Micronalytical Application Or A Kissinger Type Thin Layer Cell Polarized By Lsv, Npv and Dpv Excitation

Abstract

Three methods were tried and proven to be useful for the polarization of a thin layer cell. the main advantage of making the measurements with Kissinger type cells filled with quiescent solution is that less than 50, uL sample can be measured. the sensitivity is apparently the highest by using NPV, but its application is not advised because of the relatively high charging current content of the signal.

DPV is an excellent method both from the point of view of its sensitivity (at high E it is superior) and very good selectivity as well.

The LSV method proved to be good one and the simplest method when reversible systems must be measured. the steady state limiting current gives a possibility to carry out measurements with high sensitivity, and a 1x10(-7)M/dm³ lower detection limit was found by applying it.

The optimization procedure left chances for further refinements when computerized insturments were used. the sigmoid type current at the LSV technique certainly would give better selectivity, when the digital first derivative of the curve is used.

Key Words:

• Thin layer LCEC detector
• microanalytical application
• LSV
• NPV
• DPV excitation