Some Ion Concentrations in River Water of the Yoshinogava and their Estimation from Electric Conductivity

Abstract

The river water of the Yoshinogawa was investigated by ion chromatography and discussed on characteristics of water. Water temperature, pH, electric conductivity, anion concentrations (chloride, phosphate, nitrite, nitrate, sulfate ions), and cation concentrations (sodium, ammonium, potassium, calcium and magnesium ions) were measured. The ion concentrations increased almost linearly toward the lower reaches of the river. And the electric conductivities were nearly proportional to the ion concentrations in this river. The equations between electric conductivity and dissolved ion concentrations (chloride, nitrate, sulfate, sodium, potassium, calcium and magnesium ions) in the river water were proposed. High correlations were obtained. In all ions, coefficient of correlations were O.955 or above. Accordingly, ion concentrations of the river water were estimated from electric conductivity by proposed equations and compared with the analytical values obtained by ion chromatography. The equations were also applied to the data of the Yoshinogawa water after 2 years. These values were in fair agreement with the analytical ones except nitrate ion.