The activity of NaCl in seawater of 10–40‰ salinity and 5–25°C at 1 atmosphere |
| |
| Authors: | Kenneth S Johnson Ricardo M Pytkowicz |
| |
| Institution: | School of Oceanography, Oregon State University, Corvallis, OR 97331 U.S.A. |
| |
| Abstract: | The activity of NaCl in artificial seawater was measured potentiometrically with Na+- and Cl? -sensitive electrodes. The salinity of the solutions, examined at 25°C, ranged from 10–40‰ salinity. The change in the activity from 5–25°C was measured at 35‰ salinity.The molal mean activity coefficient of NaCl in 35‰ seawater at 25°C is 0.667. The relative partial molal enthalpy of NaCl in 35‰ seawater is ?130 ±50 cal mol?1. This value is in good agreement with the value measured in pure 0.72 M NaCl.The results were compared with activity coefficients predicted by a specific interaction model and by an ion association model. Good agreement was found in both cases. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
