Polycyclic aromatic hydrocarbons (PAH) are important environmental pollutants generally formed during incomplete combustion of organic matter containing carbon and hydrogen. Introduced into the human body by adsorption through the skin, ingestion or inhalation, the biotransformation processes of PAH lead to the formation of multiple metabolites. Due to the short elimination lifetime from the body, the quantitative determination of monohydroxy-PAH (OH-PAH) in urine samples provides accurate information on recent exposure to environmental PAH. Urine analysis of OH-PAH with established methodology relies on sample clean-up and pre-concentration followed by chromatographic separation and quantification. Although chromatographic techniques provide reliable results in the analysis of OH-PAH, their experimental procedures are time consuming and expensive. Additional problems arise when laboratory procedures are scaled up to handle thousands of samples under mass screening conditions. Under the prospective of a sustainable environment, the large usage of organic solvents is one of the main limitations of current chromatographic methodology. It is within this context that new analytical approaches based on easy-to-use and cost-effective methodology become extremely relevant. This dissertation focuses on the development of screening methodology for the routine analysis of PAH metabolites in numerous samples. It explores the room-temperature fluorescence properties of six metabolites originating from parent PAH included in the Environmental Protection Agency priority pollutants list. 1- hydroxyfluorene, 1-hydroxypyrene, 6-hydroxychrysene, 9-hydroxyphenanthrene, 3- hydroxybenzo[a]pyrene and 4-hydroxybenzo[a]pyrene are used as model biomarkers to investigate the analytical potential of new methods based on solid-phase extraction (SPE) and iii room-temperature fluorescence (RTF) spectroscopy. Quantitative determination of metabolites is carried out either in the eluent extract[1, 2] or on the surface of extraction membranes[3, 4] . The direct determination – i.e., no chromatographic separation - of the six metabolites is based on the collection of excitation-emission matrices and synchronous fluorescence spectra.
| Identifer | oai:union.ndltd.org:ucf.edu/oai:stars.library.ucf.edu:etd-3879 |
| Date | 01 January 2013 |
| Creators | Calimag, Korina Jesusa |
| Publisher | STARS |
| Source Sets | University of Central Florida |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Electronic Theses and Dissertations |
Page generated in 0.0021 seconds