矿山重金属污染土壤的磁化率特征及其意义——以广东大宝山多金属矿床为例

以广东省大宝山多金属矿区作为重金属污染土壤磁化率监测指标的探索研究。选择两个尾矿库、尾矿废水汇入河流的上游土壤、中游土壤以及未污染土壤分别进行磁化率测试。发现在尾矿库中,细粒沉积物中磁化率值高于粗粒,重金属污染土壤的磁化率显著高于未污染土壤。在污染河流沉积物和土壤剖面,随沉积物从土壤向底部粗砂过渡,下部粗粒沉积物的磁化率大于上部土壤,这一变化特征说明大宝山地区的原生污染可能更为严重。研究证明磁化率可以作为土壤重金属污染监测的替代性指标。

The Magnetic Susceptibility Characteristics and its Significance of Heavy Metals Polluted Soils in Mine Area——A case study in Dabaoshan polymetallic ore deposit,Guangdong

Magnetic susceptibility of sediments as an effective proxy of evaluating the heavy metals pollution has been proved.The soils of Dabaoshan polymetallic ore deposit area was taken an example to study how the magnetic susceptibility(K) responses to heavy metals pollution.Susceptibility value,measured on Tielong gangue storeroom,Caoduikeng gangue storeroom,soil of pollution upriver,middle river and unpolluted soil respectively,was higher in fine sediments(soil) than coarse sediments(soil),polluted soil by heavy metals also higher than unpolluted. In the section of polluted river sediments(or soil),the susceptibility of top layer is less than the bottom,but the grain size more coarse than top.This shows that the original pollution is very important in the Dabaoshan area,and the susceptibility can indicate the heavy metals pollution of soils.