Document Detail


Identification and distribution of vanadinite (Pb5(V5+O4)3Cl) in lead pipe corrosion by-products.
MedLine Citation:
PMID:  19603655     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This study presents the first detailed look at vanadium (V) speciation in drinking water pipe corrosion scales. A pool of 34 scale layers from 15 lead or lead-lined pipes representing eight different municipal drinking water distribution systems in the Northeastern and Midwestern portions of the United States were examined. Diverse synchrotron-based techniques, including bulk XANES (X-ray absorption near edge spectroscopy), micro-XANES, micro-XRD (X-ray diffraction), and micro-XRF (X-ray fluorescence) mapping were employed along with traditional powder XRD, SEM-EDXA (scanning electron microscopy-energy dispersive X-ray analysis), and ICP-OES (inductively coupled plasma-optical emission spectrometry) to evaluate vanadium speciation and distribution in these deposits. Vanadinite (Pb5(VO4)3Cl) was positively identified, and occurred most frequently in the surface layers. Low V(tot) in these waters is likely the limiting factor in the abundance of vanadinite in the pipe scales, along with the existence of divalent lead. The occurrence of V in these samples as a discrete mineral is important because it is formed in the presence of very low concentrations of V in the finished water, it provides a mechanism to concentrate microg x L(-1) amounts of V from the water to near-percent levels in the pipe scales, and the robustness of V accumulation and release in response to water chemistry changes is likely different than it would be with a sorption accumulation mechanism. Extrapolation from limited existing water chemistry data in this study provides an estimate of deltaG(f)degrees for vanadinite as approximately -3443 kJ x mol(-1), or less, leading to a log K(s)0 value of approximately -86 for the reaction Pb5(VO4)3CI(s) equilibrium {Pb2+}5 + {VO4(3-) + {Cl-}, in which {} denotes activity.
Authors:
Tammie L Gerke; Kirk G Scheckel; Michael R Schock
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Environmental science & technology     Volume:  43     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-07-16     Completed Date:  2009-08-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4412-8     Citation Subset:  IM    
Affiliation:
Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221-0013, USA.
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MeSH Terms
Descriptor/Qualifier:
Corrosion*
Environmental Monitoring
Lead / chemistry*
Minerals / chemistry
Phosphates / chemistry
Vanadium Compounds / chemistry*
Water / chemistry
Water Pollutants, Chemical / chemistry
Water Supply
X-Ray Diffraction
Chemical
Reg. No./Substance:
0/Minerals; 0/Phosphates; 0/Vanadium Compounds; 0/Water Pollutants, Chemical; 0/chloropyromorphite; 7439-92-1/Lead; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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