西南某矿区土壤重金属污染分布特征与潜在生态风险

Distribution Characteristics and Potential Ecological Risk of Heavy Metal Pollution in Soil of a Mining Area in Southwest China

以广西某矿区周围土壤为研究对象(0cm^20cm),设置59个采样点,测定Sb、As、Zn、Pb、Cd五种重金属含量,采用运用潜在生态风险指数法进行风险评价。结果表明:研究区域整体呈很强生态风险状态,不同方向重金属环境生态风险综合指数大小顺序为:RI北(845.31)>RI西(700.16)>RI东南(506.00)>RI西北(491.61)>RI东北(450.81)>RI西南(395.57)>RI东(385.81),其中重金属Cd、Sb为主要潜在生态风险污染物,潜在风险指数分别为369.41、117.23。

Taking the soil around a mining area in Guangxi as the research object(0 cm^20 cm),59 sampling points were set up to determine the contents of Sb,As,Zn,Pb and Cd.The potential ecological risk index method was used to evaluate the risk.The results showed that the overall ecological risk status of the study area was very strong.The order of the comprehensive index of environmental ecological risk of heavy metals in different directions was:RINorth(845.31)>RIWest(700.16)>RI Southeast(506.00)>RI Northwest(491.61)>RI Northeast(450.81)>RI Southwest(395.57)>RI East(385.81).Heavy metals Cd and Sb were the main potential ecological risk pollutants,and the potential risk was referred to as the potential risk.The numbers were 369.41 and 117.23,respectively.