Adsorption of Nitrate on Anion Exchange Resin in the Soil Column for Preventing Groundwater Contamination due to Nitrate with Application of Fertilizer and Manure on Tea Field

Abstract

To prevent groundwater pollution with NO₃^－ from fertilizer and manure used in tea field, we evaluated the performance of anion exchange resins A-D by examining whether they adsorb NO₃^－ in soil water from tea field using a soil column test. Anion exchange resin A, which gave the best results, was selected for the soil column test. Low concentrations of NO₃^－ and SO₄^2－ were detected in eluates when 185 mL of NO₃^－ aqueous solution was passed through a column packed with 30 g of soil from tea field and 10 g of anion exchange resin A. Similarly, low concentrations of NO₃^－ and SO₄^2－ were detected in eluates when 185 mL of spring water from a catchment area of tea field was passed through a column.