Determination of Sequestration Capacities of Iron Control Chemicals
Publication: Journal of Environmental Engineering
Volume 121, Issue 1
Abstract
Titrimetry with electronanalytical endpoint detection was used to determine sequestration capacities of polyphosphates for Fe 2+ and Fe 3+. These methods have the advantage of directly monitoring sequestration of the metal ions. Potentiometry with a divalent ion ion-selective electrode was used to monitor sequestration of Fe 2+; polarography was used to monitor sequestration of Fe 3+. Four commercial liquid polyphosphate formulations, a Zn-orthophosphate, a silicate formulation, two solid polyphosphates, and pyrophosphate were studied. No significant difference was found in sequestration capacities for either metal ion among the polyphosphates. Polyphosphates were found to sequester only about 14% as much Fe 2+ as Fe 3+. The polarographic titration affords an efficient, precise method of studying factors affecting sequestration of iron by polyphosphates.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 121 • Issue 1 • January 1995
Pages: 108 - 112
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Jan 1, 1995
Published in print: Jan 1995
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