The seasonal variation of pH and ion components in precipitation were investigated from January to December 2009 at Busan, Korea. The precipitation was acidic with a volume-weighted mean pH concentration of 5.32, which ranged from 3.79 to 8.66. The volume-weighted mean conductivity showed 86.77 μS/cm and indicated higher concentration about 96.69 μS/cm in summer. The volume-weighted mean equivalent concentration of components followed the order: K+ > Ca2+ > nss-Ca2+ > NH4 + > Mg2+ > Na+ > Li+ in cations and Cl- > SO4 2- > nss-SO4 2- > NO3 - > NO2- > F- > Br- in anions. Particularly, concentration of K+ and Cl- showed 56 and 78 % in cations and anions. The higher concentration in K+, Na+, Mg2+ and Cl- were shown in Busan city as compared to the other cities. The neutralization factors have been found to have higher value for potassium ion in winter compared with different seasons, indicating significant neutralization of acidic components over the region by potassium. Therefore, the precipitation characteristics at Busan had both continental and coastal as consequence of pH, conductivity and ionic analyses.

Abstract
 1. 서 론
 2. 자료 및 분석 방법
 3. 결과 및 고찰
  3.1. 신뢰성 검토
  3.2. pH와 전기전도도
  3.3. 이온성분
 4. 결 론
 참 고 문 헌

• 정운선(부경대학교 환경대기과학과) | Woon-Seon Jung (Department of Environmental Atmospheric Sciences, Pukyong National University)
• 이동인(부경대학교 환경대기과학과) | Dong-In Lee (Department of Environmental Atmospheric Sciences, Pukyong National University) Corresponding author
• 박성화(부경대학교 지구환경공학연협동과정) | Sung-Hwa Park (Interdisciplinary Program of Earth Environmental Engineering, Pukyong National University)
• 강덕두(부경대학교 지구환경공학연협동과정) | Deok-Du Kang (Interdisciplinary Program of Earth Environmental Engineering, Pukyong National University)
• 김동철(USRA) | Dongchul Kim (Universities Space Research Association)