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Title: Gas-phase pyrolysis products emitted by prescribed fires in pine forests with a shrub understory in the southeastern United States

Abstract

Here we confirm pyrolysis gases from prescribed burns conducted inpine forests with a shrub understory captured using a manual extraction device. The device selectively sampled emissions ahead of the flame front,minimizing the collection of oxidized gases, with the captured gases analyzed in the laboratory using infrared (IR) absorption spectroscopy. Results show that emission ratios (ERs) relative to CO for ethene and acetylene were significantly greater than in previous fire studies, suggesting that the sample device was able to collect gases predominantly generated prior to ignition. Additional evidence that ignition had not begun was corroborated by novel IR detections of several species, in particular naphthalene. With regards to oxygenated species, several aldehydes (acrolein, furaldehyde, acetaldehyde,formaldehyde) and carboxylic acids (formic, acetic) were all observed;results show that ERs for acetaldehyde were noticeably greater, while ERs for formaldehyde and acetic acid were lower compared to other studies. The acetylene-to-furan ratio also suggests that high-temperature pyrolysis was the dominant process generating the collected gases.

Authors:
 [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2];  [2];  [3];  [3];  [3];  [4];  [5]; ORCiD logo [3]; ORCiD logo [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. USDA Forest Service, Missoula, MT (United States)
  3. USDA Forest Service, Riverside, CA (United States)
  4. USDA Forest Service, Seattle, WA (United States)
  5. Univ. of Washington, Seattle, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1557233
Report Number(s):
PNNL-SA-141102
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Volume: 19; Journal Issue: 15; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Scharko, Nicole K., Oeck, Ashley M., Myers, Tanya L., Tonkyn, Russell G., Banach, Catherine A., Baker, Stephen P., Lincoln, Emily N., Chong, Joey, Corcoran, Bonni M., Burke, Gloria M., Ottmar, Roger D., Restaino, Joseph C., Weise, David R., and Johnson, Timothy J. Gas-phase pyrolysis products emitted by prescribed fires in pine forests with a shrub understory in the southeastern United States. United States: N. p., 2019. Web. doi:10.5194/acp-19-9681-2019.
Scharko, Nicole K., Oeck, Ashley M., Myers, Tanya L., Tonkyn, Russell G., Banach, Catherine A., Baker, Stephen P., Lincoln, Emily N., Chong, Joey, Corcoran, Bonni M., Burke, Gloria M., Ottmar, Roger D., Restaino, Joseph C., Weise, David R., & Johnson, Timothy J. Gas-phase pyrolysis products emitted by prescribed fires in pine forests with a shrub understory in the southeastern United States. United States. doi:10.5194/acp-19-9681-2019.
Scharko, Nicole K., Oeck, Ashley M., Myers, Tanya L., Tonkyn, Russell G., Banach, Catherine A., Baker, Stephen P., Lincoln, Emily N., Chong, Joey, Corcoran, Bonni M., Burke, Gloria M., Ottmar, Roger D., Restaino, Joseph C., Weise, David R., and Johnson, Timothy J. Thu . "Gas-phase pyrolysis products emitted by prescribed fires in pine forests with a shrub understory in the southeastern United States". United States. doi:10.5194/acp-19-9681-2019. https://www.osti.gov/servlets/purl/1557233.
@article{osti_1557233,
title = {Gas-phase pyrolysis products emitted by prescribed fires in pine forests with a shrub understory in the southeastern United States},
author = {Scharko, Nicole K. and Oeck, Ashley M. and Myers, Tanya L. and Tonkyn, Russell G. and Banach, Catherine A. and Baker, Stephen P. and Lincoln, Emily N. and Chong, Joey and Corcoran, Bonni M. and Burke, Gloria M. and Ottmar, Roger D. and Restaino, Joseph C. and Weise, David R. and Johnson, Timothy J.},
abstractNote = {Here we confirm pyrolysis gases from prescribed burns conducted inpine forests with a shrub understory captured using a manual extraction device. The device selectively sampled emissions ahead of the flame front,minimizing the collection of oxidized gases, with the captured gases analyzed in the laboratory using infrared (IR) absorption spectroscopy. Results show that emission ratios (ERs) relative to CO for ethene and acetylene were significantly greater than in previous fire studies, suggesting that the sample device was able to collect gases predominantly generated prior to ignition. Additional evidence that ignition had not begun was corroborated by novel IR detections of several species, in particular naphthalene. With regards to oxygenated species, several aldehydes (acrolein, furaldehyde, acetaldehyde,formaldehyde) and carboxylic acids (formic, acetic) were all observed;results show that ERs for acetaldehyde were noticeably greater, while ERs for formaldehyde and acetic acid were lower compared to other studies. The acetylene-to-furan ratio also suggests that high-temperature pyrolysis was the dominant process generating the collected gases.},
doi = {10.5194/acp-19-9681-2019},
journal = {Atmospheric Chemistry and Physics (Online)},
issn = {1680-7324},
number = 15,
volume = 19,
place = {United States},
year = {2019},
month = {8}
}

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Works referenced in this record:

Influence of pyrolysis temperature and time on the cellulose fast pyrolysis products: Analytical Py-GC/MS study
journal, November 2011

  • Lu, Qiang; Yang, Xiao-chu; Dong, Chang-qing
  • Journal of Analytical and Applied Pyrolysis, Vol. 92, Issue 2, p. 430-438
  • DOI: 10.1016/j.jaap.2011.08.006