Characteristics of rivers in the Toyo River basin [Aichi, Japan] shown by nitrogen and phosphorus, 2
1984
Sano, M. (Aichi-ken. Environmental Research Center, Nagoya (Japan)) | Tsuruta, T. | Yamanouchi, T. | Ito, M. | Sakabe, T. | Ito, M.
The water quality of rivers in the basin of the river Toyo were studied to clarify the characteristics of each river. The relation between Cl- concentration and conductivity suggests that Cl- increases its weight among ions in the river water, as the concentrations of ions increase. Chroline ion will be caused by not only domestic waste but also agricultural and cattle wastes. The discrepancy of T-N/T-P ratio between clean and polluted rivers will come from that of source substance and the reaction rates of wastes with the soil in the basin of the river. Ch1. a to T-P ratio, which means utilization rate of phosphorous by periphyton, showed dependence on water temperature. Other factors such as flow rate and amount of organic matter flowing into the river will also influence the ratio. Although, methylene blue active substance (MBAS) became not to reflect domestic waste quantitatively, the ratios of MBAS to T-P and Cl- still show relative abundance of domestic waste in the river water. In conclusion, these relations mentioned above will show the contribution of each waste flowing into the river. So, results obtained here will show the method for water quality management in each river basin. These results also suggests the amount of N and P which can be allowed to load in the basin.
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