A novel method has been developed for determining soluble and insoluble forms of oxalate in pulp and paper samples by ion chromatography. Methanesulphonic acid is used to dissolve insoluble oxalate, and total oxalate is then determined by ion chromatography with suppressed conductivity detection. Soluble oxalate is determined directly by ion chromatography, without prior chemical treatment. Insoluble oxalate is obtained by difference. The method was applied to samples of pulp, process liquors, filtrates, and scale deposits from kraft mills. In kraft mills, considerably higher levels of oxalate were found in the Eop samples compared to those in the brownstock and D0 samples. In both brownstock and Eop samples, oxalate was mainly present in soluble form, whereas the D0-stage contained relatively higher levels of insoluble oxalate.
Reference:
Sithole, B.B., Azeez, A.M and Ramjugernath, D. 2013. A new method for the analysis of soluble and insoluble oxalate in pulp and paper matrices. Journal of Wood Chemistry and Technology, vol. 34, pp 55-66
Sithole, B. B., Azeez, A., & Ramjugernath, D. (2013). A new method for the analysis of soluble and insoluble oxalate in pulp and paper matrices. http://hdl.handle.net/10204/7265
Sithole, Bishop B, AM Azeez, and D Ramjugernath "A new method for the analysis of soluble and insoluble oxalate in pulp and paper matrices." (2013) http://hdl.handle.net/10204/7265
Sithole BB, Azeez A, Ramjugernath D. A new method for the analysis of soluble and insoluble oxalate in pulp and paper matrices. 2013; http://hdl.handle.net/10204/7265.
Copyright: 2013 Taylor & Francis. This is the pre print version. The definitive version is published in Journal of Wood Chemistry and Technology, vol. 34, pp 55-66
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