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KMID : 1024519980070040523
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Journal of the Environmental Sciences
1998 Volume.7 No. 4 p.523 ~ p.530
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A Study on the Comparison of Chemical Composition of Precipitation in the Northeast Asia
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Kim Sun-Tae
Yim Bong-Been
Tsujino T.
Maeda Y.
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Abstract
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Precipitation samples were collected at sixteen sites in Northeast Asia from June 1995 to February 1997, and were analysed for the anions , and and for the cartons $Na^+, NH_4^+, K^+, Mg^{2+} and in addition to pH and conductivity measurements. The quality assurance of chemical composition data was checked by considering the ion balance evaluating by 1 h 1 value and the conductilfty balance. The sum of cation concentrations were slightty greater than the sum of anion concentraions. For the anions, clearly dominates in most of sampling states whereas $Cl^-$ is more abundant in coast and rural sites In. Tapan. For the cations. and are generally the more abundant tons except when sources of Na+ exist. The contribution rate of nss-$SO_4^2-and NO_3^-$ to acidity are about 70% and 10-30%. respectively. The neutralizing capacity by a major neutralizing cations such as and nuts -. are above 98%(heavy polluted and urban sites in China), above 70%(urban sites in Japi,n and in Korea, coast sites In Chinas and above 60%(rural sites in Japan and in Korea), respectively.
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KEYWORD
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Acid rain, Precipitation chemistry, Ion concentraion
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