Abstract
It was found out that a tertiary alcohol such as t-butanol, 3-pentanol, and 3-methyl-3-pentanol gave a red color by treatment with a vanillin and high concentration of sulfuric acid in a boiling water bath. Analytical procedure is as follows; To 2.0 ml of the test solution containing (550) μg of tertiary alcohol, add 1.0 ml of 0.7 w/v % vanillin solution (which is dissolved 0.7 g completely in 20 ml of ethanol, and diluted to 100 ml with water), and 5 ml of 80 % sulfuric acid. Heat the mixture in a boiling water bath for 20 min. After cooling to room temperature, measure the absorbance against the reagent blank. Absorption maxima for t-butyl alcohol, 3-pentanol, and 3-methyl-3-pentanol are 505 nm, 515 nm, 520 nm, with the molar extinction coefficient of 9.94, 13.4, 13.8×103 mol-1 cm-1 dm3, respectively.
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