Abstract
Two analytical techniques are described which have been adapted to industrial hygiene purposes for determining microgram quantities of airborne vapors of diethanolamine, 2-methylaminoethanol, and 2-diethylaminoethanol. The first two of these materials are secondary amines, and are oxidized with potassium dichromate; the residual unreduced dichromate is then reacted with 1,5-dipheuylcarbohydrazide to form a pink color which is determined spectrophotometrically. The 2-diethylaminoethanol, a tertiary amine, is collected in water, extracted with ethylene dichloride, and then reacted with methyl orange to form a complex which breaks up in acid solution to again produce a color which may be read on a spectrophotometer.