Yin H B, Fan C X, Ding S M, Zhang L, Li B
Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, People's Republic of China.
Bull Environ Contam Toxicol. 2008 Apr;80(4):351-5. doi: 10.1007/s00128-008-9387-8. Epub 2008 Mar 15.
There were similar distribution characteristics for acid volatile sulfides (AVS) and simultaneously extracted metals (SEM) in surface sediments, and the concentrations of AVS and SEM decreased from the deposition area to the center of the bay (lake). The ratio of AVS to SEM was <1 in the surface sediments, indicating that heavy metals in surface sediments may be bioavailable. The concentration of AVS increased with sediment depth, followed by a decrease with large variation, while the concentration of SEM remained constant. By comparing the concentration of SEM with total metals, it was shown that extracted Cu and Ni decreased with sediment depth, indicating increasing association of Cu and Ni with sulfides in deeper sediment layers. The lower extracted ratios for Pb and Zn compared with sulfidic sediment illustrated that AVS should not have strong control on sediment Pb and Zn. The molar ratio of AVS and reactive iron showed that heavy metals were dynamic and active in sediments in this lake.
表层沉积物中酸挥发性硫化物（AVS）和同步提取金属（SEM）具有相似的分布特征，且AVS和SEM的浓度从沉积区向海湾（湖泊）中心降低。表层沉积物中AVS与SEM的比值<1，表明表层沉积物中的重金属可能具有生物可利用性。AVS的浓度随沉积物深度增加，随后大幅下降，而SEM的浓度保持不变。通过比较SEM与总金属的浓度，结果表明，随着沉积物深度增加，提取的铜和镍减少，这表明在较深的沉积层中，铜和镍与硫化物的结合增加。与硫化物沉积物相比，铅和锌的提取率较低，这表明AVS对沉积物中铅和锌的控制作用不强。AVS与活性铁的摩尔比表明，该湖泊沉积物中的重金属具有动态性和活性。
