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A Dynamic Two-Dimensional System for Measuring Volatile Organic Compound Volatilization and Movement in Soils

^a Département des Sols et de Génie Agroalimentaire, Faculté des Sciences de l'Agriculture et de l'Alimentation, Université Laval, Cité Universitaire, QC, Canada, G1K 7P4
^b George E. Brown Jr. Salinity Lab., USDA-ARS, 450 W. Big Springs Rd., Riverside, CA 92507-4617

View larger version (83K): [in a new window]   Fig. 1. Photo of the two-dimensional semi-automated dynamic chamber system and the soil column.

View larger version (16K): [in a new window]   Fig. 2. Propargyl bromide (3-bromo-1-propyne; 3BP) volatilization flux in each section of the bed and furrow system 50 to 210 h after its injection. (The vertical error bars indicate percent of variation from the average.)

View larger version (81K): [in a new window]   Fig. 3. Pressure distribution in half of the column at different times during and after irrigation.

View larger version (82K): [in a new window]   Fig. 4. The propargyl bromide (3-bromo-1-propyne; 3BP) (µg cm-3) distribution in the soil gas phase at different times after its injection in the center of the column.

View larger version (59K): [in a new window]   Fig. 5. Soil water content distribution (kg kg-1), propargyl bromide (3-bromo-1-propyne; 3BP), and Br- concentration distributions (mg kg-1 of dry soil) in the liquid phase at the end of the experiment.

View larger version (126K): [in a new window]   Fig. 6. Photos of water infiltrating into the soil at different times (the dark regions indicate wet soil).

View larger version (35K): [in a new window]   Fig. 7. Possible configurations of the system.