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首页> 外文期刊>International Journal of Soil, Sediment and Water >ASSESSMENT OF STREAM FISH MORTALITY FROM SHORT-TERM EXPOSURE TO ILLITE CLAYS USED AS AN IN SITU METHOD FOR REMEDIATING 137CS CONTAMINATED WETLANDS
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ASSESSMENT OF STREAM FISH MORTALITY FROM SHORT-TERM EXPOSURE TO ILLITE CLAYS USED AS AN IN SITU METHOD FOR REMEDIATING 137CS CONTAMINATED WETLANDS

机译：从短期暴露到伊利石粘土的流域鱼类死亡率评估，原位修复137CS受污染的湿地

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摘要

Due to their physical properties, illite clays can sorb cesium-137 almost irreversibly, and therefore sequester contamination from the environment. However, applying large amounts of clay to natural aquatic habitats for in situ remediation purposes may create conditions of high turbidity and sedimentation. To evaluate potential effects of turbidity from illite application on survivorship of stream fish, yellowfin shiners (Notropis lutipinnis) and tessellated darters (Etheostoma olmstedi) were subjected to treatment with two different types of clay in flow-through simulated stream raceways. Turbidity and fish mortality were subsequently monitored for seven days. At 2-m downstream from the application point, mean turbidity peaked during clay application at 525 and 72 nephelometric turbidity units (NTU) in the air-floated illite and semi-dry illite treatments, respectively. Turbidity returned to levels similar to that of the controls (4-6 NTU) after four hours in the air-floated illite raceways and one hour in the semi-dry illite raceways. Although the majority of the suspended clay was quickly flushed from the system and the remaining settled to the bottom, turbidity did continue to fluctuate because of fish movements and sediment resuspension. Fish mortality did not significantly differ among control and illite treated raceways.
机译：由于其物理性质，伊利石粘土几乎可以不可逆地吸收铯137，因此隔离了环境中的污染物。但是，将大量粘土用于天然水生生境以进行原位修复可能会产生高浊度和沉积条件。为了评估伊利石的混浊对河鱼生存的潜在影响，在流过的模拟河道中对黄鳍光泽（Notropis lutipinnis）和镶嵌飞镖（Etheostoma olmstedi）进行了两种不同类型的粘土处理。随后对浊度和鱼类死亡率进行了7天的监测。在施工点下游的2 m处，在气浮伊利石和半干伊利石处理中，在黏土施工期间平均浊度分别达到525和72浊度浊度单位（NTU）。在空气漂浮的伊利石管道中运行了四个小时，在半干的伊利石管道中运行了一个小时之后，浊度恢复到了与对照（4-6 NTU）相似的水平。尽管大部分悬浮粘土从系统中迅速冲洗掉，其余的沉降到底部，但是由于鱼的运动和沉积物的重新悬浮，浊度的确在继续波动。对照和经伊利石处理的水道之间的鱼类死亡率没有显着差异。

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