Hsu P, Matthäi A, Heise S, Ahlf W
Institute of Environmental Technology and Energy Economics, Technical University Hamburg-Harburg, Eissendorfer Strasse 40, 21073 Hamburg, Germany.
Environ Pollut. 2007 Aug;148(3):817-23. doi: 10.1016/j.envpol.2007.01.026. Epub 2007 Mar 26.
Contaminated sediment in the river basin has become a source of pollution with increasing importance to the aquatic ecosystem downstream. To monitor the temporal changes of the sediment bound contaminants in the River Elbe and the River Dommel monthly toxicity tests were applied to layered sediment and river water samples over the course of 10 months. There is an indication that contaminated sediments upstream adversely affected sediments downstream, but this process did not cause a continuous increase of sediment toxicity. A clear decrease of toxic effects in water and upper layer sediment was observed at the River Elbe station in spring related to high water discharge and algal blooms. The less obvious variation of sediment toxicity in the River Dommel could be explained by stable hydrological conditions. Future monitoring programmes should promote a more frequent and intensive sampling regime during these particular events for ecotoxicological evaluation.
流域内受污染的沉积物已成为一种污染源，对下游水生生态系统的重要性日益增加。为监测易北河和多梅尔河中与沉积物结合的污染物的时间变化，在10个月的时间里，对分层沉积物和河水样本进行了每月一次的毒性测试。有迹象表明，上游受污染的沉积物对下游沉积物产生了不利影响，但这一过程并未导致沉积物毒性持续增加。春季时，易北河监测站的水和上层沉积物中的毒性效应明显降低，这与高流量和藻类大量繁殖有关。多梅尔河沉积物毒性变化不太明显，这可能是由于水文条件稳定。未来的监测计划应在这些特殊事件期间推行更频繁、更密集的采样方案，以进行生态毒理学评估。
