Method for assessing the inertia of carbon dioxide gas exchange across the water-air interface
摘要
The article considers changes in water properties under the influence of various external factors and points out the absence of a generally accepted procedure for accounting for the effect of air on distilled water. The possibility of instrumental assessment of the effect of carbon dioxide (CO2) on the electrical conductivity of distilled water has been analyzed. For this purpose, the inertia of CO2 gas exchange at the water/air interface was experimentally studied using sealed conductometric cells, filled with distilled water to achieve filling factors of 10–100%, with the water heating (cooling) rates ranging from 0.04 to 2.00 °C/min. A method for performing a numerical assessment of the inertia of CO2 gas exchange at the water/air interface using a special coefficient of gas exchange inertia is proposed. This coefficient is calculated based on the ratio between the variation in specific electrical conductivity of water and its average value under the “heating—cooling” conditions. The electrical conductivity of water was measured within the temperature range of 20–55 °C. Based on the experimental results, the dependences of the gas exchange inertia coefficient on the water heating rate at different cell filling factors were obtained. It was shown that the highest level of gas exchange inertia is achieved at the maximum water heating (cooling) rate and minimum cell filling with water. The highest experimental value of the CO2 gas exchange inertia coefficient was about 8%. The obtained results can be used in practice for performing a quantitative assessment of the permeability of the water/air interface for CO2 molecules under exposure to various external factors.