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Laboratory-Scale Measurement of Trace Gas Fluxes from Landfarm Soils

^a Biogeochemistry Department, Max Planck Institute for Chemistry, P.O. Box 3060, D-55020 Mainz, Germany, Formerly with the Dep. of Land Resource Science, University of Guelph
^b Dep. of Land Resource Science, University of Guelph, Guelph, ON, Canada N1G 2W1
^c School of Engineering, University of Guelph, Guelph, ON, Canada N1G 2W1

View larger version (31K): [in a new window]   Fig. 1. Schematic of integrated mesocosm scale facility designed and constructed to measure multiple trace gas emissions from landfarm soils. Inset shows design of individual simulator. MAC, MacDowell Lake diesel fuel–contaminated soil landfarm; RL, refinery landfarm; DSL, Delhi sandy loam (uncontaminated control); THD, total hydrocarbon detector; DAQ, data acquisition and control system.

View larger version (38K): [in a new window]   Fig. 2. Ideal and actual analyzer response upon switching of solenoid between simulators and source air.

View larger version (17K): [in a new window]   Fig. 3. Effect of simultaneous water vapor flux on fluxes of total hydrocarbons (THC) and CO2. Corrections calculated with Eq. [5]. MAC, MacDowell Lake diesel fuel–contaminated soil landfarm; RL, refinery landfarm; DSL, Delhi sandy loam (uncontaminated control).

View larger version (34K): [in a new window]   Fig. 4. Continuous time series of results from simulated cultivation experiments. Solid arrows indicate times when cultivation was performed. Note different scales on vertical axes. MAC, MacDowell Lake diesel fuel–contaminated soil landfarm; RL, refinery landfarm; DSL, Delhi sandy loam (uncontaminated control).

View larger version (37K): [in a new window]   Fig. 5. Continuous time series of results from simulated rainfall experiments. Dashed arrows indicate times when water was added to soil with a watering can. Solid arrows indicate times when cultivation was performed. Note different scales on vertical axes. MAC, MacDowell Lake diesel fuel–contaminated soil landfarm; RL, refinery landfarm; DSL, Delhi sandy loam (uncontaminated control).

View larger version (26K): [in a new window]   Fig. 6. Effect of moisture content on measured trace gas fluxes. Moisture content converted to water-filled porosity (WFP). (a) Total hydrocarbons (THC), (b) CO2. Note different scales on axes. MAC, MacDowell Lake diesel fuel–contaminated soil landfarm; RL, refinery landfarm; DSL, Delhi sandy loam (uncontaminated control).