Abstract
A further application has been made of the chemical exchange reaction between sulfur dioxide gas and a solution of sodium bisulfite to the problem of securing higher concentrations of sulfur of atomic weight 34. The exchange reaction was carried out in a series of counter-current fractionation columns which previously had been used for the separation of the nitrogen and carbon isotopes. Using three fractionation units in cascade arrangement, we have secured sulfur containing 25 percent S34 at a rate of 3.2 grams per day, and have produced sufficient material for a large number of tracer experiments.
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