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Gewählte Publikation:

Korntner, P; Schedl, A; Sumerskii, I; Zweckmair, T; Mahler, AK; Rosenau, T; Potthast, A.
(2018): Sulfonic Acid Group Determination in Lignosulfonates by Headspace Gas Chromatography
ACS SUSTAIN CHEM ENG. 2018; 6(5): 6240-6246. FullText FullText_BOKU

A method for the determination of the sulfonic acid content in lignosulfonates via sulfur dioxide quantification upon treatment with H3PO4 by headspace gas chromatography is presented and compared to two already established alternatives, conductometric titration and elemental analysis. Several lignosulfonates, purified from various industrial sources, were examined by all three methods. Limitations and possible interference by other functional groups, such as carboxylic acids, are discussed, and suitable solutions are presented. Results of the novel approach are comparable to those of the established techniques in terms of accuracy and precision. The limit of detection (LOD) is 0.88 mu mol of SO3H and the corresponding limit of quantification (LOQ) is 3.78 mu mol of SO3H. At the same time, this method outperforms conductometric titration in terms of a higher sample throughput and a much smaller sample amount needed for analysis. Treatment of the sample with highly concentrated phosphoric acid and simple heating is straightforward enough to render the method a valuable tool in lignosulfonate analysis of industrial problem sets, such as screenings or optimization of process parameters, without compromising analytical accuracy.
Autor/innen der BOKU Wien:
Korntner Philipp
Potthast Antje
Rosenau Thomas
Schedl Andreas
Sumerskii Ivan
Zweckmair Thomas
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Find related publications in this database (Keywords)
Technical lignins
Functional groups
Elemental analysis
Gas chromatography

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