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  • Title: [Effect of sand dust weather on major water-soluble ions in PM10 in Lanzhou, China].
    Author: Wang F, Chen Q, Zhang WY, Guo YT, Zhao LB.
    Journal: Huan Jing Ke Xue; 2014 Jul; 35(7):2477-82. PubMed ID: 25244826.
    Abstract:
    The major water-soluble ions (Ca(2+), NH(4+), Mg(2+), K(+), Na(+), SO4(2-), NO3(-) and Cl-(-) in PM10 at 1-h interval were measured by an online analyzer for monitoring of Aerosols and Gases (MARGA) at the campus of Lanzhou University, from April 1 to June 30, 2011. There were 15 days of dust weather during the monitoring period. The main water-soluble ions in PM10 were Ca(2+), SO4(2-) and NO3(-). The concentration of NO3(-) and NH4(+) decreased during blowing sand weather comparing with non-dust, this phenomenon showed that the dust weather had the function of eliminating the local anthropogenic emissions. As the soil pollution marker, the concentration of Mg(2+), Na(+) and Ca(2+) increased during dust weather comparing with non-dust. The correlation coefficients between Na(+) and Mg(2+), Na(+) and Ca(2+), Mg(2+) and Ca(2+) during dust weather were 0.520, 0.659 and 0.671, respectively. The similar correlation coefficients indicated that some fraction of these species was derived from the same sources, such as soil dust. The correlation coefficients between Na(+) and Mg(2+), Na(+) and Ca(2+), Mg(2+) and Ca(2+) during non-dust weather were not strong, only 0.065, 0.131 and 0.163, respectively. The low correlation coefficients indicated that these species were derived from different sources. The mass concentration of Cl(-) in the dust weather was significantly higher than that of floating dust and non dust, indicating that soil dust was the main source of Cl(-).
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