Identification of sources of lead in the atmosphere by chemical speciation using X-ray absorption near-edge structure (XANES) spectroscopy

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• 作者：Kohei Sakata ; Aya Sakaguchi ; Masaharu Tanimizu ; Yuichi Takaku ; Yuka Yokoyama ; Yoshio Takahashi
• 关键词：Lead ; lead speciation ; XAFS spectroscopy ; size-fractionated aerosol sample
• 刊名：Journal of Environmental Sciences
• 出版年：1 February, 2014
• 年：2014
• 卷：26
• 期：2
• 页码：343-352
• 全文大小：1105 K

文摘

Sources of Pb pollution in the local atmosphere together with Pb species, major ions, and heavy metal concentrations in a size-fractionated aerosol sample from Higashi-Hiroshima (Japan) have been determined by X-ray absorption near-edge structure (XANES) spectroscopy, ion chromatography, and ICP-MS/AES, respectively. About 80% of total Pb was concentrated in fine aerosol particles. Lead species in the coarse aerosol particles were PbC₂O₄, 2PbCO₃路Pb(OH)₂, and Pb(NO₃)₂, whereas Pb species in the fine aerosol particles were PbC₂O₄, PbSO₄, and Pb(NO₃)₂. Chemical speciation and abundance data suggested that the source of Pb in the fine aerosol particles was different from that of the coarse ones. The dominant sources of Pb in the fine aerosol particles were judged to be fly ash from a municipal solid waste incinerator and heavy oil combustion. For the coarse aerosol particles, road dust was considered to be the main Pb source. In addition to Pb species, elemental concentrations in the aerosols were also determined. The results suggested that Pb species in size-fractionated aerosols can be used to identify the origin of aerosol particles in the atmosphere as an alternative to Pb isotope ratio measurement.