Determination of roxarsone using carbon paste and amberlite LA2 modified carbon paste electrodes

The methods for determination of the growth promoter 4-hydroxy-3-nitrobenze nearsonic acid (Roxarsone) in veterinary product and in poultry drinks have been developed using differential pulse voltammetry with carbon paste and Amberlite LA2 chemically modified carbon paste electrodes. Optimal conditio ns have been found for Roxarsone determination with nonmodified carbon past e electrodes with limit of determination being 3 mu mol L-1. The sensitivit y of the determination was further improved through Amberlite LA2 modificat ion of the carbon paste with limit of determination being 0.1 mu mol L-1. M odification also enabled preliminary accumulation of Roxarsone with the exc hange of the supporting electrolyte.