Abstract
The ζ-potential at the interfaces between degummed silk fibre and the aqueous solutions containing a number of trivalent metal nitrates was measured by means of the streaming potential method. The trivalent metals used were Al, Ga, In, Cr, Fe, Rh, Sc, Y, La, Sm, Tb, Er and Yb.At pH 5.0, generally, the negative ζ-potential decreases with increasing concentration of metal salt. In the cases of Al, Ga, In, Cr, Fe, Rh and Sc, it reverses its sign at concentrations in the region of 10-6-10-4M and then approaches a limiting positive value which differs for each metal salt: the sequence for the reversal of charge concentrations is Fe Ga>Rh. In the cases of Al, In, Cr and Sc, with increasing concentration of metal salt, the ζ-potential decreases and nearly becomes zero at concentrations in the region of 10-6-10-5M. At higher concentrations it rises slightly. In other cases, the ζ-potential decreases with increasing concentration of metal salt and reaches a negative value. The decrease in the ζ-potential is due to the adsorption of nitrate ions: this was discussed by measuring the ζ-potential for potassium nitrate.
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