Abstract
Alcohols, glycols, and their aqueous mixtures were screened as absorption liquids for a wet effluent diffusion denuder (WEDD) for preconcentration of gas-phase organic compounds from air. 1-Propanol proved suitable for the preconcentration of 1,4-dichlorobenzene (1,4-DCB), which was chosen as a model substance. The dependences of collection efficiency of the WEDD on flow rates of absorption liquid and air were measured. Under sufficiently high flow rates of absorption liquid (>150 μL min -1 ), the experimental collection efficiencies agreed with theoretical values for air flow rates from 0.5 to 4.3 L min -1 at adjusted 1,4-DCB concentrations of 48 and 720 μg m -3 . The denuder operated without any difficulties for temperatures from 18 to 33 °C and relative air humidities of 10-100%.
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