Critical Comparison between Modified Monier-Williams and Electrochemical Methods to Determine Sulfite in Aqueous Solutions

Figure 2

Cyclic voltammetry of (a) 10 mM SO₃₋₂ solution at pH 9.5. (b) 1 mM gallic acid solution and (c) a gallic acid-sodium sulfite mixture. Initial concentration 10 mM, pH 9.5. Scan rate 0.1 mVs⁻¹.

(a)

(b)

(c)