A preliminary study on the chemical compositions of forty seven precipitations from March 1994 to May 1995 in Yeoncheon-gun, which is adjacent to the southern boundary of demilitarized zone (DMZ) in the northernmost tip of Kyunggi province has been performed. The metal cation and anion concentrations were measured by atomic absorption spectrometer and ion chromatography, respectively. pH/Ion meter and direct nesslerization method were used for the concentration measurements of H- ion and NH_4+ ions, respectively. Based on the data, the quantitative orders of the cation and anion average concentrations were Ca2+ > NH_4+ > Na+ > K+ > Mg2+ > H+ and SO_42- > Cl- > NO_3-, respectively. The ratio of average total anion concentration to average total cation concentration was 0.97. The average pH value of the precipitations was 5.60. These results, correlation coefficients between the ion concentrations, and monthly variations of pH value and precipitation amount are used for chemical analysis on the environmental pollution and pollutant sources in Yeoncheon-gun of Kyunggi province near DMZ.

• 박국태(한국교원대학교 화학교육과) | Kuk-Tae Park (Dept. of Chemical Education, Korea National University of Education)
• 김창호(한국교원대학교 화학교육과) | Chang-Ho Kim (Dept. of Chemical Education, Korea National University of Education)
• 홍현복(한국교원대학교 화학교육과) | Hyun-Bok Hong (Dept. of Chemical Education, Korea National University of Education)
• 류오현(한국교원대학교 화학교육과) | Oh-Hyeon Ryu (Dept. of Chemical Education, Korea National University of Education)
• 양일호(한국교원대학교 화학교육과) | II-Ho Yang (Dept. of Chemical Education, Korea National University of Education)
• 임광수(한국교원대학교 화학교육과) | Kwang-Su Lim (Dept. of Chemical Education, Korea National University of Education)
• 민덕식(한국교원대학교 화학교육과) | Duck-Sik Min (Dept. of Chemical Education, Korea National University of Education)