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

Determination of the volume of hydrated particles in suspensions by the modified indicator method

R. Kohn

Slovak Academy of Sciences, Bratislava

Abstract: A modification of the 'indicator' method (Dumanskǐi, Kolloidy v pishchevǒi promyshlenosti, Moscow, 1949) for the detn. of the vol. of the hydrated particles in suspension and the amt. of the adsorbed H₂O is described. The basis of this method is that the dipole-oriented H₂O mols. of hydrated layers of particles lose their function as a solvent and the adsorbed H₂O does not take part in dissolving any matter in the suspension. To the known vol. of this dispersion system a definite amt. of the indicator is added. From the change in concn. as compared with the theoretical concn., the vol. of hydrated particles and the amt. of adsorbed H₂O are calcd. Expts. were carried out on colloid coagulates pptd. with lime from beet sugar juice. S₂O₃^--, Cl^-, and I^- were investigated as indicators. S₂O₃^-- and esp. Cl^- were fully suitable for the new modified method but could not be used with the original D. method. I^- was not suitable for either method because of its great adsorption on muddy particles.

Full paper in Portable Document Format: 152a81.pdf (in Slovak)

Chemical Papers 15 (2) 81–94 (1961)