The increase in the absorbance of copper ferrocyanide suggested a reduction of copper ions or ferricyanide. With the standard reduction-oxidation potential of 0.58 V for Mn(II)/Mn(III)-citrate (Sanjeeva Reddy 2007 ), it is possible that the ferricyanide and copper system oxidizes Mn 2+ in the presence of citrate.

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Potassium Ferrocyanide; Potassium Ferricyanide; Potassium Thiocyanate; No Reaction; Most common oxidation states: +2, +3; M.P. 1535º; B.P. 2750º; Density 7.87 g/cm 3; Characteristics: Iron is a gray, moderately active metal.