The foundation for lead control in drinking water
distribution systems is based on Pb(II) chemistry. In
recent years, however, Pb(IV) oxides have been identified
in distribution systems, suggesting that they may
be important relative to predicting and controlling
lead concentrations at the consumer's tap. Therefore,
a better understanding of the chemistry of Pb(IV) can
be valuable to water utility managers as they make
treatment decisions.
This research shows that the two Pb(IV) dioxide
polymorphs plattnerite and scrutinyite can form in
chlorinated water and that these solids are less soluble
in general than Pb(II) minerals historically used for lead
control strategies. These findings have implications for
water suppliers considering switching to a different
type of disinfectant or making other treatment changes
that could affect redox potential. If Pb(IV) oxides are
in their distribution systems, any changes in redox
potential (e.g., switching disinfectant from free chlorine
to chloramines) could possibly fully reduce those solids
to more soluble Pb(II) forms, potentially resulting in
elevated lead concentrations. Includes 45 references, table, figures.
| Edition : | Vol. 97 - No. 11 |
| File Size : | 1
file
, 440 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 11/01/2005 |
