Voltammetric determination of cyadox using adsorptive accumulation in a flow-through system

Abstract

Cyadox, one of the quinoxaline- N-dioxide derivatives used as a grwoth promoter, has been determined voltammetrically after adsorptive accumulation on the surface of a hanging mercury drop electrode in a flow-injection system. A simple detector slipped onto the capillary of a static mercury drop electrode immersed in an electrolyte solution together with the reference and auxiliary electrodes were used for the detection. With a 1000 μl injected sample volume, a linear calibration plot was obtained at a Cyadox concentration level of 10 −8 mol 1 −1: slope of the calibration line 0.154 nA n M −1, intercept −0.453 nA, standard error 0.091 nA, correlation coefficient 0.999. Diluted blood plasma samples (from pigs) were analyzed using the flow-injection approach and adsorptive accumulation without the necessity of a separation procedure.