“…The amount of organic reagent used must be less than that corresponding to the stoichiometric ratio. The method has been used for rapid separations in activation analysis (697,792,943,944)• Similar approaches for determining mercury in plant materials (803) and cobalt in alloys (679) have been suggested by others. As an aid to increased selectivity and specificity in extractions, the theory of masking agents has been treated by Hulanicki (316).…”