Page 89 - Analytical Chemistry I E-book
P. 89
Determination of sulfur-containing compounds
• Sulphur in organic and biological materials is conveniently
determined by burning the sample in a stream of oxygen. The
sulfur dioxide formed during the oxidation is collected by
distillation into a dilute solution of hydrogen peroxide.
Organic S + O2 ⎯→ SO2 (g)
SO2 (g) + H2O2 ⎯→ H2SO4
• The sulfuric acid is then titrated with standard base.
H2SO4 + 2NaOH ⎯→ Na2SO4 + 2H2O
