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Passive Flux Meter Measurement of Water and Nutrient Flux in Saturated Porous Media: Bench-Scale Laboratory Tests

^a Dep. of Environmental Engineering Sciences, Univ. of Florida, Gainesville, FL 32611
^b Soil and Water Science Dep., Univ. of Florida, Gainesville, FL 32611
^c Dep. of Civil and Coastal Engineering, Univ. of Florida, Gainesville, FL 32611

View larger version (28K): [in this window] [in a new window]   Fig. 1. Schematic diagram for bench-scale flow chamber (plan view) to evaluate performance of the passive nutrient flux meter (PNFM) (shown vertically in center) including tracer elution and PO43– accumulation in the PNFM (horizontal section shown). Note that tracers are represented as straight-chain molecules with varying lengths; PO43– is represented with spheres.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Adsorption isotherm of PO43– on Lewatit S 6328A resin with a Freundlich model fit.

View larger version (27K): [in this window] [in a new window]   Fig. 3. (A) Resident alcohol tracer elution curves along with cumulative water pore volume and (B) an example plot for retardation factor determination using four piece-wise linear segments from the nonlinear 1-hexanol elution curve. 2,4-dimethyl-3-pentanol (2,4-DMP); 2-ethyl-1-hexanol (2E1H).

View larger version (18K): [in this window] [in a new window]   Fig. 4. Log-log relationship between retardation factor (Rd) and aqueous solubility for resident alcohol tracers. 2,4-dimethyl-3-pentanol (2,4-DMP).

View larger version (16K): [in this window] [in a new window]   Fig. 5. Comparison between Darcy flux, q, estimated from the passive nutrient flux meter (PNFM) using the 1-hexanol and 2,4-dimethyl-3-pentanol (2,4-DMP) tracers and the actual applied values.

View larger version (16K): [in this window] [in a new window]   Fig. 6. Comparison between passive nutrient flux meter (PNFM)-estimated and applied PO43– fluxes. Mean estimated values are shown with standard deviation (n = 4).