Pv. Doskey et al., SOLID SORBENT METHOD FOR THE COLLECTION AND ANALYSIS OF VOLATILE HALOGENATED ORGANIC-COMPOUNDS IN SOIL-GAS, Journal of chromatography, 738(1), 1996, pp. 73-81
Citations number
14
Categorie Soggetti
Chemistry Analytical","Biochemical Research Methods
A solid sorbent technique was developed to measure volatile halogenate
d organic compounds (VHOCs) in soil gas. The VHOCs were preconcentrate
d onto graphitized carbon black (Carbotrap) and analyzed by thermal de
sorption/high-resolution gas chromatography with electron-capture dete
ction. The method detection limit (MDL) for trichloromethane (CHCl3) a
nd tetrachloromethane (CCl4) in soil gas was approximately 1 mu g m(-3
) for a 60-ml sample volume. A thermal-desorption temperature of 200 d
egrees C was sufficient to recover more than 90% of the VHOCs from the
sorbent. Breakthrough volumes for CHCl3 and CCl4 were at least 1000 m
l when soil gas was drawn through the sample cartridge at a rate of 30
ml min(-1). Sorbent cartridges stored at 20 degrees C were sufficient
ly stable for at least 30 days. Application of the method in the field
indicated that the measured concentration of VHOCs in soil-gas monito
ring wells was sensitive to the volume of soil gas that was withdrawn.