Accumulation and Release of Arsenic from Cast Iron: Impact of Initial Arsenic and Orthophosphate Concentrations.

ABSTRACT: Various iron oxyhydroxide and oxide minerals commonly found in old cast iron pipe scale were shown to exhibit high and similar affinity for arsenate [As(V)] and orthophosphate (PO₄) via adsorption, co-precipitation, and other factors. PO₄ is a common drinking water corrosion inhibitor. This 7.5-year study examined the accumulation and release of As from an old cast iron pipe scale by changing initial As(V) (0, 75, or 180 µg/L as As) and initial PO₄ (0 or 3 mg/L as PO₄) levels in the simulated drinking water. The results showed that sites within the iron scale accumulated As with a large capacity and concentrated 27% of the total amount As in water into the scale during the 7.5-year study. When no PO₄ was added, the As accumulation foll

SUBMITTER: Tang M 

PROVIDER: S-EPMC8083818 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature