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Comparison of techniques for chromium sesquioxide analysis in marker studies
Author(s) -
Lee Julian,
Fisher Murray T.,
Maré Beatrice
Publication year - 1986
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740370406
Subject(s) - chemistry , chromium , atomic absorption spectroscopy , ferrous , inductively coupled plasma , sesquioxide , titration , acetylene , chromatography , analytical chemistry (journal) , inorganic chemistry , plasma , organic chemistry , quantum mechanics , physics
Abstract Titrimetric, atomic absorption and plasma emission spectrometry methods are compared in the estimation of chromium from an alkaline fusion solubilisation of chromium sesquioxide (Cr 2 O 3 ) digestibility marker in rat faeces. Considerable differences in the between‐batch precision for the methods were noted. The ferrous ammonium sulphate titration showed the least imprecision (0.67% RSD) compared with 2.1% RSD for the inductively coupled plasma emission spectrometry and 4.7% RSD and 5% RSD for the atomic absorption methods of the nitrous oxide‐acetylene and air‐acetylene flames respectively. The atomic absorption methods were found to be highly sensitive to interferents, chromium oxidation state and changes in flame chemistry with respect to operating conditions.