Calcium may react stoichiometrically with phosphonate compounds within certain ranges of concentration, pH, and temperature, despite the fact they are normally used as "threshold inhibitors". While this precipitation can be used to one's advantage in certain applications, it poses a problem in others. The work discussed in this report reviews laboratory and field investigations into calcium phosphonate precipitation, variables affecting precipitation, and the screening of various phosphonate inhibitors for calcium tolerance under extreme conditions.

Subject
Acids, Chemical compounds, Water, Precipitation (solids), Titration, Phosphonates, Scale inhibitors, Calcium, Acidity, Phosphates, Wellheads, Corrosion inhibitors, Scaling
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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