Abstract
Potassium fluoride and pyrosulfate fusions of soil guarantee strontium is in the ionic state. After dissolving the fusion cake, strontium sulfate is coprecipitated with lead and calcium which are preferentially dissolved into EDTA and discarded. Subsequently, strontium sulfate is dissolved in EDTA and hydrolytic elements are separated on ferric hydroxide. Strontium sulfate is precipitated from EDTA at a lower pH, dissolved in DTPA, and set aside for /sup 90/Y ingrowth. After ingrowth the strontium sulfate is reprecipitated, and the /sup 90/ Y is extracted from the supernate into bis(2-ethyhexyl) phosphoric acid. When both /sup 89/Sr and /sup 90/Sr are being determined, barium chromate is separated from a DTPA solution of strontium. Strontium sulfate is precipitated from the barium chromate supernate and counted for /sup 89/Sr plus /sup 90/Sr. Yttrium-90 is counted on yttrium oxalate to determine /sup 90/Sr, and /sup 89/Sr is determined by difference. Precision, accuracy, sensitivity, and the effects of interferences are discussed. 4 tables, 1 figure.
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