Abstract：Rainwater samples were collected in the head region of Three Gorges Reservoir from June 2009 to July 2010 and the pH and major ion concentrations were measured. The rain in this region were seriously acidized, more than one third of the rain events’ pH were lower than 4.5. SO42- and NO3- were the main anions, and their volume-weighted mean were 161.90μeq/L and 65.24μeq/L, respectively, which account for 66% and 27% of the total measured anions. Ca2+ was the dominant cation in rainwater with a volume-weighted mean value 108.34μeq/L (8.89~932.90μeq/L). The seasonal variations of the pH show that the rainwater were more acidized in summer and autumn than those in winter and spring. Results of fractional acidity (FA) and neutralization factors (NF) indicated that the acidity of rainwater in winter and spring were neutralization caused by Ca2+. Studies of the origins of major ions showed that SO42- and NO3- were from fossil fuels, and Na+ and Cl- were from sea sources, while Ca2+ and Mg2+ from the terrestrial mineral particles.
吴起鑫, 韩贵琳. 三峡水库库首地区大气降水化学特征[J]. 中国环境科学, 2012, 32(3): 385-390.
WU Qi-Xin, HAN Gui-Lin. Chemical characteristics of rainwater collected in the head region of Three Gorges Reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(3): 385-390.