On-line measurement of pulp water anions by capillary electrophoresis with fast sequential sampling and dynamic solvent feeding

Heli Siren, Stella Rovio, Teemu Työppönen, Pertti Vastamäki

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This paper demonstrates the use of the first on-line capillary electrophoresis instrument with continuously flowing electrolyte solutions and sequentially applied sample introduction. The system was used in on-line determination of chloride, sulphate and carbonate concentrations of process waters at a pulp mill. The module constructed for on-line feedings of the solvents is described. Separations were performed in a pyromellitic acid-hexamethonium hydroxide-triethanol amine mixture at pH 7.7 with indirect-UV detection at 254 nm. Two standard mixtures were used to show the repeatability of the analysis and to estimate the accuracy of the on-line system. The analytes could be separated within 240 s. Sampling from a pulp machine could be accomplished on-line at 6 minute intervals. On-line tests gave a limit of detection and a limit of determination in the low mg/L range.
Original languageEnglish
Pages (from-to)1136 - 1142
JournalJournal of Separation Science
Issue number15-17
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed



  • on-line capillary electrophoresis
  • pulp waters
  • anions
  • continuous BGE flows

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