Preliminary work devoted to elucidate the action of glutaraldehyde (GA) on Pseudomonas fluorescens and Desulfovibrio desulfuricans biofilms formed on AISI 304L SS and SAE 1020 mild steel is presented. Results show that efficacy of GA on planktonic cells is markedly higher than that on sessile cells. GA efficacy on biofilms formed on AISI 304L SS coupons (which are copious and cover large areas) is lower than that observed for SAE 1020 mild steel (which present a patchy distribution and scarce mucilaginous masses). It is concluded that biocidal activity of GA depends markedly on the nature of the substratum. Effect of GA on the metal corrosion is also analysed. High concentrations of GA in sulfide containing media displaces pitting potential of SAE 1020 steel in the noble direction.

Subject
Scanning electron microscopy, Electrochemical cells, Steel coupons, Sodium chloride, Desulfovibrio desulfuricans, Biofilms, Efficacy, Sodium chloride solution, Metals, Bacteria, Steel, Immersion, Biocides
Keywords:
Biocide, glutaraldehyde, sessile bacteria, biofilms, MIC, sulphate-reducing bacteria, Pseudomonas fluorescens
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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