Rotating platinum microelectrode

Amperometric titrations with a rotating platinum microelectrode, and... 

AMPEROMETRIC TITRATIONS WITH A ROTATING PLATINUM MICROELECTRODE... 

The rotating platinum microelectrode was first introduced by Laitinen and Kolthoff in 1941. Figure 17.3 (a) depicts a simple rotating platinum microelectrode which is made out from an usual standard mercury seal . A platinum wire (length 5.0 mm diameter 0.5 mm) protrudes from the lower end wall of a 21... 

Figure 17.3 A Schematic Diagram of Amperometric Titrations with The Rotating Platinum Microelectrode. ...

F = Flange fitted inward of the Hg-Reservoir D = Rotating platinum microelectrode,... 

This class of titration is based on the measurement of the diffusion current at a dropping-mercury electrode or at a rotating platinum microelectrode of the substance being titrated or of the reagent being used. It is known that in polarography the diffusion current obtained from a given ion is proportional to the concentration of that ion at a suitable potential and this fact is used in amperometric titrations. 

Part—III exclusively treats Electrochemical Methods invariably and extensively used in the analysis of pharmaceutical substances in the Official Compendia. Two important methods, namely potentiometric methods (Chapter 16) deal with various types of reference electrodes and indicator electrodes, automatic titrator besides typical examples of nitrazepam, allopurinol and clonidine hydrochloride. Amperometric methods (Chapter 17) comprise of titrations involving dropping-mercury electrode, rotating—platinum electrode and twin-polarized microelectrodes (i.e., dead-stop-end-point method). 

Laitinen, H.A., and I. M. Kolthoff Voltammetric Determinations Amperometric Titrations with a Rotating Microelectrode of Platinum Wire. J. Phys. Chem. 45, 1079 (1941). 

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