University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Haemitite

Classification: Geological -> rock -> haemitite

Citations 1

"Use Of Acetohydroxamic Acid In The Direct Spectrophotometric Determination Of Iron(III) And Iron(II) By Flow Injection Analysis"
Anal. Chim. Acta 1987 Volume 196, Issue 1 Pages 333-336
A. T. Senior and J. D. glennon

Abstract: The sample (20 µL) containing Fe(III) and Fe(II) was injected into parallel streams (manifold illustrated) of 20 mM acetohydroxamic acid(I) and 2 mM 1,10-phenanthroline(II) in acetate buffer (pH 3.7) which were merged in turn with the water carrier stream (2 mL min-1). The absorbances of the Fe(III) - I and Fe(II) - II complexes were measured at 440 and 512 nm, respectively. The calibration graphs were rectilinear for 1.0 to 10 and 10 to 60 mg L-1 of Fe(III) and Fe(II), respectively, with a detection limit for Fe(III) of 0.2 mg l-1. The coefficient of variation (n = 6) was 2% and the results obtained for acid extracts of haematite samples agreed well with those from AAS. Interference studies showed that the method is highly selective.
Iron(2+) Iron(III) Spectrophotometry Multidetection Interferences Speciation Tecator