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This paper addresses changes of lead release and colloidal mobilization from lead dioxide(PbOsub2/sub) associated with the introduction of chloramine, presence of natural organic matter (NOM) and addition ofphosphate corrosion inhibitors in drinking water distribution systems. Experimental workshowed that when NOM was present, the surface potential of PbOsub2/sub exhibited a prominentnegative shift and colloidal mobilization of Pb(IV) particles became prominent. The presenceof chloramine did not significantly change these effects of NOM on the colloidal behavior ofPbOsub2/sub. Effects of phosphate corrosion inhibitors on colloidal lead release were examined. Itwas determined that the formation of nano particles of hydroxypyromorphite Pbsub5/sub(POsub4/sub)sub3/subOH greatly decreased lead release. Includes 9 references, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 6File Size: 1 file , 900 KB