粤东北银锑矿尾矿区周边土壤重金属污染评价

对粤东北银锑矿尾矿区周边土壤的理化性质、重金属含量及其与理化性质相关性分析的基础上，应用Hakanson潜在生态危害指数对其危害程度进行评价。结果表明:矿区土壤呈酸性，pH3.40~6.94，土壤相对较贫瘠；土壤重金属污染以Cd污染为主，Cd含量为0.31~2.66 mg·kg^-1(平均含量为1.11 mg·kg^-1)，严重超标；从总潜在生态危害指数看，各样点均界于50≤RI＜300之间，属中污染；土壤理化性质及其与土壤重金属污染间存在不同程度的相关性，其中，距离与pH呈显著正相关，pH与交换性酸、与Cd分别呈显著、极显著的负相关；Cu与Ni含量呈显著正相关。

Assessment and Correlation Analysis of Heavy Metals Pollution in Northeastern Guangdong Ag-Sb Deposit

In order to find out the status of soil heavy metal pollution in Northeastern Guangdong Ag-Sb deposit, based on the analysis of soil physicochemical properties, heavy metal content and correlation between chemical properties, the ecological hazard levels were evaluated by using the Hakanson potential ecological hazard risk index. The results indicated that the soil was acidic (pH 3.40-6.94), and the soil fertility was relatively poor. The heavy metal pollution was mainly from Cd, the contents of Cd in soil were from 0.31 to 2.66 mg·kg^-1, with an average of 1.11 mg·kg^-1, much higher than the national secondary standard. The values of total potential ecological risk index (RI) were between 50 to 300, and all sampling points belonged to the moderate pollution. Correlations with various degrees were observed between soil physicochemical properties and heavy metal pollution, in which the distance and pH demonstrated significantly positive correlation. pH and exchangeable acids presented significantly positive correlation, while most significantly positive correlation was found between pH and Cd. The correlation between Cu and Ni was significantly positive.