Evalution of Acid Deposition in Korea

This study was carried out to evaluate acid depositions and to understand their effect. Wet precipitation has been collected at twenty-four sites in Korea for one year of 1999. The ion concentrations such as H+, Na+, K+, Mg2+, NH4 +, Ca2+, Cl−, NO3 − and SO4 2− were chemically analyzed and determined. Precipitation had wide range of pH(3.5∼8.5), and volume-weighted average was 5.2. The contribution amounts of Cl−, SO4 2− and NO3 − in anion were shown to be 54%, 32%, and 14%, respectively and those of Na+ and NH4 + in cation were 32% and 25%. The ratios of Cl− and Mg2+ to Na+ in precipitation were similar to those of seawater, which imply that great amount of Cl− and Mg2+ in precipitation could be originated from seawater. The concentration of H+ is little related with SO4 2−, NO3 − and Cl− ions, whereas nss−SO4 2− and NO3 − are highly correlated with NH4 +, which could suggest that great amount of SO4 2− and NO3 − exist in the form of ammonium associated salt. The annual wet deposition amounts (g m−2year−1) of SO4 2−, NO3 −, Cl−, H+, NH4 +, Na+, K+, Ca2+ and Mg2+ were estimated as 0.88∼4.89, 0.49∼4.37, 0.30∼9.80, 0.001∼0.031, 0.06∼2.15, 0.27∼4.27, 0.10∼3.81, 0.23∼1.59 and 0.03∼0.63.