Self-diffusion coefficients of water in pure water and in aqueous solutions of several electrolytes with 18O and 2H as tracers

Abstract

The self-diffusion coefficients of water in pure water and in aqueous electrolyte solutions have been measured by using the sintered glass diaphragm cell technique with ²H and ¹⁸O as tracers. The extrapolated value from ²H tracer data, 2.27 × 10^–9 m² s^–1, agrees with the value from ¹⁸O tracer data which is less sensitive to tracer concentration. In most electrolyte solutions investigated, no significant isotope effect in water diffusion was observed.