柳山火山喷发后长江河的砷污染

Chikahide Komura, T. Hama, Yukihiro Ichinose, T. Kubota
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引用次数: 2

摘要

地处火山地区、受火山活动影响的河流流域的水质会受到酸性水的影响,造成地表水的污染。2018年4月19日,雾岛火山之一的Iou火山250年来首次喷发,导致泥浆和酸性水排放到长江中,砷的浓度超过了环境标准(10 μ g L -1)。本研究通过连续观测研究了径流过程中砷浓度的变化、pH值与电导率(EC)的关系以及径流特征。结果表明:在径流过程中,由于支流水的冲淡,河水被稀释并得到改善;砷浓度与pH和EC存在相关性,特别是在上游地区和非阴雨天;砷浓度与铁、铝、锰浓度存在相关性。因此,在非雨天,砷在河床底部积聚,在雨天,由于河流沉积物的再悬浮,砷的浓度变得很高。
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Arsenic Pollution in Nagae River after Volcanic Eruption of Mt. Iou
The water quality of the river basins situated in volcanic areas and exposed to volcanic activity can be affected by the acidic water, resulting in the pollution of surface water. On April 19th, 2018, the first eruption in 250 years of Mt. Iou, one of the Kirishima volcanos, caused the discharge of mud and acidic water into the Nagae River, contaminating the water with arsenic at a high concentration that exceeded the environmental standard ( 10 µg L -1 ) . In this study, we investigated the changes in arsenic concentration in the streamflow process, the relationship between pH and Electrical Conductivity ( EC ) , and the runoff characteristics through a continuous observation. The results indicate that the river water was diluted and improved during the streamflow process owing to dilution as a result of influx of water from tributaries, the arsenic concentration has a correlation with pH and EC, particularly, in the upstream area and on nonrainy days, and the arsenic concentration correlates with iron, aluminum, and manganese concentrations. Consequently, arsenic accumulates at the bottom of the riverbed on nonrainy days, and its concentration becomes high owing to the resuspension of the river sediment on rainy days.
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