Contribution of Partially Labile Complexes to the DGT Metal Flux
Penetration of complexes into the resin layer can dramatically increase the contribution of complexes to the metal flux measured with a DGT (diffusive gradients in thin films) sensor, but equations to describe this phenomenon were not available. Here, simple approximate analytical expressions for th...
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| Veröffentlicht in: | Environmental science & technology 2011-06, Vol.45 (12), p.5317-5322 |
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| creator | Uribe, Ramiro Mongin, Sandrine Puy, Jaume Cecília, Joan Galceran, Josep Zhang, Hao Davison, William |
| description | Penetration of complexes into the resin layer can dramatically increase the contribution of complexes to the metal flux measured with a DGT (diffusive gradients in thin films) sensor, but equations to describe this phenomenon were not available. Here, simple approximate analytical expressions for the metal flux, the lability degree and the concentration profiles in a DGT experiment are reported. Together with the thickness of the reaction layer in the gel domain, the effective penetration distance into the resin layer that would be necessary for full dissociation of the complex (λML) plays a key role in determining the metal flux. An increase in the resin-layer thickness (r) effectively increases the metal flux and the lability degree until r ≈ 3λML. For the usual DGT configuration, where the thickness of the gel layer exceeds that of the resin layer, the complex is labile if r > (D ML/k d)1/2, where D ML is the diffusion coefficient of the metal complex and k d its dissociation rate constant. A general procedure for estimating the lability of any complex in a standard DGT configuration is provided. |
| doi_str_mv | 10.1021/es200610n |
| format | Article |
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Here, simple approximate analytical expressions for the metal flux, the lability degree and the concentration profiles in a DGT experiment are reported. Together with the thickness of the reaction layer in the gel domain, the effective penetration distance into the resin layer that would be necessary for full dissociation of the complex (λML) plays a key role in determining the metal flux. An increase in the resin-layer thickness (r) effectively increases the metal flux and the lability degree until r ≈ 3λML. For the usual DGT configuration, where the thickness of the gel layer exceeds that of the resin layer, the complex is labile if r > (D ML/k d)1/2, where D ML is the diffusion coefficient of the metal complex and k d its dissociation rate constant. 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Sci. Technol</addtitle><description>Penetration of complexes into the resin layer can dramatically increase the contribution of complexes to the metal flux measured with a DGT (diffusive gradients in thin films) sensor, but equations to describe this phenomenon were not available. Here, simple approximate analytical expressions for the metal flux, the lability degree and the concentration profiles in a DGT experiment are reported. Together with the thickness of the reaction layer in the gel domain, the effective penetration distance into the resin layer that would be necessary for full dissociation of the complex (λML) plays a key role in determining the metal flux. An increase in the resin-layer thickness (r) effectively increases the metal flux and the lability degree until r ≈ 3λML. For the usual DGT configuration, where the thickness of the gel layer exceeds that of the resin layer, the complex is labile if r > (D ML/k d)1/2, where D ML is the diffusion coefficient of the metal complex and k d its dissociation rate constant. A general procedure for estimating the lability of any complex in a standard DGT configuration is provided.</description><subject>Animal, plant and microbial ecology</subject><subject>Applied ecology</subject><subject>Biological and medical sciences</subject><subject>Cadmium - chemistry</subject><subject>Diffusion</subject><subject>Ecotoxicology, biological effects of pollution</subject><subject>Environmental Measurements Methods</subject><subject>Estimating techniques</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Ligands</subject><subject>Metals</subject><subject>Nitrilotriacetic Acid - chemistry</subject><subject>Resins</subject><subject>Resins, Synthetic - chemistry</subject><subject>Techniques</subject><subject>Thin films</subject><issn>0013-936X</issn><issn>1520-5851</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpl0MFKAzEQBuAgiq3Vgy8gQRDxsDpJmt30plRbhYoeKnhbZtMsrqSbmuyCvr0pra3oKTl8_DPzE3LM4JIBZ1cmcICUQb1DukxySKSSbJd0AZhIBiJ97ZCDEN4BgAtQ-6TDWQpKCuiS66GrG18VbVO5mrqSPqNvKrT2i06wqKyhQzdfWPNpAm0cbd4MvR1P6aNp0NKRbT8PyV6JNpij9dsjL6O76fA-mTyNH4Y3kwT7ImuSgUZtxKzPJahCi7QoCsbkQDKUKCSi1hpl_PQlCCUKUMhTbsqBkbyfZshEj5yvchfefbQmNPm8CtpYi7VxbciVgoxFClGe_pHvrvV1XC5XmcxiPCzjLlZIexeCN2W-8NUc_VfOIF-Wmm9KjfZkHdgWczPbyJ8WIzhbAwwabemx1lXYunh1vOaXQx22S_0f-A2kx4gZ</recordid><startdate>20110615</startdate><enddate>20110615</enddate><creator>Uribe, Ramiro</creator><creator>Mongin, Sandrine</creator><creator>Puy, Jaume</creator><creator>Cecília, Joan</creator><creator>Galceran, Josep</creator><creator>Zhang, Hao</creator><creator>Davison, William</creator><general>American Chemical Society</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QO</scope><scope>7ST</scope><scope>7T7</scope><scope>7U7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope><scope>SOI</scope><scope>7X8</scope></search><sort><creationdate>20110615</creationdate><title>Contribution of Partially Labile Complexes to the DGT Metal Flux</title><author>Uribe, Ramiro ; Mongin, Sandrine ; Puy, Jaume ; Cecília, Joan ; Galceran, Josep ; Zhang, Hao ; Davison, William</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a437t-9cace3d42508bc36bbb115951a5a35aaccca535a450383b08a262ef9e52467a13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Animal, plant and microbial ecology</topic><topic>Applied ecology</topic><topic>Biological and medical sciences</topic><topic>Cadmium - chemistry</topic><topic>Diffusion</topic><topic>Ecotoxicology, biological effects of pollution</topic><topic>Environmental Measurements Methods</topic><topic>Estimating techniques</topic><topic>Fundamental and applied biological sciences. 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An increase in the resin-layer thickness (r) effectively increases the metal flux and the lability degree until r ≈ 3λML. For the usual DGT configuration, where the thickness of the gel layer exceeds that of the resin layer, the complex is labile if r > (D ML/k d)1/2, where D ML is the diffusion coefficient of the metal complex and k d its dissociation rate constant. A general procedure for estimating the lability of any complex in a standard DGT configuration is provided.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>21608530</pmid><doi>10.1021/es200610n</doi><tpages>6</tpages></addata></record> |
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| subjects | Animal, plant and microbial ecology Applied ecology Biological and medical sciences Cadmium - chemistry Diffusion Ecotoxicology, biological effects of pollution Environmental Measurements Methods Estimating techniques Fundamental and applied biological sciences. Psychology Ligands Metals Nitrilotriacetic Acid - chemistry Resins Resins, Synthetic - chemistry Techniques Thin films |
| title | Contribution of Partially Labile Complexes to the DGT Metal Flux |
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