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On‐line measurement of pulp water anions by capillary electrophoresis with fast sequential sampling and dynamic solvent feeding
Author(s) -
Sirén Heli,
Rovio Stella,
Työppönen Teemu,
Vastamäki Pertti
Publication year - 2002
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/1615-9314(20021101)25:15/17<1136::aid-jssc1136>3.0.co;2-k
Subject(s) - capillary electrophoresis , detection limit , chemistry , chromatography , repeatability , pulp (tooth) , electrolyte , chloride , hydroxide , analytical chemistry (journal) , electrophoresis , analyte , capillary action , inorganic chemistry , materials science , organic chemistry , medicine , electrode , pathology , composite material
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.