豊平川における水質および底質中重金属の挙動と解析

概要

論文の詳細を見る
Manganese, zinc, copper, chromium, lead and cadmium concentrations in water and sediments were determined for the samples from an area along the basin of the Toyohira River which runs through Sapporo City in Hokkaido, Japan. In the present study, the relationship of heavy metal concentrations against a background level was analyzed, to see whether the heavy metal concentrations in the environmental samples could be used as an available indicator of water pollution originating from outside. This study distinguishes the pollution characteristics from each drainage source. Since there was a close relationship between heavy metal changes in water and those in sediments, the marked distribution trend of content of Mn, Zn and Cd was almost the same for both. The heavy metal concentrations generally increased with the decreasing particle size of the sediments. Seasonal changes in the concentrations of particle of smaller size, moreover, were greater than changes among the larger particles. A method of grading or ranking particle sizes was devised for a grasp of a behaviour of heavy metals in sediments, and by using this method of sieving sediments the authors discussed a simple and effective method for an environmental assessment of river pollution.
北海道大学の論文
1987-08-17