Abstract
The performance characteristics of an electrochemical detector for liquid chromatography based on a sol-gel carbon composite working electrode in a wall-jet configuration are described. The new detector combines the versatility of sol-gel processes with several favorable characteristics, including fast electron-transfer kinetics, mechanical rigidity and renewability. Factors influencing the amperometric response are explored and optimized. Detection limits of 58–170 pg are reported for various neurotransmitters. Repetitive injections yield peak heights with relative standard deviations of 2.6–3.7%. The prospects of using sol-gel derived electrochemical detectors are discussed.
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