光電比色法によるアルコールのカメレオン価の表示法

抄録

In Japan the qualities of industrial alcohol have usually been indicated by chameleonnumber, i.e. the time required to decolorize the alcohol by a half volume of N/1000 chameleon solution until the color tone of the standard color solution (100 cc water solution of 0.2 cc of 0.1% methyl orange plus 4 cc of N/100 HCl) is reached. In this case the oxidation of the aldehyde occures first and then that of alcohol itself, and therefore,
when the quantity of the aldehyde is very minute, the index is not dependable. Moreover, the color is apt to differ according to the individual who conducted the test.
The author measured by spectrophotometer both the transmittance of the standard chameleon solution and I minute transmittance of the mixture of the alcohol and the chameleon solution, and used the latter's ratio to the former instead of the chameleonnumber hitherto used.