茶畑施肥を起因とする地下水の硝酸汚染防止に向けた陰イオン交換樹脂を用いた土壌カラム試験による 硝酸イオンの吸着

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 SO42－ 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 SO42－ were detected in eluates when 185 mL of spring water from a catchment area of tea field was passed through a column.