한국농림기상학회지, 제 9권 제1호(2007) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 9, No. 1, (2007), pp. 49~54
DOI: 10.5532/KJAFM.2007.9.1.049
ⓒ Author(s) 2014. CC Attribution 3.0 License.


태안지역 강우의 이온 조성

이종식(1), 김건엽(1), 이정택(1), 이관용(2), 박병용(2)
(1)농업과학기술원 환경생태과, (2)태안군농업기술센터

(2007년 01월 30일 접수; 2007년 02월 23일 수락)

Characteristics of Ionic Composition of Rainwater in Taean

Jong-Sik Lee(1), Gun-Yeob Kim(1), Jeong-Taek Lee(1), Kwan-Yong Lee(2),, Byoung-Yong Park(2)
(1)National Institute of Agricultural Science and Technology, RDA, Suwon 441-707, Korea
(2)Taean-gun Agricultural Development & Technology Center, Taean 357-903, Korea

(Received January 30, 2007; Accepted February 23, 2007)

ABSTRACT
The issue of acid precipitation and related environmental problems in East Asia has been emerging. To evaluate the acidity and chemical characteristics of rainwater in Korea, its chemical properties during cultivation season from April to October in 2005 were investigated at Taean. Also, to estimate the contribution of ions on acidity, ion composition characteristics and neutralization effects by cations were determined. The electrical conductivity balance between measured and estimated values showed a high correlation. Rainwater was highly distributed in the range of pH 4.5~5.0. The acidity of rainwater was relatively low during the month of June compared with other monitored periods. Na+ was the main cation, followed by H+>Ca2+>NH4+>K+>Mg2+. Among these ions, Na+, NH4+, Ca2+ and H+ comprised over 94% of the total cations. Rainwater anion composition was more than 80% with SO42- and NO3-. In rainwater samples, NH4+ and Ca2+ contributed greatly to neutralizing the rain acidity. The sulfate content decreased until September, and sea salt derivatives were higher in May and October than during other monitored periods. Also, 78% of the soluble sulfate in rainwater was nss-SO42- (non-sea salt sulfate).

Keyword: Rainwater, Taean, Ion, Neutralization, Non-sea salt sulfate

MAIN

적요

태안지역에서 영농기간중 강우의 화학적 특성을 알아보기 위하여 2005년 4월부터 10월까지 26점의 강우를 채수하여 pH 및 화학적 성분조성을 조사하였다. 강우량을 고려한 가중평균(volume-weighted mean)이온농도 변화와 알카리성 물질들에 의한 강우의 산성도 중화를 평가한 결과는 다음과 같다.
시료분석의 신뢰성을 검토한 전기전도도 수지 평가에서는 높은 상관을 나타내어 분석 이온들에 대한 신뢰가 인정되었다. 조사기간 중 태안지역에 내린 강우의 pH별 분포는 pH 4.5~5.0 범위가 가장 많았으며, 월별로는 6월이 다른 조사기간에 비해 산성도가 낮았다. 강우량과 강우의 EC 관계에서는 강우기가 비강우기인 6월 이전에 비해 EC가 낮은 계절적 특성을 보였다. 강우의 조성에서 양이온 구성은 Na+> H+>Ca2+>NH4+>K+>Mg2+의 순이었으며, Na+, NH4+, Ca2+ 및 H+가 전체 양이온 함량의 94% 이상을 차지하였다. 음이온은 SO42->NO3->Cl- 순으로 SO42- 및 NO3-가 약 80%를 차지하였다. 조사기간 중 강우산성도 중화는 6월이 다른 기간에 비해 높았음을 보였다. 총 sulfate 함량 중 nss-SO42- 함량은 78%로 강우 중에 함유된 sulfate의 대부분이 인위적인 발생원에서 기인되었으며, 월별로는 9월까지 점차 낮아지다 10월에 다시 높아지는 계절적 변이를 보였다.

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