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| Title: | Determining chemical activity of (semi)volatile compounds by headspace solid-phase microextraction |
| Author (s): | Legind, C.H. Karlson, U. Burken, Joel G. Reichenberg, F. Mayer, P. |
| Department/Lab Affiliations: | Civil, Architectural & Environmental Engineering Environmental Research Center |
| Keywords: | (Semi)volatile compounds. Determining chemical activity. Microextraction. Solid-phase. |
| Issue Date: | 2007 |
| Publisher: | American Chemical Society |
| Citation: | Legind, C.H., Karlson, U., Burken, J.G., Reichenberg, F., and Mayer, P. (2007) "Determining chemical activity of (semi)volatile compounds by headspace solid phase microextraction" Analytical Chemistry, 79(7); 2869-2876. |
| Abstract: | This research introduces a new analytical methodology for measuring chemical activity of nonpolar (semi)volatile organic compounds in different sample matrices using automated solid-phase microextraction (SPME). The chemical activity of an analyte is known to determine its equilibrium concentration in the SPME fiber coating. On this basis, SPME was utilized for the analytical determination of chemical activity, fugacity, and freely dissolved concentration using these steps: (1) a sample is brought into a vial, (2) the SPME fiber is introduced into the headspace and equilibrated with the sample, (3) the SPME fiber is injected into the GC for thermal desorption and analysis, and (4) the method is calibrated by SPME above partitioning standards in methanol. Model substances were BTEX, naphthalene, and alkanes, which were measured in a variety of sample types: liquid polydimethylsiloxane (PDMS), wood, soil, and nonaqueous phase liquid (NAPL). Variable sample types (i.e., matrices) had no influence on sampling kinetics because diffusion through the headspace was rate limiting for the overall sampling process. Sampling time was 30 min, and relative standard deviations were generally below 5% for homogeneous solutions and somewhat higher for soil and NAPL. This type of activity measurement is fast, reliable, almost solvent free, and applicable for mixed-media sampling. |
| Type: | Article - Journal text |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. FULL COPYRIGHT INFORMATION: |
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| title | Determining chemical activity of (semi)volatile compounds by headspace solid-phase microextraction |
| contributor.author | Legind, C.H. |
| contributor.author | Karlson, U. |
| contributor.author | Burken, Joel G. |
| contributor.author | Reichenberg, F. |
| contributor.author | Mayer, P. |
| contributor.deptlab | Civil, Architectural & Environmental Engineering |
| contributor.deptlab | Environmental Research Center |
| subject | (Semi)volatile compounds. |
| subject | Determining chemical activity. |
| subject | Microextraction. |
| subject | Solid-phase. |
| date.issued | 2007 |
| publisher | American Chemical Society |
| identifier.citation | Legind, C.H., Karlson, U., Burken, J.G., Reichenberg, F., and Mayer, P. (2007) "Determining chemical activity of (semi)volatile compounds by headspace solid phase microextraction" Analytical Chemistry, 79(7); 2869-2876. |
| identifier.pub.URI | |
| description.abstract | This research introduces a new analytical methodology for measuring chemical activity of nonpolar (semi)volatile organic compounds in different sample matrices using automated solid-phase microextraction (SPME). The chemical activity of an analyte is known to determine its equilibrium concentration in the SPME fiber coating. On this basis, SPME was utilized for the analytical determination of chemical activity, fugacity, and freely dissolved concentration using these steps: (1) a sample is brought into a vial, (2) the SPME fiber is introduced into the headspace and equilibrated with the sample, (3) the SPME fiber is injected into the GC for thermal desorption and analysis, and (4) the method is calibrated by SPME above partitioning standards in methanol. Model substances were BTEX, naphthalene, and alkanes, which were measured in a variety of sample types: liquid polydimethylsiloxane (PDMS), wood, soil, and nonaqueous phase liquid (NAPL). Variable sample types (i.e., matrices) had no influence on sampling kinetics because diffusion through the headspace was rate limiting for the overall sampling process. Sampling time was 30 min, and relative standard deviations were generally below 5% for homogeneous solutions and somewhat higher for soil and NAPL. This type of activity measurement is fast, reliable, almost solvent free, and applicable for mixed-media sampling. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Final version |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights.URI | |
| date.accessioned | 2007-04-11T17:00:48Z |
| date.available | 2007-12-17T20:43:13Z |
| identifier.persist.URI |