广西山口红树林生态自然保护区海域沉积物重金属污染状况及潜在生态风险评价

为了解山口红树林生态自然保护区海域沉积物重金属的污染特征,于2018年1-8月采集表层沉积物,分析了沉积物中Cu、Zn、Pb、Cd、Cr、Hg、As的含量。采用单因子污染指数评价法和潜在生态风险指数法进行重金属污染现状和生态风险评价。根据《海洋沉积物质量》GB18668-2002一类标准评价结果,干季、湿季超标的环境因子均为油类、有机碳、硫化物,其余环境因子均小于1,有较大的环境容量。根据潜在生态风险评价结果,干季、湿季各站位重金属综合潜在生态风险指数均小于150,沉积物重金属的潜在生态风险程度较轻,属于低风险范畴。

Heavy metal pollution and potential ecological risk assessment of sediments in Shankou mangrove ecological nature reserve,Guangxi

In order to understand the pollution characteristics of heavy metals in the sediments of Shankou mangrove ecological nature reserve,the surface sediments were collected from January to August 2018,and the contents of Cu,Zn,Pb,Cd,Cr,Hg and As in the sediments were analyzed.Single factor pollution index and potential ecological risk index were used to evaluate the current situation and ecological risk of heavy metal pollution.According to the assessment results of class I standard gb18668-2002 of marine sediment quality,the environmental factors exceeding the standard in dry and wet seasons are oil,organic carbon and sulfide,and the other environmental factors are all less than 1,with large environmental capacity.According to the results of potential ecological risk assessment,the comprehensive potential ecological risk index of heavy metals in dry and wet seasons is less than 150,and the potential ecological risk degree of heavy metals in sediment is relatively light,which belongs to the category of low risk.