Chemical speciation of lead in secondary fly ash using X-ray absorption spectroscopy

Shulei Tian; Yingcai Zhu; Bangbang Meng; Jian Guan; Zhiqiang Nie; Qingqi Die; Wei Xu; Meijuan Yu; Qifei Huang

doi:10.1016/j.chemosphere.2018.01.026

Chemical speciation of lead in secondary fly ash using X-ray absorption spectroscopy

Chemosphere. 2018 Apr:197:362-366. doi: 10.1016/j.chemosphere.2018.01.026.

Authors

Shulei Tian¹, Yingcai Zhu², Bangbang Meng³, Jian Guan⁴, Zhiqiang Nie¹, Qingqi Die¹, Wei Xu², Meijuan Yu⁵, Qifei Huang⁶

Affiliations

¹ State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
² Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.
³ College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China.
⁴ Tangshan Iron and Steel Group Company Limited, Energy and Environmental Protection Department, Tangshan 063000, China.
⁵ Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China. Electronic address: yumj@ihep.ac.cn.
⁶ State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: huangqf@craes.org.cn.

PMID: 29407806
DOI: 10.1016/j.chemosphere.2018.01.026

Abstract

In this study, fly ash samples were collected from bag houses in a Chinese municipal solid waste incinerator (MSWI) and secondary fly ash (SFA) samples were collected from a high-temperature tubular electric furnace by thermal treatment of MSWI fly ash at 1050, 1100, 1150, 1200, and 1250 °C.We determined the speciation and atomic coordinates of lead in SFA using X-ray absorption spectroscopy (XAS) techniques. The results obtained by X-ray absorption near edge structure (XANES) spectra revealed that the mass fraction of PbO in MSWI fly ash was 57.9% (wt %) while PbCl₂ and PbS were the dominant species in SFA. Extended X-ray absorption fine structure (EXAFS) data analysis indicated the atomic coordinates of Pb were proportional to the weights of PbCl₂ and PbS, in good agreement with the XANES spectra. These findings highlight lead evaporation processes in the MSWI fly ash during heat treatment and provide a method for consistent speciation analysis of environmental samples using XAS.

Keywords: Evaporation; MSWI fly ash; Secondary fly ash; X-ray absorption spectroscopy.

MeSH terms

Air Pollutants / analysis*
Carbon / chemistry
Coal Ash / chemistry
Incineration / methods*
Lead / analysis*
Metals, Heavy / analysis
Particulate Matter / chemistry
Refuse Disposal / methods
Solid Waste / analysis*
X-Ray Absorption Spectroscopy
X-Rays

Substances

Air Pollutants
Coal Ash
Metals, Heavy
Particulate Matter
Solid Waste
Lead
Carbon