Research for carbon dioxide bathing. III. Basic points for the artificial CO2-bathing and on the effect of CO2 concentration released in the air / 日本温泉気候物理医学会雑誌

ABSTRACT

It has been well recognized that no known method can produce as strong or as effective a bath as can be given with natural waters.<br>The method of bubbling gas through the bath water is thought to be almost entirely ineffective; the solubility of CO₂-gas in water at 40°C is about 10%, but is much further enhanced about 50% by bubbling through an airstone, making fine bubbles.<br>Tablet form of the CO₂-bath preparation, made from bicarbonate and succinic acid, produces fine CO₂ bubbles so that about 80% of water solubility at 40°C can be obtained.<br>A CO₂-bath preparation, 50g tablet, can produce 100ppm in maximum concentration in a bath of 150 liter at 40°C, maintaining the level of more than 60ppm for 2 hours.<br>In order for the safety to estimate the escaped CO₂, a large quantity of the CO₂-bath preparation, 20 and 50 tablets, was used in a relatively air tight room; CO₂ concentration reached the maximum level of 1.9 and 6.6% respectively with a tendency of rapid falling, so that the critical complications could rarely be happened.