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Electrophoretic mobility studies of colloidal particles in aqueous solutions of various phosphates
Author(s) -
Tokiwa Fumikatsu,
Imamura Tetsuya
Publication year - 1969
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02545004
Subject(s) - electrophoresis , aqueous solution , metaphosphate , phosphate , electrolyte , chemistry , inorganic chemistry , sodium phosphates , adsorption , polyphosphate , hydrous ferric oxides , chromatography , sorption , organic chemistry , electrode
Electrophoretic mobilities of carbon black, titanium dioxide, ferric oxide and bentonite particles have been systematically measured in solutions of a series of sodium polyphosphates and metaphosphates. The mobilities of those particles carrying negative charge in phosphate solutions are relatively high as compared with those in solutions of various electrolytes other than phosphates. This would be indicative of strong adsorption of phosphate ions onto the surface of the particle. In polyphosphate (Na n+2 P n O 3n+1 ) solutions the mobility increases with increasing n in the region of n≤3 and then becomes constant at n>3, while in metaphosphate (Na n P n O 3n ) solutions the mobility is nearly constant independent of n except the case with n of 3. The electrophoretic behavior of the particles is highly dependent on the pH of the solutions—the higher the pH of the solution, the greater the mobility of the particle. However, the mobilities in phosphate solutions are in general much higher than those expected from the pH of the solutions. The electrophoretic data in solutions of acid and neutral phosphates have also been included.