Use of hydrous iron(III) oxide in a concentration step for the determination of trace amounts of organophosphorus compounds in aqueous solutions

A procedure for releasing organophosphorus compounds (OPs) adsorbed onto an hydrous iron oxide (HIO) matrix into a small volume water phase was proposed from which a concentration method for the determination of trace amounts (sub umolar) of OPs in water was developed. The whole procedure, involving...

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Bibliographic Details
Published in:Analyst (London) 1992, Vol.117 (5), p.893-897
Main Authors: HORI, T, SUGIYAMA, M
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemical and thermal methods
Chemistry
Exact sciences and technology
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Summary:A procedure for releasing organophosphorus compounds (OPs) adsorbed onto an hydrous iron oxide (HIO) matrix into a small volume water phase was proposed from which a concentration method for the determination of trace amounts (sub umolar) of OPs in water was developed. The whole procedure, involving adsorption of Ops onto HIO from a 1 litre water sample, separation of the HIO by filtration and release of the OPs using pentane-2,4-dione (acetylacetone (Hacac)) into a 2.5 ml aqueous phase, realized a 400-fold concentration of OPs with efficiencies ranging from 45 per cent (adenosine-5-triphosphate) to 92 per cent (2-aminoethylphosphonate). The characteristics of the adsorption curves for 13 types of OPs were reported. Adsorption was primarily governed by the number of free PO moieties and was scarcely affected by the bulk of the substituent groups and the oxidation state of the P atoms.
ISSN:0003-2654
1364-5528
DOI:10.1039/an9921700893