深圳湾海域沉积物中酸可挥发性硫化物与重金属生态风险评价

测定了深圳湾海域10个站点表层沉积物中的AVS、TOC和同步浸提重金属(SEM)的含量,对AVS、SEM的平面分布及AVS与SEM和TOC的相互关系进行了分析。结果表明:深圳湾海域表层沉积物AVS含量范围为0.06～7.41μmol/g,平均值为2.51μmol/g;SEM含量范围为0.71～5.15μmol/g,平均值为3.06μmol/g;AVS与SEM的平面分布较一致,呈从湾顶到湾中向湾外逐渐递减的明显趋势。调查海域AVS与SEM和TOC间具有良好的线性相关性,大多数站点∑SEM-AVS的差值均0<(∑SEM-AVS)<5,说明该海域可能存在重金属的中等毒性生态风险。

Assessment on ecological risk of acid-volatile sulfide and tracemetals in marine sediment of Shenzhen Bay

The acid volatile sulfides(AVS),total organic carbon and heavy metals extracted simultaneously(SEM) in 10 surface sediment samples collected from the Shenzhen Bay were analyzed.The plane distribution of AVS and SEM and the relationships between AVS,SEM and TOC were researched.The results showed that AVS in the surface sediment ranged from 0.06 to 7.41 μmol/g with the mean of 2.51 μmol/g,The plane distribution of AVS and SEM was similar,which was decreased gradually from inside to outside of the Bay.SEM in the surface sediment ranged from 0.71 to 5.15 μmol/g with mean of 3.06 μmol/g.The SEM and TOC were linearly related with AVS.The differences of ∑SEM-AVS at most of sample stations were 0<(∑SEM-AVS) <5,which showed that there was a potential ecological risk of heavy metals in the Shenzhen Bay.