Nitrate adsorption and retardation in an Andisols with different soil pH and different coexisting anions

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  • 土壌pHおよび共存陰イオンが異なる黒ボク土における硝酸イオンの吸着と移動遅延
  • ドジョウ pH オヨビ キョウソン インイオン ガ コトナル クロボクド ニ オケル ショウサン イオン ノ キュウチャク ト イドウ チエン

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Abstract

The mechanisms of nitrate (NO_3^-) adsorption and retardation in Andisols are vital to understanding how NO_3^- derived from fertilizers contaminates the groundwater in areas with a volcanic ash soil. In this study, we quantified the relationship between NO_3^- adsorption and retardation in an Andisol under different conditions of pH and coexisting anions. The soil pH was adjusted to 4 or 5 by adding 0.01N HCl or H_2SO_4 solutions. We measured the NO_3^- adsorption on these pH-adjusted soils in batch tests at a soil-to-solution ratio of 1:10, and measured NO_3^- retardation by means of column-flow tests. The NO_3^- adsorption isotherms in the batch tests were described by the Freundlich equation at solution NO_3^- concentrations ranging from I to 10mmol L^<-1>. Nitrate adsorption and retardation were both smaller for H_2SO_4-treated soils than for HCl-treated soils, and decreased at higher soil pH due to the soil's low anion exchange capacity. The retardation factors determined by the column tests were strongly associated with the NO_3^- adsorption measured in the batch tests (r^2=0.99). Furthermore, we could predict the NO_3^- retardation factor from the NO_3^- adsorption in the batch tests through the adsorption-retardation theory. Our results suggest that batch tests for NO_3^- adsorption are a useful tool for inferring NO_3^- retardation in Andisols.

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