Zoumis T, Schmidt A, Grigorova L, Calmano W
Department of Environmental Science and Technology, Technical University of Hamburg-Harburg, Germany.
Sci Total Environ. 2001 Feb 5;266(1-3):195-202. doi: 10.1016/s0048-9697(00)00740-3.
In this study, the contaminated anoxic sediment of the Mulde reservoir (Saxony, Germany) was investigated. Several sediment cores were analysed for heavy metals and organic chemicals such as chlorobenzenes and DDTs. The comparison between anoxic and oxidised sediment cores showed the potential danger for heavy metal (Zn and Cd) remobilisation from sediment due to bioturbation or resuspension by flooding. Chemical sequential extraction was used to describe partitioning of heavy metals among different mineralogical components in the sediments. Results showed remobilisation of Zn and Cd from the sediments. The stable fraction (organic/sulfidic-bound) of Zn and Cd decreased from 10 to 3%, and from 35 to 5%, respectively. Simultaneously, the carbonate fraction increased from 3 to 12% for Cd and from 10 to 22% for Zn. Furthermore, the simulation of the diffusion of organic pollutants showed remobilisation of 1,4-dichlorobenzene. The results confirmed the necessity of sediment remediation in the reservoir. Capping seems to be a promising approach for a low-cost remediation.
在本研究中，对穆尔德水库（德国萨克森州）受污染的缺氧沉积物进行了调查。分析了多个沉积物岩芯中的重金属以及氯苯和滴滴涕等有机化学品。缺氧和氧化沉积物岩芯之间的比较表明，由于生物扰动或洪水导致的再悬浮，沉积物中的重金属（锌和镉）有重新活化的潜在危险。采用化学顺序提取法来描述沉积物中不同矿物成分间重金属的分配情况。结果显示沉积物中的锌和镉发生了重新活化。锌和镉的稳定部分（有机/硫化物结合态）分别从10%降至3%，从35%降至5%。同时，镉的碳酸盐部分从3%增至12%，锌的碳酸盐部分从10%增至22%。此外，有机污染物扩散模拟显示1,4 - 二氯苯发生了重新活化。结果证实了对该水库沉积物进行修复的必要性。覆盖似乎是一种有前景的低成本修复方法。
