한국농림기상학회지, 제 5권 제1호(2003) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 5, No. 1, (2003), pp. 1~5
ⓒ Author(s) 2014. CC Attribution 3.0 License.


수원지역 영농기 강우의 강우량 가중평균 이온농도

이종식, 김진호, 정구복, 엄기철
농엽과학기술원 환경생태과

(2003년 01월 04일 접수; 2003년 02월 13일 수락)

Volume-Weighted ion Concentration of Rainwater in Suwon Area
During Farming Season

Jong-Sik Lee, Jin-Ho Kim, Goo-Bok Jung, Ki-Cheol Eom
National Institute of Agricultural Science and Technology, RDA, Suwon 441-707, Korea

(Received January 04, 2003; Accepted February 13, 2003)

ABSTRACT
This study was carried out to investigate the chemical properties of rainwater in the Suwon area. Rainwater was collected from April to October in 1999 and 2000, and its chemical composition was analyzed. The pH of rainwater in April was higher than that of the months after June. Occurrence frequency of rain above pH 5.6 was 45.1%, which showed the highest ratio from rainwater samples during the investigation periods. Those of pH 5.0∼5.6 and 4.5∼4.9 range were 31.4 and 19.6%, respectively. The major cations in rainwater were Ca2+ and NH4+, and SO42- made up more than 50% of total anion composition. Monthly variation of neutralization capacity of rainwater acidity by Ca2+ and NH4+ decreased during the rainy season. The ratio of non-sea salt sulfate to nitrate (nss-SO42-/NO3- ) was 2.1, which means anthropogenic SO42- contributed to acidity of rainwater two times more than NO3-.

Keyword: rainwater, acidity, chemical composition, nss-4 (non-sea salt sulfate)

MAIN

적요

수원 지역의 영농기간중 강우의 화학적 특성을 알아보기 위하여 1999년 및 2000년 2년간 4월부터 10월까지 각각 7개월 동안 수원지역에 내린 빗물의 화학적 성분조성과 강우량을 고려한 가중평균 (volume-weighted mean) 이온농도 변화를 조사한 결과는 다음과 같다.
조사 기간중 강우 pH는 편서풍의 영호을 받는 기간인 4월이 6월 이후의 강우에 비해 높게 나타나 계절적 특성을 보였다. 강우시료에 대한 pH별 강우 분포는 pH 5.6 이상이 45.1% 로 가장 많았으며 , pH 5.6~5.0 및 4.5~4.9 범위의 강우가 각각 31.4% 와 19.6%를 차지하였다. 빗물의 조성은 SO4가 음이온의 50% 이상을 차지하였고 전체 양이온 함량의 약 65% 가 NH4+ 와 Ca2+로 구성되어 있다. 월별 빗물 pH는 측정치 (pHobs.)는 6월에서 9월 사이에 낮은 반면, 이론치(pHthe.)는 같은 기간에 증가하여 대기중의 알카리성 물질들에 의한 중화력이 다른 기간에 비해 낮았다. 또한, 강우중 비해염 sulfate는 총 sulfate 함량의 약 93.6%이었다. 강우의 산성도 기여율 (nss-SO42−/NO3-) 은 평균 2.1 로 비해염 SO42− 에 의한 기여율이 NO3- 보다 약 2배 가량 높았다.

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