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In this study, the dissolution rates of pure plattnerite (-PbOsub2/sub) were investigatedas a function of pH, dissolved inorganic carbon (DIC), orthophosphate, and the presenceof chloramines. A continuous stirred tank reactor (CSTR) loaded with 1 g/L ofplattnerite was used to measure the lead dissolution rates. The lead concentration and pHof the effluent were monitored continuously and reached steady-state values within oneday. The dissolution rates were on the order of 10sup-10/sup mol/msup2/sup-min. At all pH valuesstudied (7.5, 8.5, and 10), the dissolution rate increased with increasing DIC, probablydue to the formation of soluble Pb-carbonate complexes. The fastest dissolution rateswere observed at the lowest pH of 7.5. The initial PbOsub2/sub solid and possible transformationproducts were characterized by X-ray diffraction. Includes 16 references, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 9File Size: 1 file , 890 KB