Determination of hydrogen peroxide using a potassium hexacyanoferrate(III) modified titanium dioxide electrode

A titanium dioxide electrode modified with potassium hexacyanoferrate(III) was developed. Since potassium hexacyanoferrate(III) has a rapid electron transfer rate, the conductivity of the modified electrode was much better than at a bare titanium dioxide electrode. With this electrode, hydrogen peroxide (from 1.66 x 10(-6) to 3.22 x 10(-3) M) could be determined accurately with a relative standard deviation of less than 7.0%, in the presence of a molar ratio of 1:10 sodium chloride, potassium chloride, potassium bromide, sodium sulfate, beta-D-glucose, or nicotinamide, 1:1 sodium iodide, sulfonic acid, nitric acid, uric acid, or L-ascorbic acid or 1:0.1 L-serine or L-phenylalanine. (C) 1998 Elsevier Science B.V.