ASTM D853 Test Method for Hydrogen Sulfide and Sulfur Dioxide Content
ASTM D853 Standard Test Method for Hydrogen Sulfide and Sulfur Dioxide Content (Qualitative) of Industrial Aromatic Hydrocarbons
9. Procedure
9.1 Make a qualitative test for H2S and SO2, at the time of performing the distillation test, see Test Method D850. This is done by hanging a strip of filter paper moistened with the lead acetate solution and a strip of starch paper moistened with the potassium iodate solution on the end of the condenser tube. The strips are placed so that they are suspended in the upper part of the receiving cylinder so that drops of condensate pass between the strips without touching them. If, at the end of the test, the lead acetate paper shows discoloration, H2S is present but not SO2. If the lead acetate paper shows no discoloration but the starch iodate paper develops a blue color, SO2 is present but not H2S. If neither paper shows discoloration, neither H2S nor SO2 is present.
