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Chemical and sulfur isotopic composition of precipitation in Beijing, China
Zhu G. X.; Guo, Q. J.; Chen, T. B.; Lang, Y. C.; Peters, M.; Tian, L. Y.; Zhang, H. Z.; Wang, C. Y.
Source PublicationEnvironmental Science and Pollution Research
KeywordChemical composition Sources Sulfur isotope Precipitation Beijing acid-rain strontium isotope wet precipitation sulfate deposition southwest china northwest china stable-isotope inorganic-ions urban site rainwater
AbstractChina is experiencing serious acid rain contamination, with Beijing among the worst-hit areas. To understand the chemical feature and the origin of inorganic ions in precipitation of Beijing, 128 precipitation samples were collected and analyzed for major water-soluble ions and delta S-34. The pH values ranged from 3.68 to 7.81 and showed a volume weighted average value (VWA) of 5.02, with a frequency of acid rain of 26.8 %. The VWA value of electrical conductivity (EC) was 68.6 mu S/cm, which was nearly 4 times higher than the background value of northern China. Ca2+ represented the main cation; SO4 (2-) and NO3 (-) were the dominant anion in precipitation. Our study showed that SO4 (2-) and NO3 (-) originated from coal and fossil fuel combustion; Ca2+, Mg2+, and K+ were from the continental sources. The delta S-34 value of SO4 (2-) in precipitation ranged from +2.1 to +12.8aEuro degrees with an average value of +4.7aEuro degrees. The delta S-34 value showed a winter maximum and a summer minimum tendency, which was mainly associated with temperature-dependent isotope equilibrium fractionation as well as combustion of coal with relatively positive delta S-34 values in winter. Moreover, the delta S-34 values revealed that atmospheric sulfur in Beijing are mainly correlated to coal burning and traffic emission; coal combustion constituted a significant fraction of the SO4 (2-) in winter precipitation.
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Document TypeSCI/SSCI论文
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GB/T 7714
Zhu G. X.,Guo, Q. J.,Chen, T. B.,et al. Chemical and sulfur isotopic composition of precipitation in Beijing, China. 2016.
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