ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Physicochemical study of beet-sugar juice purification. II. The determination of ζ electrokinetic potential of crystalline calcium carbonate in calcium hydroxide and calcium bicarbonate solutions by the electro.ovrddot.osmotic method

J. Vašátko and R. Kohn

Slovak Academy of Sciences, Bratislava

Abstract: The ζ electrokinetic potential (I) measurements in Ca(OH)₂ solns. were carried out on coarse cryst. CaCO₃, with particle size 5-10 μ, and on fine cryst. CaCO₃, with particle size 1.0-1.8 μ. The particles of cryst. CaCO₃ showed in all solns. pos. I with max. approx. in solns. of 0.002-0.004N. The max. I of the CaCO₃/Ca(OH)₂ system on coarse cryst. CaCO₃ had the value +26.6 mv., and on the fine cryst.; +32.1 mv. I of the system coarse CaCO₃/Ca(HCO₃)₂ highly purified soln. showed the max. value of +22.5 my., for lower pure Ca(HCO)₂, a value of +17.3 mv. The dependence of I on the concn. of Ca(HCO₃)₂ and Ca(OH)₂ solns. is shown in 2 diagrams. The decrease of I at higher concns. of Ca(OH)₂ and Ca(HCO₃)₂. solns. is not caused by the electrolytic transfer of liquid.

Full paper in Portable Document Format: 103a141.pdf (in Slovak)

Chemical Papers 10 (3) 141–155 (1956)