| Budget Amount *help |
¥1,380,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥180,000)
Fiscal Year 2007: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
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| Research Abstract |
In Japan, most hydrochemical research has been emphasizing on geothermal waters or anthropogenically polluted river water, if not, deep underground water from the aspect of the disposal of high level radioactive waste. From the viewpoint of chemical components, the hydrochemical research work has emphasized only health-related parameters such as chemical oxygen demand (COD),biochemical oxygen demand (BOD),heavy metals or other trace elements. Hydrochemical research is relatively rare for non-geothermal surface water ; especially little attention has been paid to the major chemical components, which control the fundamental water chemistry. Therefore, the present authors investigated the river water in wide region that covers most of the Tohoku and Hokuriku area. In 2006 and 2007, ca. 240 samples were collected altogether, from 100 rivers in Tohoku and Hokuriku area. The chemical concentrations of most components have increased by 10-30 % within those 50 years. Among those elements, NO^3, which is the most sensitive component to anthropogenic effect, has increased by 180 % in the same period
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