Investigation of electrochemical behaviours of tetrasodium; 3-[[4-[ [4-[(6-amino-1-hydroxy-3-sulphonato-2-naphthylazo)]-6-sulphonato-1-naphthyl]azo]-1-naphthyl]azo] naphthalene-1,5-disulphonate (direct blue 71)

Electrochemical behaviours of an azo dye derivative; tetrasodium; 3-[[4-[ [4-[(6-amino-1-hydroxy-3-sulphonato-2-naphthylazo)]-6-sulphonato-1-naphthyl]azo]-1-naphthyl]azo] naphthalene-1,5 disulphonate (Direct Blue 71) were investigated by using voltammetric techniques such as differential pulse voltammetry, square wave voltammetry, cyclic voltammetry and sampled current polarography in Britton -Robinson buffer at range of pH 2-12. It was observed that the electrode reaction depends on pH value of the solution and the electrode reaction shifts negative potentials due to the increase in pH. Electrochemical studies indicated that the number of protons which take place in electrode reaction were different in acidic and basic media. An irreversible reduction process with adsorption occured in acidic media. It was concluded that azo dye has a complex reduction mechanism.