ECOTOXIC EFFECTS OF WET WEATHER DISCHARGES IN AN URBAN STREAM
ECOTOXIC EFFECTS OF WET WEATHER DISCHARGES IN AN URBAN STREAM
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城市河流中潮湿天气排放的生态毒性效应
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
F. Nakajima
中科院分区：
文献类型：
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作者：
Anders Baun;A. M. Christensen;F. Nakajima
城市流存储Vejlea（丹麦），它接收城市径流的排放，进行了调查，使用生物毒性试验（biotests）和化学分析相结合。城市雨水和道路径流并没有影响大型蚤的动员，而三个样品给低，但统计学上显着的，影响的繁殖的Pseudokirchneriella subcapitata。在所有预浓缩的水样中，发现了毒性效应，EC 10值范围为预浓缩系数的1.7 - 43倍，并确定了取决于取样时间和地点的毒性差异（例如，道路径流的入口比城市地区雨水的入口更具毒性）。未受污染的参比样品经100倍浓缩后未检出毒性。从溪流中收集的沉积物中未稀释的孔隙水样品对藻类都是有毒的，并且需要4-14倍的稀释以将生长速率抑制降低至20%。为了降低来自未污染流的孔隙水样品的毒性，仅需要1.6的稀释因子。观察到孔隙水的毒性和污染程度之间的定性相关性，如金属浓度所证明的，但不能建立统计上显着的相关性，例如金属含量或PAH浓度与观察到的毒性的排名程序。
The urban stream Store Vejlea (Denmark), which receives discharges of urban runoff, was investigated using a combination of biological toxicity tests (biotests) and chemical analysis. The urban stormwater and road runoff did not affect the mobilization of Daphnia magna, whereas three of the samples gave low, but statistically significant, effects on the reproduction of the alga Pseudokirchneriella subcapitata . In all pre-concentrated water samples toxic effects were found with EC10-values ranging from pre-concentration factors of 1.7 -43 times and differences in toxicity depending on time and location of sampling were identified (e.g. inlet of road runoff was more toxic than inlet of storm water from an urban area). No toxicity was detected in an unpolluted reference sample pre-concentrated 100 times. Undiluted pore water samples from sediments collected in the stream were all toxic towards the algae and dilutions from 4-14 times were needed to reduce the growth rate inhibition to 20%. To reduce the toxicity of a pore water sample from an unpolluted stream a dilution factor of only 1.6 was required. A qualitative correlation between the toxicity of the pore water and the degree of pollution as evidenced by the metal concentration was observed, but statistically significant correlations could not be established by ranking procedures of e.g. metal content or PAH-concentrations versus the observed toxicity.