Masters Theses

Alternative Title

Time weighted average solid phase microextraction (TWA-SPME) for in-planta detection of chlorinated solvents


"Recent interest in the use of phyto-mapping for plume delineation at contaminated sites has promoted a need for new and innovative sampling techniques. Solid-phase micro-extraction (SPME) methods have been developed as a chemical analysis tool offering fast, simple, non-invasive sampling without the use of solvents. In this study SPME devices were tested for applicability for in-planta detection of chlorinated solvents. To evaluate the use of SPME for VOCs in-planta a number of integrated studies were undertaken. Uptake profiles were developed for nine chlorinated solvents in a liquid polydimethylsiloxane (PDMS) matrix with 100 µm Carboxene SPME fibers. Timeweighted average (TWA) sampling was conducted by exposing the SPME fiber to the chemical mixtures using three retraction lengths. Linear uptake profiles were demonstrated for 25 of the 27 of the sampling conditions. A storage experiment was conducted to determine sample retention on the SPME fiber for transport prior to analysis. It was demonstrated that all chemicals except dichloromethane are retained on the fiber for up to 24 hours. Field sampling with SPME devices was conducted at a known chlorinated solvent contaminated site using a newly designed in-planta sampler. Sampling with SPME fibers produced detections ranging from 5 to 234 times higher than tree core sampling"--Abstract, page iii.


Burken, Joel G. (Joel Gerard)

Committee Member(s)

Fitch, Mark W.
Ludlow, Douglas K.


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Environmental Engineering


United States. Environmental Protection Agency
National Science Foundation (U.S.)


Missouri University of Science and Technology

Publication Date

Spring 2009


ix, 67 pages


© 2009 Emily Moore Sheehan, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Extraction (Chemistry)
Organochlorine compounds -- Biodegradation
Solvents -- Biodegradation

Thesis Number

T 9494

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