Abstract
To investigate the characteristics of rainwater in Daegu area, parameters such as pH, electrical conductivity, TOC, TIC and TC were analyzed on 34 samples from January to December 2005. Results revealed that higher values were measured in winter than in summer. Furthermore samples that originated from industrial and commercial areas had higher chemical concentrations and conductivity as compared with those from residential and reference areas. Seldom acid-rain occurrence was recorded(27.2%) as compared with non-acid precipitation(72.8%) incidence. Also higher organic carbon fraction(TOC) was detected(72.5%) than inorganic form(TIC)(27.5%) in terms of component ratio with TC. During frequent rainfalls, the concentration of chemicals was decreased to a degree. Conversely, lower rate of rainfall gave out higher chemical values. Thereby the improvement of air qualify in 2005 compare with 2003 report was influenced by the environment authorities' efforts to reduce air pollutions and various factors by the depression of the region's economy.
대구지역에 내린 빗물의 수질 특성을 조사하기 위해 2005년 1월부터 12월까지 채취한 빗물시료 34개에 대하여 pH, 전기전도도 TOC, TIC TC와 같은 화학성분을 분석하였다. 분석된 화학성분의 농도는 겨울철이 여름철보다 높게 나타났다. 공업지역과 상업지역은 주거지역과 대조지역보다 화학성분의 농도와 전기전도도가 높게 나타났다. 산성우의 발생빈도(27.2%)가 비산성우(72.8%)에 비해 훨씬 낮았고, 또한 TC의 구성비율은 유기성인 TOC(72.5%)가 무기성인 TIC(27.5%)보다 높게 나타났다. 강수가 잦을수록 화학성분의 농도는 어느 정도 낮아지고, 반대로 무강수일이 길수록 화학성분의 농도가 높아졌다. 2003년에 비해 2005년의 대기질이 다소 개선된 원인은 환경행정당국의 대기오염 저감노력과 함께 지역 경기침체로 인한 다양한 영향을 받는데 있었다.