Abstract：The concentration change of Fe3+ to Fe2+ in the preparation process of Fe3O4 from iron mud was determined by cyclic voltammetry (CV), which provided a simple and rapid monitoring method for this technological process. Under the experimental conditions, the Fe3+ and Fe2+ in solution formed reversible redox system, generating a pair of redox peak in good shape. The factors influencing the peak current were investigated, including the scanning rate, pH and interference ions. The results showed that the scanning rate in the range of 0.002-0.01 V/s and pH in the range of 1.5-2.5 had no influence on the oxidation peak current and reduction peak current. SO42- in the solution basically had no interference with the system under experimental conditions. The relationship was linear for Fe3+ in the range of 0.000 8-0.008 4 mol/L with correlation coefficient of 0.999 9. The relative standard deviation (RSD, n=7) was 0.70 %-2.0 %. The proposed method was compared with standard potassium dichromate titrimetry with a relative error of 1.7 %.
李云;王晨雪;尚游;尚世智;郭建伟. 循环伏安法测定溶液中Fe3+和Fe2+浓度比[J]. 冶金分析, 2011, 31(3): 72-75.
LI Yun;WANG Chen-xue;SHANG You;et al.. Study on the concentration of Fe3+to Fe2+ in solution by cyclic voltammetry. , 2011, 31(3): 72-75.
