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| Physical and Chemical Characteristics of Individual Particle during a Typical Haze Episode in Urumqi, Xinjian, China |
| Wang Jiang1, Hong Wen2, Wu Xinping3, Lu Hui4 |
1. Xinjiang Meteorological Observatory, Urumqi 830002, China;
2. Urumqi Institute of Environmental Protection, Urumqi 830000, China;
3. Tazhong Meteorological Station, Tazhong 841000, Xinjiang, China;
4. Tacheng Meteorological Burean, Tacheng 834700, Xinjiang, China |
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Abstract In order to understand the chemical composition of atmospheric particulates during the winter haze espsode in Urumqi, and to explore the causes of haze formation, the scanning electron microscopy and energy dispersive X-ray spectroscopy(SEM/EDX) were used to study the chemical composition and microscopic morphology of aerosol PM10 samples collected during the typical haze and no-haze episodes in February 2013. The results indicated that the fine particle concentration showed a sharp rise in the haze formation process, and the PM1.0/PM10 ratio could reach 0.77. There exists significant difference in chemical composition and microscopic morphology of PM10 between haze and no-haze episodes. Regular gypsum particles could account for 71.1% in haze weather, a percentage obviously higher than that in no-haze episode. This fact showed that the surface sulfuration of aerosol particles was extremely severe, and the large amount of aluminosilicate particles in fly ash came from coal combustion pollution. As the main component of secondary inorganic particles, sulfate particles accounted for 24.6% in haze episode, but it only accounted for 16.1% on no-haze day. Sulfate was the primary factor contributing to this heavy haze formation in Urumqi.
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Received: 06 April 2015
Published: 20 November 2015
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2015, Vol. 35 
