Accession Number:

ADA459030

Title:

Characterization and Optimization of a High Surface Area-Solid Phase Microextraction Sampler for the Collection of Trace Level Volatile Organic Compounds in the Field

Descriptive Note:

Master's thesis

Corporate Author:

UNIFORMED SERVICES UNIV OF THE HEALTH SCIENCES BETHESDA MD F EDWARD HEBERT SCHOOL OF MEDICINE

Personal Author(s):

Report Date:

2006-01-01

Pagination or Media Count:

68.0

Abstract:

A prototype rapid, high volume air sampling device based on Solid Phase Microextraction SPME has been developed for the collection of trace level volatile organic compounds VOCs. The High Surface Area-Solid Phase Microextraction HSASPME device contains ten times more polymer than traditional SPME fibers and is uniquely designed to optimize compound uptake at higher flow rates. This study evaluated the extraction efficiency at six air sampling flow rates ranging from 0.1 Lmin to 10 Lmin and compared total compound extraction at the two extreme flow rates. A 10 ppbv concentration of 39 volatile organic compounds was used. CarboxenPolydimethylsiloxane and Polydimethylsiloxane polymer coatings were evaluated using an Agilent 6890N5973, a resistively heated Low Thermal Mass Gas Chromatograph column and an Entech 7100 Preconcentrator. Larger extraction efficiencies were observed at lower flow rates, but the higher flow rates proved superior in total compound extraction per unit time. Across the range of compounds, the HSASPME device achieved an average 8-fold increase in compound uptake at a flow rate of 10 Lmin as compared to 0.1 Lmin.

Subject Categories:

  • Organic Chemistry
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE