Record Display for the EPA National Library Catalog
RECORD NUMBER: 30 OF 52
|OLS Field Name||OLS Field Data|
|Main Title||Polyphosphate water-treatment products : their effects on the chemistry and solubility of lead in potable water systems /|
|Author||Holm, Thomas R. ; Smothers, S. H. ; Xiaofeng, Z. ; Schock, R. R.|
|CORP Author||Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. ;Illinois State Water Survey Div., Champaign.|
|Publisher||U.S. Environmental Protection Agency, Office of Research and Development, Risk Reduction Engineering Laboratory,|
|Additional Subjects||Potable water ; Lead(Metal) ; Complex ions ; Mathematical models ; Water pollution ; Water chemistry ; Phosphorus polymers ; Water treatment ; Water softening ; Toxic substances ; Solubility ; Chemical equilibrium ; Plumbing ; Corrosion inhibitors ; Reprints|
|Edition||"Contract report 579."|
|Collation||16 pages : illustrations ; 28 cm|
Three commercial polyphosphate-containing water treatment products were evaluated for their ability to affect lead solubility in drinking water. A 'Competing-Ligand Spectrophotometry' Technique was used to characterize Pb(2+) complexation at 20 degrees C in ionic strength of 0.1, pH = 8, and calcium concentration of .001 mol/L. The pH was buffered by HEPES, and the colorimetric reagent was 4-(2-pyridylazo)-resourcinol (PAR). Results were also compared to a DPASV method. The data was fit by a 2- ligand model. The experiments suggested a significant ability to enhance lead solubility by complexation at the pH and hardness tested.
"Michael R. Schock, project officer." "EPA/600/D-91/057." "Published in the Water Qaultiy Technology Congerence, Philadelphia, PA, November 12-16, 1989, pp: 511-523." Microfiche.