广州城市河涌沉积物浸出液对水生生物的急性毒性

研究了广州市石井河、澳口涌、沙河涌、东朗涌、车陂涌、花地涌6条河涌沉积物浸出液对小球藻、大型和斑马鱼的急性毒性.试验结果表明,6条河涌沉积物浸出液对水生生物均存在不同程度的毒性,其中石井河和澳口涌毒性较大.对于河涌沉积物污染的生物检测,小球藻生长抑制率指标比大型和斑马鱼存活率指标具有更高的敏感性和指示性,其顺序表现为小球藻>斑马鱼>大型.沉积物会构成河流的一个持久性污染源而对水生生物造成危害.在治理河涌的过程中,河涌沉积物的二次污染不可忽视.氵搔氵搔氵搔

Toxicity of the Lixivium of the Sediment from 6 Streams of Guangzhou to Aquatic Organisms

The acute toxicity of the lixivium of the sediments from 6 streams,including Shijing, Aokouyong, shaheyong, Donglangyong, Chebeiyong and Huadiyong to Chlorella pyrrenoidosa, Daphnia magna and Brachydanio Rerio were assessed. Results indicated that the lixivium of the sediments from the 6 streams displayed different toxicities to aquatic organisms. Among 6 streams, the toxicity of the lixivium from Shijing and Aokouyong streams were stronger than others. In the bioassay of the sediment from different streams with various level organisms,Chlorella pyrrenoidosa exhibited the most sensitivity to lixivium of the sediment and Daphnia magna was the least.