Title: User s Guide to the Collection and Analysis of Tree Cores to Assess the Distribution of Subsurface Volatile Organic Compounds 
Resource Type: document --> guidance / decision support 
Country: USA 
Year: 2008 
Availability: Scientific Investigations Report 2008–5088 
Author 1/Producer: U.S. Geological Survey (USGS) 
Author / Producer Type: Agency, regulator or other governmental or inter-governmental body 
Report / download web link (=direct link): http://pubs.usgs.gov/sir/2008/5088/pdf/sir2008-5088.pdf  
Format (e.g. PDF): PDF 
Size: (e.g. 20mb) 2.6 
EUGRIS Keyword(s): Contaminated land-->Site investigation-->Methods
Short description: Analysis of the volatile organic compound content of tree cores is an inexpensive, rapid, and simple approach to examining the distribution of subsurface volatile organic compound contaminants. The method has been shown to detect several volatile petroleum hydrocarbons and chlorinated aliphatic compounds associated with vapor intrusion and ground-water contamination. Tree cores, which are approximately 3 inches long, are obtained by using an increment borer. The cores are placed in vials and sealed. After a period of equilibration, the cores can be analyzed by headspace analysis gas chromatography. Because the roots are exposed to volatile organic compound contamination in the unsaturated zone or shallow ground water, the volatile organic compound concentrations in the tree cores are an indication of the presence of subsurface volatile organic compound contamination. Thus, tree coring can be used to detect and map subsurface volatile organic compound contamination. 
Submitted By: Professor Paul Bardos WhoDoesWhat?      Last update: 06/08/2008

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