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Spectrophotometric determination of the activity of strontium and calcium ions by the metal-indicator method

R. Kohn

Institute of Chemistry, Slovak Academy of Sciences, 809 33 Bratislava

 

Abstract: Tetramethylmurexide metallochromic indicator was used for spectrophotometric detn. of the activity of Sr2+ ions. Single-ion activity coeffs. γSr2+ as detd. in mixed solns. of SrCl2 and KCl (ionic strength I ≤ 0.05), are in a very good agreement with those calcd. according to Debye and Hueckel equation (ΔγSr2+ < +0.005); at a higher ionic strength I = 0.10-0.15, ΔγSr2+ = +0.02. This method is suitable for detn. of the activity aSr2+ at (0.1 -2.0) × 10-3. The effect of some simple salts on the detn. of the Sr2+ and Ca2+ activity has been described. The use of Debye and Hueckel equation and MacInnes' convention for the calcn. of single-ion activity coeffs. γSr2+ and γCa2+ in dil. solns. of SrCl2 (I ≤ 0.05) and CaCl2 (I ≤ 0.15) was confirmed.

Full paper in Portable Document Format: 285a625.pdf

 

Chemical Papers 28 (5) 625–632 (1974)

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