酸溶硫化物与沉积物中重金属化学活性的关系

Relationship between acidvolatile sulfide andchemical activity of heavy metals in sediment

通过Ｃｕ、Ｐｂ、Ｚｎ、Ｃｄ、Ｎｉ、Ｃｏ的沉积物加标实验以及膜渗透平衡交换间隙水采样技术，探讨了间隙水中重金属浓度对不同加标量的沉积物化学响应关系和重金属在沉积物—间隙水两相间的地球化学分配机制。研究结果表明：在硫化物存在条件下，重金属在固、液两相间的分配主要受酸溶硫化物（ＡＶＳ）影响，ＡＶＳ决定了沉积物中重金属的化学活动性。

The relationship between the concentrations of the heavy metals in the porewater and sediment with different concentrations of added heavy metals was discussed. The porewater was sampled through the membrane penetrating equilibrium. The geochemical partitioning mechanism between the sediment and porewater was studied. It showed that the partition of the heavy metals between solidliquid phase was mainly affected by acidvolatile sulfide (AVS) with sulfide in the sediment. AVS controlls the chemical activity of the heavy metals in the sediment. Using AVS normalization heavy metals was the effective method to predetermine and evaluate their partition in sediment.