日本薬局方酸化マグネシウムおよび乾燥水酸化アルミニウムゲルの脱水

抄録

Moisture absorption and heat stability were examined with magnesium oxide, heavy magnesium oxide, desiccated aluminum hydroxide gel, and synthetic aluminum hydroxide, all in the Japanese Pharmacopoeia, by storage over a long period of time in 5-90% relative humidity. It was thereby found that these samples are comparatively stable below 60% of relative humidity and that majority of the samples showed a two-step decrease in weight by heating. This two-step decrease was found to be the liberation of adsorbed water molecule alone in the first step and that of water molecule realted to the structure in the second step. This fact agreed with the result of X ray diffraction data. Based on the above data, chemical kinetic analyses were made according to the method of Freeman and Carroll, and activation energy and reaction order were calculated.