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A Contactless Conductometric Detector with Easily Exchangeable Capillary for Capillary Electrophoresis
Author(s) -
Tůma Petr,
Opekar František,
Jelínek Ivan
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200108)13:12<989::aid-elan989>3.0.co;2-c
Subject(s) - capillary action , electrode , detector , detection limit , capillary electrophoresis , materials science , analytical chemistry (journal) , groove (engineering) , chemistry , chromatography , optics , composite material , physics , metallurgy
An alternative construction of a contactless conductivity detector in which semitubular instead of tubular electrodes were used is described. The electrodes are made of a strip of aluminium foil formed into a semitubular shape. They are positioned between two Plexiglass plates in a groove matching the outer diameter of a separation capillary. One Plexiglass plate is immovable, the other is free and can be detached from the immovable plate after the fixing screws are released. The separation capillary is inserted between the plates into the groove and flattened to the electrodes by the tightening of the fixing screws. This construction permits a simple exchange of the separation capillary and makes the connection of individual electrodes with the detector electronics easier and more reliable. The detector performance was tested under the electrophoretic conditions using model sample solutions of potassium chloride in the concentration range from 10 −3 to 10 −8 mol/L. It was shown (for K + ion) that the operational characteristics of the detector with semitubular electrodes, namely dynamic range, 0.5–1000 μM, linear dynamic range, 5–1000 μM, limit of detection, 0.5 μM (LOD here represents the concentration from that the detector signal ceases to change with further concentration decrease) and sensitivity (1.2 mV/pg), are comparable with those for the detectors with common tubular electrodes.