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

Abstract

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, sulfate, and carbonate concentrations of process waters at a pulp mill. The module constructed for on‐line feeding 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.

Overview of Analytical Procedures for Fatty and Resin Acids in the Papermaking Process

“…chloride, oxalate, formate, and acetate) in paper mill waters (Sirén et al 2000(Sirén et al , 2002Kokkonen et al 2004). This online procedure has been applied to several process machines at pulp and paper mills.…”

Overview of the status and applications of capillary electrophoresis to the analysis of small molecules

“…A special sample vial was developed [83] for online coupling to a commercially available CE-instrument. In a separate development [84] an on-line capillary electrophoresis instrument with continuously flowing electrolyte solutions and sequentially applied sample introduction was reported. The system was used for the on-line determination of chloride, sulfate, and carbonate ions in process waters at a pulp mill.…”

Process control and drug analysis with an on-line capillary electrophoresis system

“…The on-line CE system used in the studies was an on-line system patented by the Technical Research Centre of Finland, VTT Processes (Espoo, Finland) and recently described [19]. Briefly, it is a system that can be on-line coupled with process machines.…”

“…As far as we know, the only true on-line CE instrument suitable for on-line measurements in industry is that developed and built in our laboratory featuring continuous flows of solvents and dynamic sample delivery [18,19].…”