Title: Field testing using a tracer gas method to measure contamination between dry cleaner and associated apartments. 
Resource Type: document --> technical publication --> report 
Country: Denmark 
Language(s): Danish
English
 
Year: 2003 
Availability: Environmental project, Miljørapport nr. 816 
Author 1/Producer: Mortensen, P. 
Other Authors/Producers: Glensvig, D. 
Author / Producer Type: Agency, regulator or other governmental or inter-governmental body 
Publisher: The Danish Environmental Protection Agency, Miljøstyrelsen 
Publisher City: Strandgade 29, DK-1405 Copenhagen K, Denmark 
ISBN: ISBN 87-7972-689-5 
Report / download web link (=direct link): http://www2.mst.dk/common/Udgivramme/Frame.asp?pg=http://www ...  
Format (e.g. PDF): PDF 
Size: (e.g. 20mb) 934 
EUGRIS Keyword(s): Contaminated land-->Site investigation-->Methods
Contaminated land-->Site investigation-->Sampling and analysis
Contaminated land-->Site investigation-->Sampling strategy
 
Short description: In this project, a method is developed using a diffusive tracer gas to measure compound transfer and air movement between adjacent rooms and floors in a building. The method is developed to assess impacts from dry-cleaning establishments and is tested under realistic field conditions. 
Long description: The diffusion velocity of tracer gasses and chlorinated solvents through an intact concrete slab was determined by laboratory experiments. The diffusive velocity of decane was 30% slower than for two tracer gasses which in turn were 50% slower than tetrachloroethylene. Up to 30% of the tracer gas and tetrachloroethylene, and 60% of decane was retained in the concrete slab. The field tests indicated that the diffusive transport was insignificant compared to the total flux between rooms and floors. A total of 55 double determinations were carried out during the test period and the relative standard deviation for double determinations of sampling and analysis was 8%. Uncertainty of the calculated flux is estimated at 25%. Variations of 3 - 5 times were noted for measurements carried out at 14-day intervals in the same location. This is presumably due to outdoor climatic conditions that influence air movements in the building. The method allows direct measurement and calculation of the actual transfer of contamination between a dry-cleaning establishment and an apartment one floor above. The extent of this contribution to the room air concentration of chlorinated solvents is inversely proportional with the actual air change in the apartment. 
Submitted By: Dr Jacqueline Falkenberg WhoDoesWhat?      Last update: 02/04/2007