Evidence for Localization of Reaction upon Reduction of Carbon Tetrachloride by Granular Iron
The distribution of reaction sites on iron particles exposed to water containing carbon tetrachloride has been examined by measuring the locations of reaction products. The uniformity or localization of reaction sites has implications for understanding and modeling the reduction of environmental con...
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| Veröffentlicht in: | Langmuir 2002-10, Vol.18 (20), p.7688-7693 |
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| creator | Gaspar, Daniel J Lea, A. Scott Engelhard, Mark H Baer, Donald R Miehr, Rosemarie Tratnyek, Paul G |
| description | The distribution of reaction sites on iron particles exposed to water containing carbon tetrachloride has been examined by measuring the locations of reaction products. The uniformity or localization of reaction sites has implications for understanding and modeling the reduction of environmental contaminants by iron in groundwater systems. Granular iron surfaces similar to those being used for environmental remediation applications were studied using surface analysis techniques to develop an understanding of the physical and chemical structure of the surface and oxide films. Scanning Auger microscopy and imaging time-of-flight secondary ion mass spectroscopy revealed that granular iron exposed to carbon tetrachloride saturated water exhibits chloride-enriched regions with a high degree of localization. These results indicate that significant CCl4 reduction occurred at pits rather than on the passive oxide film on the metal. |
| doi_str_mv | 10.1021/la025798+ |
| format | Article |
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Scanning Auger microscopy and imaging time-of-flight secondary ion mass spectroscopy revealed that granular iron exposed to carbon tetrachloride saturated water exhibits chloride-enriched regions with a high degree of localization. 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Scott</creatorcontrib><creatorcontrib>Engelhard, Mark H</creatorcontrib><creatorcontrib>Baer, Donald R</creatorcontrib><creatorcontrib>Miehr, Rosemarie</creatorcontrib><creatorcontrib>Tratnyek, Paul G</creatorcontrib><creatorcontrib>Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)</creatorcontrib><title>Evidence for Localization of Reaction upon Reduction of Carbon Tetrachloride by Granular Iron</title><title>Langmuir</title><addtitle>Langmuir</addtitle><description>The distribution of reaction sites on iron particles exposed to water containing carbon tetrachloride has been examined by measuring the locations of reaction products. The uniformity or localization of reaction sites has implications for understanding and modeling the reduction of environmental contaminants by iron in groundwater systems. Granular iron surfaces similar to those being used for environmental remediation applications were studied using surface analysis techniques to develop an understanding of the physical and chemical structure of the surface and oxide films. Scanning Auger microscopy and imaging time-of-flight secondary ion mass spectroscopy revealed that granular iron exposed to carbon tetrachloride saturated water exhibits chloride-enriched regions with a high degree of localization. These results indicate that significant CCl4 reduction occurred at pits rather than on the passive oxide film on the metal.</description><subject>CARBON TETRACHLORIDE</subject><subject>CATALYTIC EFFECTS</subject><subject>CHEMICAL REACTION KINETICS</subject><subject>chlorinated solvents</subject><subject>corrosion behavior</subject><subject>elemental iron</subject><subject>Environmental Molecular Sciences Laboratory</subject><subject>ENVIRONMENTAL SCIENCES</subject><subject>GEOCHEMISTRY</subject><subject>GROUND WATER</subject><subject>groundwater</subject><subject>IRON</subject><subject>IRON OXIDES</subject><subject>kinetics</subject><subject>REDUCTION</subject><subject>REMEDIAL ACTION</subject><subject>zero-valent iron</subject><issn>0743-7463</issn><issn>1520-5827</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNplkEtLw0AUhQdRsFYX_oOALgSJ3swjkywl1Fqp2JdLGSY3E5oaMzKTivXXG6114-beA-fjwDmEnEZwFQGNrmsNVMg0udwjvUhQCEVC5T7pgeQslDxmh-TI-xUApIynPfI8eK8K06AJSuuCsUVdV5-6rWwT2DKYGY0_ev3WnZkp1rizMu3yTi1M6zQua-u6mCDfBEOnm3WtXTBytjkmB6WuvTn5_X3ydDtYZHfh-HE4ym7GoWYU2rDguuB5CVzHwDlP8lTStGuhEUScADJZ8jhNqeBSFBRzxmkJOTKDwDEWJeuTs22u9W2lPFatwSXapjHYqkhABDJiHXWxpdBZ750p1ZurXrXbqAjU93pqt16Hhlu08q35-OO0e1GxZFKoxWSu4of55H6aCTXt-PMtr9GrlV27pqv7P_YLysZ7pA</recordid><startdate>20021001</startdate><enddate>20021001</enddate><creator>Gaspar, Daniel J</creator><creator>Lea, A. 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Scott</creatorcontrib><creatorcontrib>Engelhard, Mark H</creatorcontrib><creatorcontrib>Baer, Donald R</creatorcontrib><creatorcontrib>Miehr, Rosemarie</creatorcontrib><creatorcontrib>Tratnyek, Paul G</creatorcontrib><creatorcontrib>Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Langmuir</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gaspar, Daniel J</au><au>Lea, A. Scott</au><au>Engelhard, Mark H</au><au>Baer, Donald R</au><au>Miehr, Rosemarie</au><au>Tratnyek, Paul G</au><aucorp>Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Evidence for Localization of Reaction upon Reduction of Carbon Tetrachloride by Granular Iron</atitle><jtitle>Langmuir</jtitle><addtitle>Langmuir</addtitle><date>2002-10-01</date><risdate>2002</risdate><volume>18</volume><issue>20</issue><spage>7688</spage><epage>7693</epage><pages>7688-7693</pages><issn>0743-7463</issn><eissn>1520-5827</eissn><abstract>The distribution of reaction sites on iron particles exposed to water containing carbon tetrachloride has been examined by measuring the locations of reaction products. The uniformity or localization of reaction sites has implications for understanding and modeling the reduction of environmental contaminants by iron in groundwater systems. Granular iron surfaces similar to those being used for environmental remediation applications were studied using surface analysis techniques to develop an understanding of the physical and chemical structure of the surface and oxide films. Scanning Auger microscopy and imaging time-of-flight secondary ion mass spectroscopy revealed that granular iron exposed to carbon tetrachloride saturated water exhibits chloride-enriched regions with a high degree of localization. These results indicate that significant CCl4 reduction occurred at pits rather than on the passive oxide film on the metal.</abstract><cop>United States</cop><pub>American Chemical Society</pub><doi>10.1021/la025798+</doi><tpages>6</tpages></addata></record> |
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| source | American Chemical Society Publications |
| subjects | CARBON TETRACHLORIDE CATALYTIC EFFECTS CHEMICAL REACTION KINETICS chlorinated solvents corrosion behavior elemental iron Environmental Molecular Sciences Laboratory ENVIRONMENTAL SCIENCES GEOCHEMISTRY GROUND WATER groundwater IRON IRON OXIDES kinetics REDUCTION REMEDIAL ACTION zero-valent iron |
| title | Evidence for Localization of Reaction upon Reduction of Carbon Tetrachloride by Granular Iron |
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