The small amount of sulphate (1∼5 mg/100 ml as SO4) can be determined by using high frequency wave titration method with M/62-barium chloride solution in 50% methanol medium under the condition pH 6.0 ± 0.1 and 20° ± 2. The precipitation ratio of barium-sulphate at an end point was about 99.2% when neglecting thier ion-adsorption.
The end points in this method are given as the sharp peak in the BaCl2 cc-μA diagrams. Satisfactory results were given when this method was applied to rapid determination of sulpher in iron and steels, and the analytical error in this method was about 2%.
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