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Determination of phosphorus by sample combustion followed by non-suppressed ion chromatography

Citation

Umali, JC and Moran, GM and Haddad, PR, Determination of phosphorus by sample combustion followed by non-suppressed ion chromatography, Journal of Chromatography A, 706, (1-2) pp. 199-207. ISSN 0021-9673 (1995) [Refereed Article]


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DOI: doi:10.1016/0021-9673(94)01160-G

Abstract

The determination of phosphorus using sample combustion in oxygen followed by quantification of orthophosphate using non-suppressed ion chromatography (IC) was studied using phenylphosphonic acid as a model sample compound. Even under optimal conditions, the recovery of phosphorus (measured as orthophosphate) was < 70% when dilute aqueous hydrogen peroxide was used as the absorbing solution employed to collect the combustion products. However, use of inductively coupled plasma atomic emission spectroscopy and spectrophotometry using heteropoly blue formation showed that all of the phosphorus in the original sample was in fact also present in the absorbing solution, but suggested that some of this phosphorus was present as forms other than orthophosphate. 31P Nuclear magnetic resonance was used to study the composition of the combustion solution and confirmed the presence of orthophosphate, pyrophosphate and trimetaphosphate. Hydrolysis of the combustion sample solution by boiling for at least 20 min at pH < 3 was shown to convert all of these forms of phosphorus to orthophosphate, thereby enabling their determination by IC. Quantitative recoveries of phosphorus were achieved when this post-combustion hydrolysis step was incorporated into the analytical procedure.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Analytical Chemistry not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Haddad, PR (Professor Paul Haddad)
ID Code:6103
Year Published:1995
Web of Science® Times Cited:4
Deposited By:Chemistry
Deposited On:1995-08-01
Last Modified:2010-02-19
Downloads:0

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