酸性비의 pH變化에 대한 影響因子 硏究 = A study on the factors of pH change in the acid rain

다국어 초록 (Multilingual Abstract)

The primary pollutants can be converted to acid aerosol or gases by complicated chemical mechanisms which would be scavenged from the atmosphere by the wet and dry deposition. This study is to investigate the factors of rain-water acidity thrugh the correlation between the major chemical components in precipitation process.
The results were as follows:
1. PH range of rain-water are 4.26- 6.90.
2. Correlation between [Ca^2+] and [NO_3^-], [Ca^2+] and [SO_4^2-], [Ca^2+] and [cb-ca] are 0.70, 0.86, 0.93, respectively.
3. Correlation between [Na^+] and [CI^-] is 0.83.
4. Correlation between [NH_4^+] and [CI^-], [NH_4^+] and [NO_3^-], [NH_4^+] and [SO_4^2-], [NH_4^+] and [cb-ca] are 0.73, 0.87, 0.71, respectively.
5. Correlation between [cb-ca] and [SO_4^2-] which is calculated from charge balance equation is 0.79. And it seems that [cb-ca] influenced to the pH change, initially [SO_2] absorbed in rain-water.
6. Concentration of [SO_4^2-] increases, by the gaseous reaction of SO_2 oxidation in the period of no-rain-days, and the aqueous reaction in the rain-water.
7. [SO_4^2-]/[NO_3^-]=5 in Chonju, the value of that was 1.32 in Seoul.
8. The factors of pH change are [SO_4^2-] and [cb-ca], especially at the condition of pH < 5.