Fig. 2. Example of linear regression of accumulated release vs. time data and the estimates of initial release and release rate obtained from this analysis. Sample D1 at pH 3.7. Cd 
, Cu •, Pb 
.
Fig. 2. Example of linear regression of accumulated release vs. time data and the estimates of initial release and release rate obtained from this analysis. Sample D1 at pH 3.7. Cd , Cu •, Pb .