An Estimation for the Effect of Natural Purification on coal field water"Akamizu (sprung from Chikuho Area)"

作者在1993年4月至1995年3月的两年时间里，用水文地质和地球化学方法对赤水进行了调查。本文对新旧赤水的化学成分进行了比较，并对赤水的自然净化进行了估算。旧数据是在赤尾煤田煤矿全部关闭2-3年后的20年前获得的，结果是，在旧数据中，几乎所有赤水泉水的电导率都在1000mus/cm以上，在新数据中，有一半的泉水电导率低于1000mus/cm。四分之一的泉水在化学性质上似乎是地表水。

Writer has been engaged in surveying "Akamizu" by hydrogeological and geochemical method during two years from April 1993 to March 1995.In this paper, he compares old and new Akamizu in chemical component and estimates for natural purification on Akamizu. Old data were obtained twenty years ago 2 or 3 years after all coal mines were closed in Chikuho coal field.As a result, in old data, almost all Akamizu springs showed more than 1000 muS/cm in electrical conductivity, in new data, a half of springs showed less than 1000 muS/cm. And a quarter of springs appeared to be surface water in chemical properties.