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Environ Sci Technol

Title:		VOCs fate and partitioning in vegetation: use of tree cores in groundwater analysis
Author(s):		Ma X; Burken JG;
Address:		"Department of Civil Engineering, University of Missouri-Rolla, 65409, USA"
Journal Title:		Environ Sci Technol
Year:		2002
Volume:		36
Issue:		21
Page Number:		4663 - 4668
DOI:		10.1021/es025795j
ISSN/ISBN:		0013-936X (Print) 0013-936X (Linking)
Abstract:		"Analysis of tree cores collected from contaminated sites has shown that concentrations of VOCs in cores are related to groundwater concentrations. However, initial research was highly qualitative. To better understand the relationship of groundwater VOC concentrations to measured VOCs in tree cores, detailed understanding of contaminant behavior in vegetation is required. Work presented here investigates the interaction, with focus on the chlorinated solvents trichloroethylene, 1,1,2,2-tetrachloroethane, and carbon tetrachloride. The sorption and desorption partitioning of these compounds between air and woody biomass were investigated. Partitioning coefficients were determined for cores of trunks of large trees and smaller stem cuttings. The internal partitioning of these compounds between the transpiration stream and the woody biomass within the tree was also determined for cores. The partitioning coefficients of the compounds between air, water, and biomass of tree cores and trunks were related to the physicochemical characteristics of contaminants, mainly the Henry's law constant and vapor pressure. These partitioning coefficients relate the contaminants' concentration in the bulk solution and analyzed headspace of vials and therefore can be utilized to quantify the fate of contaminants in natural settings and in phytoremediation systems. Tissue analysis and determination of partitioning coefficients may provide an effective way to estimate the concentration of compounds in the transpiration stream and in the soil or groundwater in a noninvasive, extremely rapid, and cost-effective manner"
Keywords:		Adsorption Biomass Organic Chemicals/analysis Plant Roots Soil Pollutants/*pharmacokinetics *Trees Volatilization Water Pollutants/*pharmacokinetics;
Notes:		"MedlineMa, Xingmao Burken, Joel G eng Research Support, U.S. Gov't, Non-P.H.S. 2002/11/16 Environ Sci Technol. 2002 Nov 1; 36(21):4663-8. doi: 10.1021/es025795j"