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Ill. A SIMPLE WAY TO CHECK THE EOUILIBRIUM CONCENTRATION OF <br />HYDROCARBONS V•SOLID-GAS INTERFACES <br />Fill the 1 liter PLEXIGLAS chamber with the Hydrocarbons contaminated <br />soils up to 1/4 of the height and cover the lid. (See Figure 8.) Put USI°s sensor <br />in the chamber and shake the soil slightly. Wait 2-3 minutes until it reach <br />equilibrium. The meter reading (ppm) is the concentration of hydrocarbons in <br />the contaminated soil, which is equivalent to Butane cont. in the air. If you <br />know the chemical which spills into the soil, you can use the conversion <br />factor (Table 1) to get the true cont. of that chemical. <br />TABLE 1. TECHNICAL DATA FOR• DIESEL <br />/ SOLVENT VAPORSDETECTOR <br />MODEL 6200D <br />Acetone <br />Benzene <br />a Butane <br />Cyclohexane <br />Carbon Monoxide <br />Formaldehyde <br />d Methane <br />Propane <br />Perchloroethylene <br />Toluene <br />Xylene <br />Methyl Ethyl Ketone (M.E.K.) <br />C Diesel Vapor <br />c Gasoline Vapor <br />d Steam, Moisture <br />CONVERSION FACTOR (C.F.)b <br />1.05 <br />0.60 <br />1.30 <br />1.00 <br />1.29 <br />0.002 <br />0.11 <br />0.001 <br />0.33 <br />0.05 <br />0.95 <br />0.72 <br />0.41 <br />0.40- <br />1.40 <br />0.001 <br />(a) This hydrocarbons detector is calibrated by using Butane as the reference <br />gas. <br />(b) The ppm cont. shown on the meter divided by the conversion factor of the gas <br />to be determined is the true gas/vapors conc. <br />(c) Approximate conversion factor figure for gasoline & diesel vapors. <br />(d) This hydrocarbons detector has almost no interference effect by methane and <br />moisture. <br />101 <br />