Impulse-response functions of flow-through detectors based on the membrane-stabilised liquid-liquid interface Part I. Mathematical treatment

✍ Scribed by Stefan Wilke; Roswitha Picht

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 863 KB
• Volume: 291
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)85125-5

✦ Synopsis

Based on mass transfer across a single diffusion layer at a planar electrode surface, analytical expressions of concentration profiles at the electrode surface and for the dynamic response of amperometric and potentiometric electrochemical detectors after application of an infinitely short concentration pulse GMunction) were derived using Laplace transformation. The data describing the maximum of these impulse-response functions are presented. It was found, that the response achieved with dc amperometry is almost twice as fast as with potentiometry and ac amperometry. Furthermore, the common dc amperometric technique has the advantage that the maximum of the impulse-response function is closer to the steady state than in potentiometry and ac amperometry.