ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Possibilities of absolute chronoamperometric determination .I.

D. Bustin

Department of Analytical Chemistry, Slovak Technical University, CS-8J237 Bratislava

Abstract: A new analytical application of chronoamperometry as an absolute method of determination of the electroactive substances is described in this paper. Basis of such a determination not requiring standardization is separa­tion of the signal component caused by linear diffusion from that caused by either spherical or cylindrical contribution to the total diffusion current of the determined substance. From the suitable indication electrodes of small sizes the use of hanging mercury drop electrode has been verified within the concentration range of the analyzed Tl⁺ 10^-3 to 10^-4 mol dm^-3 Results of the analysis were accurate and independent of the temperature of the analyzed solution within the range 5—37 °C (with the necessity to keep the temperature constant during several seconds of duration of the chronoam­perometric determination). It has also been shown that the result of the analysis does depend neither on the radius of mercury drop within the range 0.37 to 0.63 mm nor upon the concentration of the electroinactive substances influencing the density and viscosity of the analyzed solution. The signifi­cance of this possibility to use chronoamperometric determination without necessity of standardization follows from the lack of reference samples for standardization which is often observed in the practice.

Full paper in Portable Document Format: 412a203.pdf

Chemical Papers 41 (2) 203–214 (1987)