approximately 0.4 mg/L for all tested pHs; however, that
difference decreased with time. For example, at pH 8.0 and
after 24 h of aging, soluble copper was 0.12 mg/L and 0.043
mg/L as determined by filtration and centrifugation, respectively. Thus, the solubility product log K was between
7.9 and 7.4. After 1 month, however, soluble copper levels
were 0.043 ( 0.005 mg/L for both approaches.