Studies of the Alkaline Earth Complexes in Various Solutions. III. Calcium(II) and Strontium(II) Complexes with Sulfate and Oxalate Ions in 1m Perchlorate Media

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Abstract
The complex formation of calcium and strontium with sulfate and oxalate ions has been studied in 1 m perchlorate media at 25 °C by a liquid-liquid distribution method. The radioisotopes, calcium-45 and strontium-85 at tracer concentrations were used in conjunction with, thenoyltrifluoroacetone in methylisobutylketone or in carbon tetrachloride containing tributyl-phosphate. The complex formation was determined by a graphical method from the decrease in the extraction of the metal ions with the increases in the concentration of sulfate or oxalate ions in the aqueous phase. The results were explained by the formation of the first and the second complexes, and the stability constants, βn=[MLn2−2n]⁄[M2+][L2−]n, were determined as follows; Sulfate systems, Ca(II): logβ1=1.10, logβ2=1.36, Sr(II): log⁄β1=0.72, logβ2=1.29. Oxalate systems, Ca(II): logβ1=1.66, logβ2=2.69, Sr(II): logβ1=1.25, logβ2=1.90.