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Quantitative analysis in alkaline solutions by Raman spectroscopy.

W W Rudolph¹, G T Hefter²

¹Medizinische Fakultät der TU Dresden, Institut für Virologie im MTZ, Fiedlerstr. 42, D-01307, Dresden, Germany.

Analytical Methods : Advancing Methods and Applications

|September 17, 2020

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Fourier Transform (FT) Raman spectroscopy effectively analyzes concentrated alkaline aluminate solutions, determining key anions like Al(OH)4-, SO42-, and CO32- at industrial levels. This method shows promise for broader applications in the alumina refining industry.

Area of Science:

Analytical Chemistry
Materials Science

Background:

Bayer liquors are complex concentrated alkaline aluminate solutions critical to alumina refining.
Accurate analysis of these solutions is essential for process optimization and quality control.

Purpose of the Study:

To investigate the efficacy of Fourier Transform (FT) Raman spectroscopy for analyzing concentrated alkaline aluminate solutions.
To determine key anionic species relevant to the alumina refining industry.

Main Methods:

Utilized FT Raman spectroscopy to analyze synthetic Bayer liquors.
Focused on the quantitative determination of aluminate (Al(OH)4-), sulfate (SO42-), and carbonate (CO32-) ions.

Main Results:

Achieved satisfactory quantitative determinations of Al(OH)4-, SO42-, and CO32- at industrially relevant concentrations.

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Demonstrated potential for analyzing other inorganic and organic anions.

Identified and addressed minor spectral interferences, particularly from SO42- impacting Al(OH)4- determination.

Conclusions:

FT Raman spectroscopy is a viable analytical technique for concentrated alkaline aluminate solutions.
The method shows promise for application in industrial Bayer process solutions.
Further development may enable hydroxide (OH-) determination with improved instrumentation.