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최진수 ( Jin Soo Choi ),박진수 ( Jin Soo Park ),안준영 ( Joon Young Ahn ),오준 ( Jun Oh ),손정석 ( Jung Suk Son ),김현재 ( Hyun Jae Kim ),성민영 ( Min Young Sung ),이용환 ( Yong Hwan Lee ),이상덕 ( Sang Deok Lee ),홍유덕 ( You De 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.1
We looked into the characteristics and long term variations of chemicals affecting the acidity of precipitation. To this end, we analyzed the data collected at three acid deposition monitoring sites for the period from 1999 to 2013. Three monitoring sites include Seoul, Taean, and Jeju island. Required parameters such as pH, electric conductivity(EC), and concentrations of eight major ionic species were measured. In order to assure accuracy and precision of the data, values of measured electric conductivity were compared against values of calculated electric conductivity. Moreover, comparison between and was made in accordance with EANET°Øs QA/QC method to assure data reliability. During the monitoring period, the deposition was slightly acidic with pH value ranging between 4.6 and 4.9. Precipitation with pH 4.1 to 4.5 was most frequently observed with occurrence frequency of 27%. The analysis of seasonal variations of atmospheric concentration of pH showed that pH level was highest in spring season due to the influx of yellow sand and high pH levels in soils. The study also found that pH levels of samples collected at Seoul and Taean monitoring sites were lowest in autumn. On the other hand, pH level in Jeju was lowest in winter season. Increase in concentrations of NO3 - in precipitation was commonly observed at three monitoring sites. The concentrations of NO3- and NH4 + which affect the acidity of precipitation at Seoul and Taean monitoring sites showed increasing trend.