Cited by 39Toxic Organic Pollutants ImpactFire effects on ecosystemsEnvironmental and Analytical Chemistry Studies

Polycyclic aromatic hydrocarbons in soil organic horizons depending on the soil burn severity and type of ecosystem.

Rey‐Salgueiro, Ledicia, Martínez‐Carballo, Elena, Merino, Agustín, Vega, José A., Fonturbel, M. Teresa, Simal‐Gandara, Jesus·2018·Land Degradation & Development

Abstract

Because forest fires are a source of polycyclic aromatic hydrocarbons (PAHs), the influence of burnt conditions is of paramount importance and has not been thoroughly studied yet. In this study, two types of forest stands (Pinus nigra and Pinus pinaster) and two shrubland systems (Erica arborea and Ulex europaeus), differing in litter properties (composition and flammability), were considered. Changes in PAH levels were analysed in unburnt and charred litter, and they were related to different levels of soil burn severity and the organic matter composition of the charred litter, including charcoal and/or ashes. For monitoring PAH levels, an analytical method to determine them in unburnt and burnt woodland samples by pressure liquid extraction using a solid phase extraction cleanup was optimized. The highest levels of PAHs were found in the charred litter of P. pinaster (especially at soil burn severity = 200–400 °C), followed by U. europaeus, which presented similar concentration than Erica arborea and, finally, P. nigra. An association between the low molecular weight PAHs and 50% burn‐off temperature differential scanning calorimetry supports the idea of fire smoke as the main source of low molecular weight PAHs in charred biomass generated at temperatures of 200–400 °C. Instead, the fraction of high molecular weight PAHs is related to hydrogen‐to‐carbon and oxygen‐to‐carbon ash‐free dry weight, with charring depending on their organic matter content in the burnt material. PAH mobility will depend on the solubility of the organic matter, which is higher at higher pHs. The higher risk is the transport downstream to rivers or wet systems. Copyright © 2017 John Wiley & Sons, Ltd.

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Crossref · 10.1002/ldr.2806

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  • The type of fuel and variations in combustion temperatures and oxygen availability are thought to strongly affect the concentration and type of PAHs in ash.

    “The type of fuel and variations in combustion temperatures and oxygen availability are thought to strongly affect the concentration and type of PAHs in ash (Enell et al. 2008;Rey-Salgueiro et al. 2018).”

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Authors
Rey‐Salgueiro, L., Martínez‐Carballo, E., Merino, A., Vega, J. A., Fonturbel, M. T., & Simal‐Gandara, J.
Affiliations
  • Universidade de Vigo (ES)
  • Sustainable Forest Management Unit, Department of Soil Science and Agricultural Chemistry University of Santiago de Compostela–Lugo Campus 27002 Lugo Spain
  • Forest Research Centre Lourizán Consellería de Medio Rural, Xunta de Galicia PO Box 127. 36080 Pontevedra Spain
  • Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Food Science and Technology Faculty University of Vigo–Ourense Campus 32004 Ourense Spain
Venue
Land Degradation & Development
Publisher
Wiley
Published
2017-10-06
Volume
29
Issue
7
Pages
2112-2123
ISSN
  • 1085-3278 (ISSN-L)
  • 1099-145X
OpenAlex
W2751068560
Cited by
39
References
56
Citations by year
2026: 5 · 2025: 7 · 2024: 2 · 2023: 6 · 2022: 6 · 2021: 3 · 2020: 5 · 2019: 3 · 2018: 2
FWCI
1.48
Type
journal article
Language
en
Open access
closed
Locations
Land Degradation and Development (publishedVersion)
Funders
European Regional Development Fund (CIA‐2016)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
  • Physical Sciences › Environmental Science › Global and Planetary Change › Fire effects on ecosystems
  • Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
Keywords
polycyclic aromatic hydrocarbons, soil burn severity, forest fires, fire smoke, Pinus pinaster, Pinus nigra, Erica arborea, Ulex europaeus, shrubland, charcoal, ash, low molecular weight PAHs, high molecular weight PAHs, soil organic matter, solid-phase extraction

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