NDLI: Speciation of iron in river water using a specific catalytic determination and size fractionation

Content Provider	Royal Society of Chemistry (RSC)
Author	Kawakubo, Susumu Iwatsuki, Masaaki Tachikawa, Kazuhiro
Copyright Year	2002
Abstract	A comprehensive speciation scheme was proposed for the speciation of iron in river water (0.45 µm filtrate). The speciation was based on the catalytic determination of reactive iron as Fe3+ and FeIIILi(3 − in)+, where i = 1 or 2 for a unidentate and i = 1 for a bidentate ligand, Ln−. The scheme incudes size fractionation and acid decomposition of the sample and determination of the coexisting species. The proposed scheme was applied to natural and artificial samples and acidified preparations of these. Resulting fractionation patterns of reactive and unreactive iron and of coexisting humic acid were useful for the characterization of iron species in the natural samples. The reactive iron in the molecular weight (Mr) ≥ 104 fraction was associated with humic iron aggregates and estimated as iron complexed with them. The unreactive iron in this fraction dissociated in 0.1 M HCl and was estimated as iron in the aggregates of iron(III) hydroxide (s) and humic iron. From the fractionation results of the artificial sample, the reactive and unreactive iron in the Mr < 103 fraction may be formed by complexing simple anions like F− and C2O42− at their naturally-occurring concentration levels. The fractionation results also suggested that humic acid and Si contributed to the formation of reactive and unreactive iron in the Mr ≥ 104 fraction.
Starting Page	263
Ending Page	269
Page Count	7
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	4
Issue Number	2
Journal	Journal of Environmental Monitoring
DOI	10.1039/b108887b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Speciation Micrometre Denticity Ligand Acid Humic acid Hydrochloric acid Iron(III) oxide-hydroxide
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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