Abstract
The purpose of this investigation is to find the total mercury concentration in the weathered volcanic ash bed (so-called Kanto loam) in a non-polluted area and to compare the values with those of aqueous sediments and surface black soils which are more or less polluted. The 26 samples were collected systematically according to the columnar section of Kanto loam at Minasawa, on the southern foot of Akagi volcano. These samples were powdered, dried at room temperature and analyzed by an atomic absorption spectrometry with a reduction-vapor phase technique. Data show a considerable range from 0.077 ppm to 0.005 ppm. The average of the primary mercury concentration in northern Kanto loam is estimated to be of 0.033ppm.
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