AWWA WQTC69498

This powerpoint presentation begins by providing a brief overview of water chemistry impacting lead mineralogy,solubility, and particle properties. Study objectives were to: describe lead synthesis experiments conducted tomodel the impact of water quality on lead particlesand solubility;develop a model system that can be used for leadsolubility studies; and,understand how phosphates impact themorphology and solubility transformations withtime. Synthesis and analysis of methods are presented, along with particle synthesis results for chlorine and age, orthophosphates, and polyphosphates. Presentation conclusions indicate the following: precipitation experiments provide a simple meansof understanding fundamental interactions of leadmineralogy;morphological and surface analysis can helpexplain the results of studies that observeddecreased lead solubility after disinfectant change(ORP) and the formation of Pb(IV) compounds inthe absence of phosphates;addition of other types of phosphates impactedthe mineralogy and transformation compared tothe phosphate-free samples; chemical analysis associated with transformationand surface morphology will provide useful insightinto dissolution of lead in water; and,lead pyrophosphates and other metalpyrophosphates could conceivably form in realDWDS and more work is needed to determine thekinetic and synthetic boundaries. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

20

File Size:

1 file , 2.4 MB