익산지역 강수성분의 연차적 변이
Yearly Changes of Precipitation Component in the Iksan Area
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Abstract
This study was carried out to investigate yearly change in the precipitation component and the source strength to acid precipitation at Iksan area from 1997 to 2003.The average ratio of acid precipitation was 70.0% in 1997, 56.3% in 1998 and 36.4% in 2003. On the other hand, it ranged from 6.9 to 19.2% when precipitation was less from 1999 to 2002. The average annual wet depositions of major ionic components in precipitation were calculated by multiplying equivalent concentration by precipitation. The order of major anion components in precipitation was SO42- > Cl- > NO3-. On the other hand, the concentration of cation components were Ca2+ > Na+ > NH4+ > Mg2+ > K+ in order. The negative correlation was shown between pH and ionic components in precipitation except for Ca2+ and Na+. The correlation coefficient between pH and SO42- was highly significant as -0.508, which suggests that SO42- played important role in increasing the acidity of precipitation. Also the anions such as SO42- and NO3- were highly significant with cations such as Ca2+, Mg2+, K+, NH4+ and Na+. As a result, though pH was enable to use the acidity index of precipitation in somewhere, evaluating only pH in precipitation was insufficient as the index to establish corresponding strategy for acid rain.
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