Assessment of nitrate transport parameters using the advection-diffusion cell

摘要: This study aimed to better understand nitrate transport in the soil system a part of state North Rhine-Westphalia, Germany, and aid development groundwater protection plans. An advection-diffusion (AD) cell was used miscible displacement experiment setup characterize 12 different samples from area. The three sorption isotherms were tested define exact interaction with matrix. Soils varied their properties which its turn explain variations rates. Soil texture organic matter content showed have most important effect on recovery retardation. indicated decrease retardation by increasing sand fraction, an increase content. high fractions (up 94 %) exhibited low capacity less than 10 %, while soils higher about 30 %. Based parameterization for equation, pore water velocity both sandy loamy significantly (P < 0.001). Pore (about 4 × 10-3 m/s) 100 1000 larger (8.7 × 10-5 m/s). On other hand, reduction associated due fine pathways clogged colloids. It is expected that existing micro-phobicity increased 9 32 % resulting maximum diffusion rates 3.5 × 10-5 m/s2 (sample number CS-04) 1.4 × 10-7 m/s2 silt loam FS-02).