Changes in surface-charge adsorption properties of asbestos aging in water were studied in a series constant-pH laboratory experiments. Chrysotile freshly in an inorganic electrolyte has a positive surface below pH 8.9. Charge reversal occurs within about 2 weeks due to more rapid dissolution of chrysotile's outer hydroxide surface relative to the underlying component of the mineral. The inorganic anions _3^-, Cl^-, HCO_3^- , and SO_4^(2-) did not absorb. A constant- model can be used to relate surface to adsorption of protons over the pH range 7-9. At organic matter (NOM) concentrations at or below encountered in natural waters, the particles can sufficient organic matter within 1 day to acquire negative charge. Adsorption of NOM reached a maximum 30 x 10^(-6) mg of C cm^(-2) after 21 h; catechol continued adsorb over 5 days.
No takes yet. Share an insight, caveat, or question.
Bales et al. (1985) studied this question.