Study of equilibria in 0.03 mM molybdate acidic aqueous solutions by factor analysis applied to ultraviolet spectra

Abstract

Support of this work by the National Science Foundation (Chemical Analysis Program, Grant CHE-8215508) and the North Carolina Board of Science and Technology (Grant 3125) is gratefully acknowledged. Thanks are also due to the Alcoa Foundation for providing an Alcoa Undergraduate Summer Research Fellowship to J.M.W. and to the R. J. Reynolds Foundation for providing a Wake Forest University Reynolds Research Leave Grant to W.L.H. A.I. was a 1983 participant in the Swedish CHUST Program.

Calculating the partitioning of the isotopes of Mo between oxidic and sulfidic species in aqueous solution

“…The energetics of this reaction are described in more detail in a previous study (Tossell, 2005). Several previous researchers have suggested that the stable form of MoO 2 (OH) 2 , neutral molybdic acid, is actually Mo(OH) 6 or MoO 3 (OH 2 ) 3 , based on thermodynamic criteria (Cruywagen andHeyns, 1989, 2000) or analysis of the UV-vis spectra (Ozeki et al, 1988) and quantum calculation of this spectrum, using assumed geometries (Ozeki et al, 1996). However, we see for reaction 2 that the formation of the six-coordinate (roughly) octahedral Mo(OH) 6 molecule from MoO 2 (OH) 2 and two waters is calculated to be highly endoergic, indicating that the Mo(OH) 6 species is highly unstable.…”

Accumulation Voltammetry of MoO42– at a Glassy Carbon Electrode Covered with Chitin Film

“…MoO4 2-remained on the basis of the electrostatic interaction between MoO4 2-(Mo7O24 6-) and protonated acetylamide group of chitin film. 11 When the pH value of acetate buffer for accumulation of molybdenum was investigated (pH 3.3 -6.0), the peak current of molybdenum was maximum at pH 4.3. The reasons are as follows.…”

Mixture analysis using factor analysis. II: Self‐modeling curve resolution

“…characterized the ultraviolet spectra of a similar aqueous molybdic acid solution. 62 Nelson et al devised an SMCR scheme using the SVD to resolve the spectra of pure components in mixtures. 63 They demonstrated the technique with the excitation-emission matrix of acridine, fluoranthene and pyrene.…”