2005 Volume 47 Issue 1 Pages 97-115
In order to study the origin of phosphorus in the river waters, the concentration and the source of the phosphorus and vanadium in the underground waters, springs as well as river waters at the foot of Mt Fuji, Mt. Yatsugatake and Kofu basin were investigated. The phosphorus and vanadium concentrations in the underground and spring waters in these areas were classified into three groups, and show a positive relationship between phosphorus and vanadium concentration in them. Furthermore, both of these elements concentrations in the samples are the highest at the foot of Mt. Fuji area, become gradually lower at the foot of Mt. Yatsugatake area, and Kofu basin area.
The ratio of phosphorus to vanadium concentration (phosphorus/vanadium ratio) of underground and spring waters were also classified into three groups. The ratio of the samples in Mt. Fuji area is smaller than that in Mt. Yatsugatake and Kofu Basin area. The phosphorus/vanadium ratio obtained from these water samples is also similar to those estimated for rocks distributed in each of these areas; Mt. Fuji, Mt. Yatsugatake and Kofu Basin. Based on these regional differences of phosphorus and vanadium concentrations and phosphorus/vanadium ratio, it is suggested the phosphorus and vanadium concentrations in the underground and spring waters are characterized by the geochemical effects of the rocks and strata such as basaltic, andesitic and granitic rocks that are dominant in the area.
The characteristic s of phosphorus and vanadium concentrations and their ratios obtained in the Sagami River is essentially similar to those of the underground and spring waters come from around and upper part of the river. Therefore, the origin of phosphorus and vanadium concentrations of the Sagami River were essentially explained by geochemical effects from the rocks and strata distributed the area along the river. However, phosphorus concentration of the Sagami River is slightly higher than that of the underground waters and/or springs upper part of the river.
The vanadium concentration obtained in the Fuji River is also similar to the concentration of underground and spring waters around and upper parts of the riven On the other hand, the phosphorus concentration and phosphorus/vanadium ratio in the Fuji River is extremely higher than that of the underground and spring waters come from around and upper part of the river.
It seems that the phosphorus concentrations of the Sagami and Fuji Rivers is explained by the migration of phosphorus concentrations from underground and/or spring waters come from around and upper part of the river and by the excess phosphorus concentrations. The total phosphorus concentration of the river waters comes from the combination of underground, spring water concentrations and excess phosphorus concentration by artificial effects. The artificial excess phosphorus concentration was calculated by subtracting the underground and spring water concentration from the total concentration in the river waters. Accordingly, it is possible to estimate the excess phosphorus concentration of river water by the help of both the phosphorus and vanadium information of underground and spring waters in the area.
