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

Figure 1

Arrangement for the determination of free and bound SO₂ by the modified Monier-Williams method. (A) Heater, (B) glycerin bath, (C) flask 1, (D) air pump, (E) refrigerant, (F) connector, (G) flask 2, (H) air output.