Determination of vitamin C by differential pulse voltammetry
The voltammetric behavior of vitamin C was studied by differential pulse voltammetry using glassy carbon electrode,and several detection conditions were optimized.Results showed that the oxidation peak potential was at 0.208 V(vs.SCE)in HAc-NaAc butter solution with a pH value of 5.7.There was a good linear relationship between the peak current and vitamin C concentration in the range of 5～400 mg/L,and the detection limit was 1.51 mg/L.In this way the relative standard deviation was 1.47%,and the recoveries were among 95.9% to 103.3%.