Apparatus for measuring free and total sulfurous acid and method of measurement.

摘要

The total amount of sulfurous acid in a sample is measured by treating the sample with acid and/or alkali to convert any sulfurous acid-containing compound therein to free sulfurous acid and then measuring the total amount of free sulfurous acid in the sample by an oxidation reaction of free sulfurous acid to sulfuric acid using a bacterium belonging to Thiobacillus thiooxidans or Thiobacillus ferrooxidans.