Abstract
A computerized system for voltammetric and chronopotentiometric analysis is described. The system consists of a microcomputerized electrochemical unit and a personal computer (PC) with peripherals. The eletrochemical unit is programmed and activated via a command list entered from the PC keyboard, and then operates independently. Meanwhile, the PC is available for data processing. The system can execute user-defined operations, e.g., voltage steps, measurement of relaxation current, at a frequency of 50 kHz in real time. Thus it affords a flexible means for implementation of standard as well as non-standard voltammetric techniques. The system facilitates a rapid comparison of voltammetric and chronopotentiometric techniques under analogous experimental conditions. Because electrode potentials can be sampled at a frequency as high as 660 kHz, the system is well suited for potentiometric stripping analysis of solutions with a high content of oxidants. The analytical possibilities of the instrument are demonstrated by two examples. In one, square-wave voltammetric and potentiometric stripping approaches are compared for the determination of traces of lead (II) in non-deaerated media. In the other, constant-current chronopotentiometry and square-wave voltammetry are compared for the quantitation of nickel (II) deposited by chemical interaction with a chemically modified electrode.
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