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Du J.,Guilin Environmental Monitoring Center | Song S.,Guilin Environmental Monitoring Center | Zhang Z.,Guilin Environmental Monitoring Center | Yi C.,Guilin Environmental Monitoring Center | And 7 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

Single Particle Aerosol Mass Spectrometer (SPAMS) was used to analyze the size distribution and chemical composition of fine particles emitted from four typical sources in Guilin. The results showed that the size of most particles except those from road dust ranged from 0.2 μm to 1.25 μm. Chemical components of the four sources measured differed from each other distinctly. Particles from diesel vehicles were dominated by EC cluster which accounted for 74.7% of the total ionized particles, while particles from gasoline vehicles were mostly Calcium-rich which accounted for 86.7% of the total ionized particles. Particles from coal combustion were dominated by Fe and Cr clusters, and they accounted for 59.9% of the total ionized particles. Particles containing levoglucosan from biomass burning accounted for 44.4% of the total ionized particles, and road dust particles were mostly aluminum-rich particles, accounting for 69.4% of the total ionized particles. These unique characteristics enable further source apportionment of ambient fine particles. ©, 2015, Science Press. All right reserved.

Zhong G.-Q.,Southwest University of Science and Technology | Li D.,Southwest University of Science and Technology | Zhang Z.-P.,Guilin Environmental Monitoring Center
Polyhedron | Year: 2016

A novel transition metal-organic framework, [Ni2(μ4-btca)(1,4-bib)2(H2O)2]n, was obtained by the hydrothermal reaction of nickel chloride hexahydrate, 1,2,4,5-benzenetetra-carboxylic acid (H4btca) and 1,4-bis(1H-imidazol-4-yl)benzene (1,4-bib) in an ethanol aqueous solution. The composition and structure of the complex were characterized by elemental analyses, single crystal X-ray diffraction analysis, Fourier transform infrared spectroscopy, thermogravimetry and differential scanning calorimetry. The complex crystallizes in the triclinic system with the P1 space group. Each nickel(II) ion is hexacoordinated in a 2N4O mode and has a slightly distorted octahedral geometry. The thermal decomposition of the complex includes dehydration and pyrolysis of the ligands, and the final residue is nickel oxide. The magnetic property of the complex has been studied by variable temperature magnetic susceptibility measurements, and it possesses weak antiferromagnetic interactions. © 2016 Elsevier Ltd. All rights reserved.

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