Investigation of Mo(VI) monomer-dimer equilibrium in highly acidic solutions by UV absorbance spectroscopy using refined numerical processing

Authors
Esbelin, E Gareil, P Masson, M Emin, JL
Citation
E. Esbelin et al., Investigation of Mo(VI) monomer-dimer equilibrium in highly acidic solutions by UV absorbance spectroscopy using refined numerical processing, ANALYT CHIM, 433(2), 2001, pp. 299-310
Citations number
9
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
ANALYTICA CHIMICA ACTA
ISSN journal
00032670 → ACNP
Volume
433
Issue
2
Year of publication
2001
Pages
299 - 310
Database
ISI
SICI code
0003-2670(20010411)433:2<299:IOMMEI>2.0.ZU;2-G
Abstract
The chemical forms of molybdenum(VI) in highly acidic media (0.5-3 M HClO4) were investigated by UV absorbance spectrometry at 25 degreesC, confirming the existence of dimeric forms. Comparing the results obtained for various HClO3/NaClO4 mixtures showed that water activity has a greater effect on t he dimerization equilibrium than the acidity. A conditional dimerization co nstant K'(d) can be defined as a function of the perchloric acid concentrat ion. New numerical methods were used to estimate the value of K'(d), which was found to vary according to an empirical law.