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PM10 samples were collected on haze days (visibility <10 km) within Zhengzhou City, North China. Mineralogical and chemical compositions of these PM10 samples were determined by X-ray diffraction and X-ray fluorescence analysis, respectively. Results indicated that the crystalline phase in PM10 was composed of crustal minerals, sulfate, and chloride. The sulfate mainly included koktaite, gypsum,...
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