Analysis of hydroxide, inorganic sulphur species and organic anions in kraft pulping liquors by capillary electrophoresis

Journal of Chromatography. a
Joseph Sullivan, Maurice Douek

Abstract

A new method has been developed for the determination of hydroxide, sulphide, thiosulphate, sulphate, sulphite, chloride, oxalate and formate in kraft green, white and black liquors by capillary electrophoresis. The method provides baseline resolution of all analytes of interest using an electrolyte composed of 10 mM sodium chromate and 2 mM tetradecyltrimethylammonium hydroxide. Separations are conducted under constant current conditions at 25 degrees C and analytes are quantified by indirect UV-detection at 275 nm. A brief, post run wash of the capillary with 0.5 M NaOH and water gave improved inter- and intra-run repeatability of both migration times and peak areas. Sulphide and other oxysulphur species were relatively stable in white and green liquors diluted in helium-sparged water. However, sulphide present in black liquor samples diluted in the same solvent underwent rapid oxidation to form sulphite and thiosulphate. thereby precluding the measurement of all three anions. We discovered that quinone-type compounds present in black liquor catalyze the oxidation of sulphide and that the addition of reduced glutathione at a concentration of I mg/mL during black liquor dilution completely stabilized sulphide, sulphite and thi...Continue Reading

Citations

Oct 24, 2006·Electrophoresis·Gillian WhitakerRaymond G Leonard
Sep 7, 2007·Electrophoresis·Christian W Klampfl
Sep 7, 2007·Electrophoresis·Peter BaldingMirek Macka
Dec 21, 2006·Pain Practice : the Official Journal of World Institute of Pain·Steven H SandersPeter J Vicente
Jul 11, 2007·Chemical Society Reviews·Natalia Maximova, Olli Dahl
Oct 16, 2015·Electrophoresis·Paweł KubalczykRafał Głowacki
Nov 7, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yan-Hong QinTong Zhang

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