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Environ Sci Technol

Title:		Fractionation of stable isotope-labeled organic pollutants as a potential tracer of atmospheric transport processes
Author(s):		Dickhut RM; Padma TV; Cincinelli A;
Address:		"School of Marine Science, College of William and Mary, Gloucester Point, Virginia 23062, USA. rdickhut@vims.edu"
Journal Title:		Environ Sci Technol
Year:		2004
Volume:		38
Issue:		14
Page Number:		3871 - 3876
DOI:		10.1021/es034282p
ISSN/ISBN:		0013-936X (Print) 0013-936X (Linking)
Abstract:		"To test the potential for using stable isotope fractionation to examine the atmospheric transport of semivolatile organic compounds (SOCs), we conducted simplified distillation experiments in the laboratory and a tracer-release experiment using mixtures of stable isotope-labeled (D and 13C) and unlabeled SOCs. Perdeuterated phenanthrene and alpha-hexachlorocyclohexane were transported more slowly via air-water gas exchange in our laboratory experiments, resulting in significant isotope fractionation of perdeuterated/unlabeled compound mixtures. In contrast, isotope fractionation of 13C6-labeled SOCs was much lower. A field tracer-release study was then conducted by spiking a seawater retention pond with a mixture of D10-labeled, 13C2-labeled, and unlabeled phenanthrene and examining isotope fractionation of the mixture after air-water gas exchange. No preferential fractionation of D10-vs 13C2-labeled phenanthrene was observed in the pond water; however, greater fractionation of D10-vs 13C2-labeled phenanthrene was observed in air samples collected within a 1-100 m radius of the pond. Thus, stable isotope tracers may provide a means of examining the atmospheric transport and air-earth exchange rates of POPs in an environmental realistic setting"
Keywords:		*Air Movements Carbon Isotopes Chemical Fractionation Deuterium *Environmental Monitoring Environmental Pollutants/*analysis Isotope Labeling Organic Chemicals/*analysis Volatilization;
Notes:		"MedlineDickhut, Rebecca M Padma, Tirupponithura V Cincinelli, Alessandra eng Research Support, U.S. Gov't, Non-P.H.S. 2004/08/10 Environ Sci Technol. 2004 Jul 15; 38(14):3871-6. doi: 10.1021/es034282p"