Selective Determination Of Trace Amounts Of Total And Sulfate-Sulfur In Glasses

A new method for the determination of sulfur in various glasses at the ug.g-1 level is developed. The finely-powdered glass is decomposed with hydrofluoric acid and hydrochloric acid. During the procedure, a small amount of hydrogen peroxide is added in order to depress the volatilization of reductive sulfur. The total-sulfur in the residue is then reduced to sulfide by heating with a reducing reagent. Thus, liberated hydrogen sulfide is trapped as sulfate ion in oxidation traps which consist of hydrogen peroxide and sodium hdyroxide.