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  • Title: [Chemical characteristics of 9 d continuous precipitation in a typical polluted city: a case study of Guiyang, China].
    Author: Xiao HW, Xiao HY, Wang YL, Tang CG, Liu XY.
    Journal: Huan Jing Ke Xue; 2010 Apr; 31(4):865-70. PubMed ID: 20527163.
    Abstract:
    A study of the continuous precipitation in Guiyang has been taken during October 30 and November 7. The results showed that the range of pH was between 3.65 and 7.20, and volume-weighted mean was 4.24. SO4(2-) was the main anion and volume-weighted mean was 119.06 microeq x L(-1), accounting for 80.63% of total anions. While Ca2+ was the main cation and volume-weighted mean was 48.87 microeq x L(-1), accounting for 48.16% of total cation and NH4+ was 38.38 microeq x L(-1), 37.82%. Good correlations between Mg2+, Ca2+, NH4+ and SO4(2-) are observed, which may exist as MgSO4, CaSO4 and (NH4)2SO4 in the rainwater in Guiyang City. Different ions of the atmosphere had different scavenged ways and rate in the precipitation process. In the initial stage of precipitation, the ions such as Mg2+, which were rich in coarse particles, were quickly removed from atmosphere. However the ions such as NH4+ and SO4(2-), which were rich in fine particles, could remain in the atmosphere for a longer time.
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