Chemical character of precipitation and related particles and trace gases in the North and South of China |
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Authors: | Mingqun Huo Qian Sun Yuhua Bai Peng Xie Zhaorong Liu Jinlong Li Xuesong Wang Sihua Lu |
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Institution: | (1) College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, People’s Republic of China; |
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Abstract: | Rainwater samples were collected at four sites, including Beijing and Mazhuang Town in the north of China, Shenzhen and Mangdang
Mountain in the south of China. Character of atmospheric particles and gases were also measured at Mazhuang Town and Mangdang
Mountain. Both of Beijing and Shenzhen are urban sites; Mazhuang Town and Mangdang Mountain are rural and remote sites respectively.
The atmospheric pollution at rural plain site in the north of China was more serious than that at remote mountain site in
the south of China. At Beijing, Mazhuang Town, Shenzhen and Mangdang Mountain the average pH values in rainwater were 6.02,
5.97, 4.72 and 4.81, respectively and the concentrations of total ions in rainwater were 1454, 1125, 187 and 191 μeq/l, respectively.
While the acidity of the rain was higher in the south than that in the north, the rainwater in the north of China was more
severely polluted than that in the south. The major acidic ion in the rainwater is SO42-, and NH4+ is the most important neutralizing ion in rainwater at the four sites, followed by Ca2+. The amounts of organic acid in precipitation were compared with other sites in the world. The ratios of organic acid to
total free acid in rainwater at Mangdang Mountain was 13.8% and the influence of organic acid on acidity of rainwater at mountain
site in the south of China is more important. The variation of atmospheric particles, gases and components in rainwater and
cloud-fog water during special rain and cloud-fog events was discussed. The importance of washout process varied with atmospheric
species. The impacts of rainfall, rain duration time and wind speed on wash-out process were estimated by regression analysis. |
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