| Chemical composition of wet precipitation at a developing urban site in southeastern China |
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| 作者姓名： | Miaoyun ZHANG Shijie WANG Fengchang WU Xianghong YUAN Ying ZHANG |
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| 作者单位： | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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| 摘 要： | A comprehensive study on the chemical composition of wet precipitation was carried out from January 2004 to December 2004 at Jinhua, China. All samples were analyzed for pH, electrical conductivity and major ions （F, Cl, NO3,. SO4^2-, K^＋, Na^＋, Ca^2＋, Mg^2＋. and NH4^＋）. The results showed that SO4^2- is one of the dominant anions, accounting for 66.1% of the measured anions in precipitation, while NH4^＋ and Ca^2＋ account for 56.6% and 33.4% of the measured cations, respectively. Even though the concentrations of SO4^2- and NO3^- were not high relative to those in the northern areas of China, rainwater in the studied area is typically acidic with a volume-weighted mean pH of 4.54 due to the lack of neutralization in precipitation. The fractional acidity value suggested that about 76% of acid was neutralized by alkaline constituents. On the other hand, H^＋ showed no significant correlation with other ionic species, which indicates that its acidity might be attributed to the comprehensive effect of all the acidifying and neutralizing ions rather than one major ion in precipitation. A good correlation between Ca^2＋ and Mg^2＋, as well as between Na^＋ and Cl^-, indicated these ions are commonly of crustal and marine origin, respectively. Other relatively good correlations were observed between NH4^＋ and SO4^2-, Ca^2＋ and SO4^2-, Mg^2＋ and SO4^2-, Mg^2＋ and NO3^-, and Mg^2＋ and Cl^-. These results were attributed to the atmospheric chemical reactions of the acids H2SO4, HNO3 and HCl with alkaline compounds such as NH3 and/or carbonate materials. High enrichment factor of marine source for SO4^2-, Ca^2＋ and K^＋ indicated that large amounts of these ions came mainly from a non-marine source. Similarly, a high enrichment factor of soil for SO4^2-, NO3^- and CI also suggested that most of these ions did not come from soil source.
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| 关 键 词： | 化学复合物 中和 降水 水文化学 东南地区 |
Chemical composition of wet precipitation at a developing urban site in southeastern China |
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| Miaoyun ZHANG Shijie WANG Fengchang WU Xianghong YUAN Ying ZHANG.Chemical composition of wet precipitation at a developing urban site in southeastern China[J].Chinese Journal of Geochemistry,2006,25(B08):18-18. |
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| Abstract: | |
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| Keywords: | chemical composition neutralization chemical composition precipitation |
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