Abstract
A solid sorbent technique was developed to measure volatile halogenated organic compounds (VHOCs) in soil gas. The VHOCs were preconcentrated onto graphitized carbon black (Carbotrap) and analyzed by thermal desorption/high-resolution gas chromatography with electron-capture detection. The method detection limit (MDL) for trichloromethane (CHCl 3) and tetrachloromethane (CCl 4) in soil gas was approximately 1 μg m −3 for a 60-ml sample volume. A thermal-desorption temperature of 200°C was sufficient to recover more than 90% of the VHOCs from the sorbent. Breakthrough volumes for CHCl 3 and CCl 4 were at least 1000 ml when soil gas was drawn through the sample cartridge at a rate of 30 ml min −1. Sorbent cartridges stored at 20°C were sufficiently stable for at least 30 days. Application of the method in the field indicated that the measured concentration of VHOCs in soil-gas monitoring wells was sensitive to the volume of soil gas that was withdrawn.
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