污染,Pb、Zn为清洁水平。锰矿区Mn、Pb、Zn空间分布情况较相似,呈以锰尾渣堆为中心逐步向四围递减的放射状,Cu、As空间分布呈以某块区域为中心向西北方向逐步递减。

The upland soils and sediment at Manganese ore area in Xiangtan were selected to study the spatial distribution characteristics and correlation of five typical heavy metals(Mn,Pb,Cu,Zn and As).The conclusions indicated that the concentrations of Mn,Pb,Cu,Zn,As exceed the background value of Hunan province respectively.The single-factor index indicated that Mn was moderately pollution,As,Zn and Cu were slightly pollution,and Pb was clean level in upland soil;Mn,As and Cu were slightly pollution,Pb and Zn were clean level in sediment.The ArcGIS spatial distribution maps showed that Mn,Pb and Zn had the similar features,which orientated radially from the central part of manganese tailings' dumping lands gradually decrease to all around.The spatial distribution of Cu and As orientated from a key point and gradually decreased along the northwest of the manganese mine land.