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Characteristics of Ionic Composition of Rainwater in Suwon  

Lee, Jong-Sik (National Institute of Agricultural Science and Technology, RDA)
Jung, Goo-Bok (National Institute of Agricultural Science and Technology, RDA)
Kim, Jin-Ho (National Institute of Agricultural Science and Technology, RDA)
Kim, Won-Il (National Institute of Agricultural Science and Technology, RDA)
Lee, Jeong-Taek (National Institute of Agricultural Science and Technology, RDA)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.40, no.2, 2007 , pp. 151-155 More about this Journal
Abstract
The issue of acid precipitation and related environmental problems in East Asia have been emerging. To evaluate the acidity and chemical characteristics of rainwater in Korea, its chemical properties during crop cultivation season from April to October were investigated at Suwon, Korea. Also, to estimate the contribution of ions on its acidity, ion composition characteristics and neutralization effects by cation ions were determined. Ion balance and electrical conductivity balance between the measured and estimated values showed high correlation. Rainwater had distributed highly in the range of pH 4.5~5.6. The pH of rainwater was relatively high at June as compared with other monitoring periods. $Na^+$ was the main cation followed by $NH_4{^+}$, $Ca^{2+}$, $H^+$ > $K^+$ > $Mg^{2+}$. Among these, $Na^+$, $NH_4{^+}$, $Ca^{2+}$ and $H^+$ covered over 93% of total cations. About 86% of anion in rainwater was composed of $SO{_4}^{2-}$ and $NO_3{^-}$. In rainwater samples, $NH_4{^+}$ and $Ca^{2+}$ contributed greatly to neutralization of the rain acidity. Also, 88% of soluble sulfate in rainwater was nss-$SO{_4}^{2-}$(non-sea salt sulfate).
Keywords
Rainwater; Suwon; Ion; Neutralization; Non-sea salt sulfate;
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