Masking of iron with fluoride in the extractive atomic-absorption spectrometric determination of chromium in steel.
Chromium in steel is determined by oxidation to dichromate, extraction into methyl isobutyl ketone from 1-3 M hydrochloric acid, and atomic-absorption measurements on the extract. The interference of iron in the atomic absorption is eliminated by using fluoride to keep the iron(III) in the aqueous phase in the extraction step.
Fogg
A G
AG
Chemistry Department, University of Technology, Loughborough, Leics., U.K.
Soleymanloo
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S
Burns
D T
DT