| Title |
A Study of the Effect of Acid Rain on the Behavior of Ions in Soil |
| Authors |
송승완 ; 최찬섭 ; 정형근 ; 권영식 ( Seung Wan Song ; Chan Sup Choi ; Hyung Keun Chung ; Young Sik Kwon ) |
| Abstract |
This study was carried out to investigate the pH, major anions (SO₄^(2-), NO₃^-,Cl^-), major cations (Ca^(2+), Na^+), ANC (acid neutralizing capacity), and the anions adsorption capacity of the soils collected from the hill at Yonsei campus and the mountain near Yonsei campus. The soil collected from the mountain near Yonsei campus had higher ANC and pH than those collected from the hill at Yonsei campus, indicating that the hill at Yonsei campus is more affected by acid rain or acid precipitation. It has shown that nitrate did not be adsorbed onto soil. The reason is that over the zero point of charge, the electric charge of the colloid in soil becomes minus, so there is no attractive force between soil and nitrate. Chloride and sulfate were adsorbed onto the soil significantly. However the adsorption capacities of these anions were changed in accordance with the hydrogen ion concentration, the amounts of exchangeable cations, and the amounts of leaching Al^(3+), Fe^(3+) in soil solution. As hydrogen ion concentration increases in soil solution, aluminum and ferric ions would be leached from the soil and replace Si(IV), Mn(IV) in the hydrate lattice. Therefore the electric charge of the colloid in soil becomes minus, which inhibits adsorption of chloride and sulfate. The competition of these conditions would affect the adsorption capacities of these anions. |