Abstract
Abstract Changes in the chemical compositions of Tamagawa Hot Spring waters and Pb-bearing barite (hokutolite) were examined. Samples were obtained from various locations and various time in Tamagawa Hot Spring. The relationships between the hot spring waters and the minerals were expressed as partition equations and phenomenological equations; then, the partition coefficients and phenomenological coefficients were calculated. The apparent partition coefficients of Pb2+ and of Sr2+ between the two phases were found to have increased, from 0.14 to 0.30(0.31) and from 0.023 to 0.035(0.042) respectively, with the decrease in the hokutolite growth rate since 1973. The reaction rate of hokutolite as calculated from the phenomenological equations was, however, about 2 times higher in 1983 than in 1965. These results were ascribed to the rise in the degree of the supersaturation of barium sulfate and also to the increase in the nucleation rate in the hot spring water.
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