Stripping Voltammetry as a Possible Primary Method for Amount of Substance

Stripping voltammetry analysis using a hemispheroidal mercury microelectrode is assessed as a possible candidate "primary method" for amount of substance measurement. It has been shown that this measurement methodology can be described completely by a set of measurement equations. Novel proposals are made to improve the accuracy and traceability of the quantification process by measuring the limiting deposition current over an optimum time instead of employing an analyte stripping step. The range of application and the limitations of the technique are discussed, and the requirement for underpinning traceability from electrical standards is shown. It is concluded that the lack of amount-independent diffusion coefficient data limits the status of the technique to a high-accuracy "definitive method" at present