HPLC (high performance liquid chromatography) measurement of water soluble quaternary pyridinium salts offers an improvement over previous methods for monitoring corrosion inhibitor residuals. The new method uses the ultra-violet absorbance of the major component of the inhibitor. Response is linear with concentrations between 1 and 1000 ppm, which is the useful working range of the method. Detection limits of less than 1 ppm have been verified. The HPLC technique is free from most of the inaccuracies and interference problems which plagued previous monitoring methods. The problems with methods used previously in the field are discussed, and an experiment was performed to show how HPLC has been able to overcome the most common interference problem with the commonly used dye transfer method, namely that of competitive ion-pairing with surfactants.

Subject
Quaternary amines, Water, Inhibitor performance, Absorbance, Calibration, Industries, Solvents, Corrosion detection, Liquids, Personnel, Corrosion inhibitors, Chromatography, Samples
Keywords:
HPLC, high performance liquid chromatography, quaternary amine, corrosion inhibitor, residual analysis, ultra-violet
© 1993 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1993
Association for Materials Protection and Performance (AMPP)
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