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To identify the origin of individual PM 2.5 particles in Shanghai air, synchrotron X-ray fluorescence microprobe at BL-4A beamline of Photon Factory was applied to analysis of the individual PM 2.5 particles. By using excitation energy of 17.4keV, trace elements of environmental concern in the fine particles, like S, Cr, Sr and Pb can be detected. Only 60s of irradiation was needed...
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