Characteristics of lagoon water and precipitation in Niigata Prefecture from oxygen, hydrogen stable isotopes and tritium concentration

Abstract

In order to reveal the quality and isotopic characteristics of environmental waters in Niigata Prefecture, oxygen, hydrogen stable isotope ratios (δ¹⁸O, δD) and tritium (T) concentrations as well as the concentrations of several major ions in water samples were measured. Consequently, the following matters have been mainly clarified. (1) δ¹⁸O values of sample waters in Sakata are generally large. (2) In precipitation of Niigata Prefecture, d-excess was low in summer and high in winter. (3) Each concentration of T is about 0.33 Bq/kg for precipitation, 0.29 Bq/kg for lagoon water, and 0.24 Bq/kg for groundwater on average.