Abstract
The geochemical behavior of arsenic-bearing groundwaters from four areas-Fukuoka, Kumamoto, Fukui, and Takatsuki-has been reviewed and considered from the viewpoints of the chemical composition of the water, the geological setting of the host formation, and the arsenic content in sediments and rocks. In all the areas except Fukui, arsenic-bearing water is concluded to have come from a specific aquifer during water-sediment interactions. Stagnant groundwater, having reducing and alkaline properties, played a significant role in the release of arsenic from such Quaternary sediments as silt-clay layers and brownish-colored gravel beds.
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