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KMID : 0385520160290010019
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Analytical Science & Technology
2016 Volume.29 No. 1 p.19 ~ p.28
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Ionic composition and pollution characteristics of precipitation in Jeju Island during 2009-2014
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Bu Jun-Oh
Song Jung-Min
Shin Su-Hyun
Kim Won-Hyung
Kang Chang-Hee
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Abstract
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The objective of this study was to determine the acidification of precipitation in the Jeju area. Precipitation samples were collected from the Jeju area from 2009-2014, and the major ionic species were analyzed. In the regression analysis, through a comparison of ion balance, electric conductivity, and acid fraction, the correlation coefficients showed a good linear relationship within the range of 0.927~0.983. The volumeweighted means of the pH and electric conductivity were 4.9 and 22.7 μS/cm, respectively. The ionic strength of precipitation was 0.27±0.38 mM, indicating about 35.9 % of total precipitation within the pure precipitation criteria. The volume-weighted mean concentrations (ieq/L) of the ionic species in the precipitation were in the order of Na+ > Cl? > nss-SO42? > NO3? > NH4+ > Mg2+ > H+ > nss-Ca2+ > PO43? > K+
> HCOO? > CH3COO?> NO2? > F? > HCO3? > CH3SO3?. The acidification contributions by sulfuric and nitric acids were 54.5 % and 36.5 %, respectively. Meanwhile the acidification contributions by formic and acetic acids were 4.8 % and
4.2 %, respectively. Thus, it was found that the acidification of the precipitation in the Jeju area was mainly
due to the inorganic acids. The neutralization factors by NH3 and CaCO3 were also 33 % and 20 %, respectively.
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KEYWORD
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precipitation, Jeju Island, acidification contribution, neutralization factor,
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