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The Impact of Clay Mineralogy on Nitrate Mobility under Unsaturated Flow Conditions

^a USDA-ARS Soil Drainage Research Unit, 590 Woody Hayes Dr., Rm. 234, Columbus, OH 43210
^b School of Natural Resources, Ohio State Univ., 2021 Coffey Rd., 210 Kottman Hall, Columbus, OH 43210
^c Biosystems and Agricultural Engineering Dep., Oklahoma State Univ., 109 Agricultural Hall, Stillwater, OK 74078

View larger version (25K): [in this window] [in a new window]   FIG. 1. Pore-scale conceptualization of anion adsorption and anion exclusion processes under unsaturated flow conditions.

View larger version (65K): [in this window] [in a new window]   FIG. 2. (a) Schematic of the computer-controlled syringe pump apparatus, (b) the computer-controlled syringe pump apparatus, (c) syringe pump and horizontal soil column with controller in background, and (d) syringes inserted into column inlet.

View larger version (30K): [in this window] [in a new window]   FIG. 3. Ideal transient unsaturated horizontal column water content and soil solution NO3––N concentration profiles for an initially dry soil with no NO3––N initially present.

View larger version (26K): [in this window] [in a new window]   FIG. 4. Experimental data profiles for (a) 100% sand, water content, (b) 100% sand, NO3–-N concentration, (c) 25% kaolinite, 75% sand, water content, (d) 25% kaolinite, 75% sand, NO3–-N concentration, (e) 25% illite, 75% sand, water content, (f) 25% illite, 75% sand, NO3–-N concentration, (g) 25% montmorillonite, 75% sand, water content, and (h) 25% montmorillonite, 75% sand, NO3–-N concentration.

View larger version (29K): [in this window] [in a new window]   FIG. 5. Experimental data profiles for (a) 15% kaolinite, 7.5% illite, 7.5% montmorillonite, 70% sand, water content, (b) 15% kaolinite, 7.5% illite, 7.5% montmorillonite, 70% sand, NO3––N concentration, (c) Slaughterville, water content, (d) Slaughterville, NO3––N concentration, (e) Teller, water content, and (f) Teller, NO3––N concentration. Organic matter was removed from the Slaughterville and Teller soils before testing.