Orthophosphate Interactions with Destabilized PbO₂ Scales.

ABSTRACT: This research presents two case studies in which a change in the disinfectant from free chlorine to chloramine caused an increase in lead corrosion. In both systems, the predominantly tetravalent lead (PbO₂) scales destabilized as a result of disinfectant change. Orthophosphate corrosion control was used in both systems, and the effect of this treatment chemical on the destabilized PbO₂ scales was examined. The absence of chemical reactivity between PbO₂ and phosphorus is well known, and this research confirms that phosphorus does not interact with the legacy PbO₂ scales. Instead, phosphorus and calcium were found to permeate through the destabilized PbO₂ material and react with divalent lead [Pb(II)] at the surface of a basal litharge

SUBMITTER: DeSantis MK 

PROVIDER: S-EPMC7739375 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature