Miniaturized movable contactless conductivity detection cell for capillary electrophoresis.

A miniaturized capacitively coupled contactless conductivity detector (mini-C(4)D) cell has been designed which is small enough to allow it to slide along the effective capillary length inside the capillary cassette of an Agilent capiillary electrophoresis system (CE) (or other CE brand of similar construction), including the possibility of positioning it close to the point of optical detection (4 cm), or even putting two such detector cells in one cassette. The cell was tested and the performance characteristics (noise, sensitivity, and peak width) were compared with those obtained with the previously used large C(4)D cell. No significant differences were observed.

Comparison of high-performance capillary electrophoresis and liquid chromatography with ultraviolet detection for the isomers of o-, m-, and p-diphenol.

The separation conditions and determination of isomers of o-, m-, and p-diphenol in wastewater by high-performance capillary electrophoresis (HPCE) and HPLC with ultraviolet detection at 280 nm have been studied systematically. The study showed that both methods gave comparable results in retention time, linear range, recovery, reproducibility, and the amount of diphenols in real samples.