It has long been recognized that the major acids responsible for acid rain such as sulfuric acid and nitric acid, are formed in the troposphere through the oxidation of sulfur dioxide and the oxides of nitrogen (NO, NO₂) respectively, through a variety of chemical reaction pathways. This study was carried out to investigate the phenomena of acid precipitation at 1 point in Wonju area from Aug. 1991 to Jul. 1992.
The pH values, major anions(S0₄^(2-), NO₃^(-) and Cl^(-) and cations(Na^(＋), NH₄^(＋) Ca^(2＋), Mg^(2＋) and K^(＋)) were measured by pH meter and ion chromatography.
1. The pH of rainfall was in order of winter (4.58) fall (4.88) spring (5.51) summer (6.36). Acidic rainfall(less than pH 5.6) was appeared 49.1 percents.
2. The order of the major anion concentration in rainwater was SO₄²>C1 >NO₃and its acidity was more influenced by sulfate ion than others.
3. The sulfate, chloride and nitrate ion concentration in earlier rainwater ranged from 1.53 ppm to 52.35 ppm, 0.57 ppm to 33.91 ppm and 0.15 ppm to 8.64 ppm respectively.
4. During the period of yellow sand phenomena (Mar.-Apr.), the pH values were increased unexpectedly. The anions and cations concentration was increased and the order of these concentration was SO₄²>C1 >NO₃,Na^(＋), NH₄^(＋) Ca^(2＋), Mg^(2＋) and K^(＋).
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