サンセットエローのポーラログラフィー

Sunset Yellow (SY) shows a well defined wave in various buffer solutions of pH values between 2 and 10. It's half-wave Potential (E_<1/2>) does not depend on the kinds of buffer components, their concentrations and the addition of potassium chloride. E_<1/2> shifts about 70 mV/pH unit at pH values between 2 and 8 , while at the other pH values higher than 8 shifts about 42 mV/pH unit. The height of the wave is independent of pH, and is remarkably affected by the increase of ionic strength (μ). SY is reduced to amines by accepting four electrons per molecule through the whole electrode process.