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Zinc isotopic composition of particulate matter generated during the combustion of coal and coal + tire-derived fuels

Environmental Science and Technology

By:
, , ,
DOI: 10.1021/es102439g

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Abstract

Atmospheric Zn emissions from the burning of coal and tire-derived fuel (TDF) for power generation can be considerable. In an effort to lay the foundation for tracking these contributions, we evaluated the Zn isotopes of coal, a mixture of 95 wt % coal + 5 wt % TDF, and the particulate matter (PM) derived from their combustion in a power-generating plant. The average Zn concentrations and δ(66)Zn were 36 mg/kg and 183 mg/kg and +0.24‰ and +0.13‰ for the coal and coal + TDF, respectively. The δ(66)Zn of the PM sequestered in the cyclone-type mechanical separator was the lightest measured, -0.48‰ for coal and -0.81‰ for coal+TDF. The δ(66)Zn of the PM from the electrostatic precipitator showed a slight enrichment in the heavier Zn isotopes relative to the starting material. PM collected from the stack had the heaviest δ(66)Zn in the system, +0.63‰ and +0.50‰ for the coal and coal + TDF, respectively. Initial fractionation during the generation of a Zn-rich vapor is followed by temperature-dependent fractionation as Zn condenses onto the PM. The isotopic changes of the two fuel types are similar, suggesting that their inherent chemical differences have only a secondary impact on the isotopic fractionation process.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Zinc isotopic composition of particulate matter generated during the combustion of coal and coal + tire-derived fuels
Series title:
Environmental Science and Technology
DOI:
10.1021/es102439g
Volume
44
Issue:
23
Year Published:
2010
Language:
English
Publisher:
ACS Publications
Publisher location:
Washington, D.C.
Contributing office(s):
University of Texas at El Paso
Description:
6 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
9219
Last page:
9224
Number of Pages:
6
Country:
United States