SAMPLING AND ANALYSIS OF SOME CORROSION INHIBITING AMINES IN STEAM CONDENSATES

The analysis of corrosion inhibitors, such as morpholine (MOR), cyclohexylamine (CHA), diethylaminoethanol (DEAE) and octadecylamine (ODA) in steam condensates sampled in four hospitals and one food processing plant, is described. An aqueous injection-gas chromatographic procedure was developed for the analysis of DEAE; mixtures of CHA and MOR were determined by a similar method. ODA was quantitated by a colorimetric method. Levels of amines were consistently low (4.2 mg/L) in steam sampled in systems in which the addition of amines to the boiler feed water was continuously metered. In a closed-loop, low pressure system in which the amine formulation was added in a single dose to the boiler in an irregular manner, concentrations of amines in steam condensates were high (10,200 to 13,900 mg/L). Copyright © 1979 by Marcel Dekker, Inc.