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

Environmental Science & Technology
By: , and 

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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 & 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, Toxic Substances Hydrology Program
Description 6 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Environmental Science and Technology
First page 9219
Last page 9224
Country United States