Titration of free phenolic groups in pulps 10 th EWLP, Stockholm, Sweden, August 25–28, 2008

Titration of free phenolic groups in pulps 10 th EWLP, Stockholm, Sweden, August 25–28, 2008

The ClO 2 titration method for in situ measurement of free phenolic groups in pulp has been improved to minimize interferences from other groups susceptible to react with ClO 2 . The method is based upon the reaction between free phenolic groups and chlorine dioxide at a temperature of 0°C, in the p...

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Veröffentlicht in:Holzforschung 2009-11, Vol.63 (6), p.705-710
Hauptverfasser: Delmas, Delphine, Lachenal, Dominique, Mortha, Gérard, Marlin, Nathalie, Calais, Christophe
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container_end_page 710
container_issue 6
container_start_page 705
container_title Holzforschung
container_volume 63
creator Delmas, Delphine
Lachenal, Dominique
Mortha, Gérard
Marlin, Nathalie
Calais, Christophe
description The ClO 2 titration method for in situ measurement of free phenolic groups in pulp has been improved to minimize interferences from other groups susceptible to react with ClO 2 . The method is based upon the reaction between free phenolic groups and chlorine dioxide at a temperature of 0°C, in the presence of dimethyl sulfoxide. Theoretically, one free phenolic group consumes two molecules of ClO 2 . The pH of the ClO 2 treatment was advantageously fixed at 6.7 using a phosphate buffer, and a new protocol was proposed to avoid any possible interference of quinone groups (either present in pulp or formed during the procedure) on the residual ClO 2 titration step. The results obtained on isolated lignin samples were compared to those measured by 31 P NMR spectroscopy. The ClO 2 method gave substantially higher values, for reasons which deserve further investigation.
doi_str_mv 10.1515/HF.2009.101
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title Titration of free phenolic groups in pulps 10 th EWLP, Stockholm, Sweden, August 25–28, 2008
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