Determination of Sequestration Capacities of Iron Control Chemicals

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 m...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 1995-01, Vol.121 (1), p.108-112
Main Authors: Harwood, John J, Temkar, Prakash M, Scholtze, Richard J
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Electrochemical methods
Exact sciences and technology
Phosphates
Q1
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Summary: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.
ISSN:0733-9372
1943-7870
DOI:10.1061/(ASCE)0733-9372(1995)121:1(108)