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Characterization and Partitioning Behavior of Creosote in Different Matrices: Soil, Water, and Air

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Abstract

Creosote is a multicomponent oil classified as a dense non-aqueous phase liquid (DNAPL) produced from coal tar distillation. The concept of phase distribution is critical in decision-making to remediate contaminated sites. The creosote mass transfer between sorbed, aqueous, vapor, and DNAPL phases is controlled by physicochemical characteristics, geology of the site, and environment conditions. This study evaluated phase distribution of the main polycyclic aromatic hydrocarbons (PAHs) of creosote in a sandy soil with low organic matter content. The creosote was collected from a contaminated site in São Paulo, Brazil, and was characterized by gas chromatography–mass spectrometry (GC-MS). Clean soil was collected upgradient from the same area. Initially, the soil was artificially contaminated with creosote. After, the contaminated soil was put in contact with clean water in sealed vials for 72 h. Samples of the soil, vapor, and liquid phases were collected and analyzed by GC-MS. In total, 50 compounds were identified in the creosote, and 9 PAHs were selected to be studied, which represented around 30% of total creosote mass. The major contaminant concentration was detected in the sorbed phase. For instance, naphthalene mass was distributed in sorbed (33.0%), DNAPL (1.5%), aqueous (3.4%), and vapor (0.2%) phases. The results provided an understanding of the contaminant species partitioning that occurs in a real contaminated site.

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Abbreviations

ACE:

Acenaphthene

ANT:

Anthracene

BAA:

Benz[a]anthracene

DCM:

Dichloromethane

DNAPL:

Dense non-aqueous phase liquid

FLT:

Fluoranthene

FLU:

Fluorene

GC-MS:

Gas chromatography–mass spectrometry

MNAP:

2-Methylnaphthalene

NAP:

Naphthalene

NAPL:

Non-aqueous phase liquid

PAHs:

Polycyclic aromatic hydrocarbons

PHE:

Phenanthrene

PYR:

Pyrene

SVOC:

Semi-volatile organic compound

UQG:

Unquantified group

US EPA:

United States Environmental Protection Agency

VOC:

Volatile organic compound

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Acknowledgments

The authors would like to express their gratitude to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Project PROCAD No. 88887.124192/2014-00), to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Process No. 140302/2016-6), and to the Instituto de Pesquisas Tecnológicas (IPT) for providing the clean soil and creosote samples used in this study.

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Correspondence to Rayanne Macêdo Aranha.

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Macêdo Aranha, R., A. Magalhães, V.M., P. Mendes, G. et al. Characterization and Partitioning Behavior of Creosote in Different Matrices: Soil, Water, and Air. Water Air Soil Pollut 231, 402 (2020). https://doi.org/10.1007/s11270-020-04772-y

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  • DOI: https://doi.org/10.1007/s11270-020-04772-y

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