The 3-Methyl-2-benzothiazolone Hydrazone Test: Sensitive New Methods for the Detection, Rapid Estimation, and Determination of Aliphatic Aldehydes

Abstract

▶ Sensitive new analytical methods for water-soluble aliphatic aldehydes has been introduced. Versatile spot plate, paper, silica gel, and colorimetric modifications of the procedure are of value in the detection, estimation, and determination of these aldehydes. In the test procedure an intensely brilliant blue cationic dye is formed. Particularly advantageous is the simple sensitive silica gel procedure for the detection or estimation of aldehydes. The color of the dye obtained in the colorimetric procedure for formaldehyde is much more intense than any of the colors obtained for formaldehyde with well known procedures. In the determination of formaldehyde, Beer's law was obeyed from 5 to at least 125 μg. per 100 ml. of solution. The silica gel and colorimetric methods can be applied to the analysis of auto exhaust fumes and polluted air. Two simple methods for the synthesis of the reagent, 3-methyl-2-benzothiazolone hydrazone, are described. © 1961, American Chemical Society. All rights reserved.