In a message dated 9/22/2001 8:42:44 PM Eastern Daylight Time, [email protected] writes:
> Subj:Re: CS>500 PPM > Date:9/22/2001 8:42:44 PM Eastern Daylight Time > From: [email protected] (Marshall Dudley) > Reply-to: <A HREF="mailto:[email protected]";>[email protected]</A> > To: [email protected] > > > > > Is not the solubility limit of silver ions about 11 PPM? Marshall > Marshall: I think that figure was arrived at from Frank's THEORETICAL calculation for a pure silver carbonate system. Unfortunately, it may not be that simple. For one thing, the concentration of dissolved CO2 may be highly variable (i.e., not in equilibrium with the CO2 in the air). Secondly, the presence of hydroxyl ion (produced from the cathodic, half cell reaction) may form complex oxy-carbonates (similar to basic sulfates found in several metal - sulfur - oxygen systems such as Cd, Zn and Cu) which could have a much higher solubility. Third, solubility product calculations assume equilibrium which may not always be attained especially with species which need a relatively high activation to nucleate solid particles. Roger
