Sulfur dioxide vapor reagent

Sulfonates, aliphatic 388, 389 Sulfonic acids 91 Sulfur dioxide, dipole moment 97 Sulfur dioxide vapor reagent 86 Sulfuric acid, reagent 87,195, 333,411,426 Sulfurous acid reagent (alternative to 2-mer-captoethanol) 381 Sulfuryl chloride vapor reagent 86... 

A limited amount of work has been carried out on the effect of pollutants. Sulfur dioxide decreased the amount of iodine liberated from all reagents the difference between reagents II and III was small. Nitrogen dioxide yielded 8 to 11% interference with reagent III, and about the same with II. Five tests with 500 p.p.m. of nitric acid vapor showed an average interference of 0.5 p.p.m. of ozone with reagent III. Interferences from other smog constituents have not been completely evaluated. 

In addition to iodine, other detection reagents (e.g., bromine, chlorine, formaldehyde, ammonia, diethylamine, HCl, sulfuryl chloride, sulfur dioxide, oxides of nitrogen, and ammonium bicarbonate) (see Section 11) can be applied as vapors. 

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