The Geochemical Study of Rivers in Japan

(part 2) On the Nagase Rver, Fukusima Prefecture

Abstract

Water of the Nagase River in Fukushima Prefecture which flows into the Lake Inawashiro is well known by its strong acidity. Observations were done by the authors on the distribution of pH along the river. It was fonnd that the origine of acid is due to the hot spring Nakanosawa which is strongly acidic by its sulphuric and hydrochloric acid content. By this acidic water the Nagase River and also the Iake Inawashiro are polluted in which fishes can not live. The distribution of other chemical constituents were also studied.