Accession Number : ADA476011


Title :   Influence of Geometry on a High Surface Area-Solid Phase Microextraction Sampler for Chemical Vapor Collection


Descriptive Note : Master's thesis


Corporate Author : UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD DEPT OF PREVENTIVE MEDICINE AND BIOMETRICS


Personal Author(s) : Wheeler, Robbie L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a476011.pdf


Report Date : 04 Jun 2007


Pagination or Media Count : 76


Abstract : The High Surface Area Solid Phase Microextraction HSA-SPME device is an internally heated sampling device designed for high-volume, trace level air sampling. This study compared the analyte extraction and durability of five different HSA-SPME geometric configurations at two sample flow rates. Each HSA-SPME configuration was tested for its ability to extract a 10 ppbv 39-component gas mixture and thermally desorb into an analytical instrument. Differences in analyte recovery between the five HSA-SPME geometries were not significant. The lower sample flow rate (0.1 Lpm) yielded higher analyte recoveries compared to the higher flow rate of 4 Lpm (P 0.001) given a fixed volume of air sampled. However, the higher flow rate exhibited 30-fold higher extraction efficiency in terms of mass per unit time, which is more beneficial for instrumentation and decision making when sampling speed is of the essence. Although some physical degradation occurred, the devices' ability to collect analytes did not appreciably decline after 100 desorption cycles.


Descriptors :   *CHEMICAL VAPOR DEPOSITION , *EXTRACTION , METHODOLOGY , DEGRADATION , PHYSICAL PROPERTIES , CONFIGURATIONS , INSTRUMENTATION , SAMPLING , FLOW RATE , THESES , PROTOTYPES


Subject Categories : Industrial Chemistry and Chemical Processing
      Chemical, Biological and Radiological Warfare


Distribution Statement : APPROVED FOR PUBLIC RELEASE