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Polycyclic Aromatic Hydrocarbon Accumulation in Soil Receiving Rooftop Runoff in the Oklahoma City Metropolitan

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Abstract

Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants appearing ubiquitously in the environment with potential impacts on human health. Urban environments tend to have elevated levels of PAHs throughout the atmosphere and soil. Within the Oklahoma City Metropolitan, soil was evaluated for carcinogenic PAH (cPAH) concentration and examined for potential factors influencing presence and magnitude especially in soils receiving direct rooftop runoff. An overall and comparative analysis was performed of PAHs in soils from ninety-two urban sites for a total of 184 soil samples. This cPAH load was compared between soils receiving rooftop runoff and paired reference samples using Wilcoxon Signed-Rank testing, as were rooftop materials (metal, tar, asphalt) and building types (residential, commercial, school) between sites using Kruskall Wallace tests. A majority of locations analyzed had levels of cPAHs above the U.S. Environmental Protection Agency’s soil screening level (SSL) including benzo[a]pyrene (BaP), which was representative of the cPAH concentrations. CPAH concentrations in soils directly receiving rooftop runoff (contact soils) were significantly greater than in paired reference samples. Roofing type did not vary in contributing to cPAH levels. Additionally, schools and commercial contact soils had significantly elevated levels of cPAHs and BaP as compared to residential contact soils. Soil in Oklahoma City Metropolitan had significantly elevated cPAH loads in samples receiving rooftop runoff, but not likely as the result of roofing material. In a post-hoc analysis, buildings used as schools included the most contaminated sites. School soil contamination should be further investigated.

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Correspondence to Sarah Hileman.

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Hileman, S., Belden, J. Polycyclic Aromatic Hydrocarbon Accumulation in Soil Receiving Rooftop Runoff in the Oklahoma City Metropolitan. Water Air Soil Pollut 234, 472 (2023). https://doi.org/10.1007/s11270-023-06440-3

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  • DOI: https://doi.org/10.1007/s11270-023-06440-3

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