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A peer-reviewed journal highlighting the advancement of analytical technologies for wider application by the international scientific community.
Paper
Anal. Methods, 2009, 1, 132 - 138, DOI: 10.1039/b9ay00064j
Quantitative analysis in alkaline aluminate solutions by Raman spectroscopy
W. W. Rudolph and G. T. Hefter
A detailed investigation has been made of the analysis of concentrated alkaline aluminate solutions (synthetic Bayer liquors) by Fourier transform (FT) Raman spectroscopy. Satisfactory determinations of Al(OH)4-, SO42- and CO32- were achieved at industrially-relevant concentrations. Possible extensions to a number of other inorganic and organic anions of interest to the alumina refining industry were demonstrated. No significant interferences were observed except for a small but readily correctable contribution of a minor SO42- mode at
615 cm-1 to the Al(OH)4- envelope centred at 620 cm-1. Hydroxide (OH-) could not be determined with the present FT instrument, due to the low detector sensitivity at high wavenumbers, but might be possible with other spectrometers. Successful extension of the analyses to industrial Bayer process solutions is briefly discussed.
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