A New Method for Low-Temperature Decomposition of Chromites and Dichromium Trioxide using Bromic Acid Evaluated by Chromium Isotope Measurements

0427709 - GLÚ 2015 RIV FR eng J - Journal Article
Chrastný, V. - Rohovec, Jan - Čadková, E. - Pašava, J. - Farkaš, J. - Novák, M.
A New Method for Low-Temperature Decomposition of Chromites and Dichromium Trioxide using Bromic Acid Evaluated by Chromium Isotope Measurements.
Geostandards and Geoanalytical Research. Roč. 38, č. 1 (2014), s. 103-110. ISSN 1639-4488. E-ISSN 1751-908X
Institutional support: RVO:67985831
Keywords : chromites * dichromium trioxide * decomposition * chromium isotopes * bromic acid
Subject RIV: DD - Geochemistry
Impact factor: 3.208, year: 2014

In recent years, routine application of the stable isotope determination of chromium (Cr) in environmental and health protection research has led to the search for simpler chromite decomposition techniques. As the range of Cr isotope abundance ratios in nature is very narrow, conventional chromite decomposition techniques are no longer suitable, due to the relatively high risk of contamination during laboratory procedures. We have developed a protocol for the decomposition of chromites based on oxidation by bromic acid at room temperature. The procedure takes 15 d and requires two doses of bromic acid during the reaction period (day 1 and 8), due to the limited stability of the reagent. Chromium extracted by alkaline oxidative fusion and by bromic acid decomposition yielded statistically indistinguishable δ53Cr values, measured by multi-collector inductively coupled plasma-mass spectrometry following addition of a 50Cr-54Cr double-spike.
Permanent Link: http://hdl.handle.net/11104/0233217