Atmospheric carbonation reduces bioaccessibility of PAHs in industrially contaminated soil

S. Humel, J. Schritter, M. Sumetzberger-Hasinger, F. Ottner, Philipp Mayer, A.P. Loibner*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Sorptive Bioaccessibility Extraction (SBE) was used to monitor changes in accessibility of polycyclic aromatic hydrocarbons (PAHs) during storage of historically contaminated alkaline soil (Σ US EPA 16 + 2 further PAHs: 2452 ± 69 mg kg−1, n = 3). While total concentrations of PAHs were rather stable during storage for 561 days at 4 °C, PAH accessibility declined by 95% due to atmospheric carbonation. The formation of carbonates was evidenced by an increase of inorganic soil carbon and by carbonate coatings on black soil particles (SEM-EDX) that could be dissolved by providing neutral to acidic soil conditions. Subjecting soil (252 days of storage) to biodegradation at pH 7 resulted in a degraded fraction of PAHs equivalent to the accessible PAH fraction of soil as received (PAHs with log Kow <5). The present study addresses important interactions and relationships between carbonation of soil, aging of PAHs in soil and related changes in PAH accessibility. A main finding was the reversibility of this retention mechanism, a changing environment (e.g. reduction of pH below 8) can result in a rise of accessible PAHs and consequently in an increase of exposure and associated risk.
Original languageEnglish
Article number121092
JournalJournal of Hazardous Materials
Volume383
Number of pages8
ISSN0304-3894
DOIs
Publication statusPublished - 2020

Keywords

  • Soil
  • Polycyclic aromatic hydrocarbons (PAHs)
  • Accessibility
  • Atmospheric carbonation
  • Entrapment

Cite this

Humel, S. ; Schritter, J. ; Sumetzberger-Hasinger, M. ; Ottner, F. ; Mayer, Philipp ; Loibner, A.P. / Atmospheric carbonation reduces bioaccessibility of PAHs in industrially contaminated soil. In: Journal of Hazardous Materials. 2020 ; Vol. 383.
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abstract = "Sorptive Bioaccessibility Extraction (SBE) was used to monitor changes in accessibility of polycyclic aromatic hydrocarbons (PAHs) during storage of historically contaminated alkaline soil (Σ US EPA 16 + 2 further PAHs: 2452 ± 69 mg kg−1, n = 3). While total concentrations of PAHs were rather stable during storage for 561 days at 4 °C, PAH accessibility declined by 95{\%} due to atmospheric carbonation. The formation of carbonates was evidenced by an increase of inorganic soil carbon and by carbonate coatings on black soil particles (SEM-EDX) that could be dissolved by providing neutral to acidic soil conditions. Subjecting soil (252 days of storage) to biodegradation at pH 7 resulted in a degraded fraction of PAHs equivalent to the accessible PAH fraction of soil as received (PAHs with log Kow <5). The present study addresses important interactions and relationships between carbonation of soil, aging of PAHs in soil and related changes in PAH accessibility. A main finding was the reversibility of this retention mechanism, a changing environment (e.g. reduction of pH below 8) can result in a rise of accessible PAHs and consequently in an increase of exposure and associated risk.",
keywords = "Soil, Polycyclic aromatic hydrocarbons (PAHs), Accessibility, Atmospheric carbonation, Entrapment",
author = "S. Humel and J. Schritter and M. Sumetzberger-Hasinger and F. Ottner and Philipp Mayer and A.P. Loibner",
year = "2020",
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journal = "Journal of Hazardous Materials",
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Atmospheric carbonation reduces bioaccessibility of PAHs in industrially contaminated soil. / Humel, S.; Schritter, J.; Sumetzberger-Hasinger, M.; Ottner, F.; Mayer, Philipp; Loibner, A.P.

In: Journal of Hazardous Materials, Vol. 383, 121092, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Atmospheric carbonation reduces bioaccessibility of PAHs in industrially contaminated soil

AU - Humel, S.

AU - Schritter, J.

AU - Sumetzberger-Hasinger, M.

AU - Ottner, F.

AU - Mayer, Philipp

AU - Loibner, A.P.

PY - 2020

Y1 - 2020

N2 - Sorptive Bioaccessibility Extraction (SBE) was used to monitor changes in accessibility of polycyclic aromatic hydrocarbons (PAHs) during storage of historically contaminated alkaline soil (Σ US EPA 16 + 2 further PAHs: 2452 ± 69 mg kg−1, n = 3). While total concentrations of PAHs were rather stable during storage for 561 days at 4 °C, PAH accessibility declined by 95% due to atmospheric carbonation. The formation of carbonates was evidenced by an increase of inorganic soil carbon and by carbonate coatings on black soil particles (SEM-EDX) that could be dissolved by providing neutral to acidic soil conditions. Subjecting soil (252 days of storage) to biodegradation at pH 7 resulted in a degraded fraction of PAHs equivalent to the accessible PAH fraction of soil as received (PAHs with log Kow <5). The present study addresses important interactions and relationships between carbonation of soil, aging of PAHs in soil and related changes in PAH accessibility. A main finding was the reversibility of this retention mechanism, a changing environment (e.g. reduction of pH below 8) can result in a rise of accessible PAHs and consequently in an increase of exposure and associated risk.

AB - Sorptive Bioaccessibility Extraction (SBE) was used to monitor changes in accessibility of polycyclic aromatic hydrocarbons (PAHs) during storage of historically contaminated alkaline soil (Σ US EPA 16 + 2 further PAHs: 2452 ± 69 mg kg−1, n = 3). While total concentrations of PAHs were rather stable during storage for 561 days at 4 °C, PAH accessibility declined by 95% due to atmospheric carbonation. The formation of carbonates was evidenced by an increase of inorganic soil carbon and by carbonate coatings on black soil particles (SEM-EDX) that could be dissolved by providing neutral to acidic soil conditions. Subjecting soil (252 days of storage) to biodegradation at pH 7 resulted in a degraded fraction of PAHs equivalent to the accessible PAH fraction of soil as received (PAHs with log Kow <5). The present study addresses important interactions and relationships between carbonation of soil, aging of PAHs in soil and related changes in PAH accessibility. A main finding was the reversibility of this retention mechanism, a changing environment (e.g. reduction of pH below 8) can result in a rise of accessible PAHs and consequently in an increase of exposure and associated risk.

KW - Soil

KW - Polycyclic aromatic hydrocarbons (PAHs)

KW - Accessibility

KW - Atmospheric carbonation

KW - Entrapment

U2 - 10.1016/j.jhazmat.2019.121092

DO - 10.1016/j.jhazmat.2019.121092

M3 - Journal article

VL - 383

JO - Journal of Hazardous Materials

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