PAHs in urban soils of two Florida cities: Background concentrations, distribution, and sources
| Autor: | Timothy G. Townsend, Jing Su, Ping Xiang, Yungen Liu, Letuzia M. de Oliveira, Lena Q. Ma, Peng Gao, Evandro B. da Silva |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Soil test Health Toxicology and Mutagenesis 0208 environmental biotechnology Coal combustion products Biomass Distribution (economics) 02 engineering and technology 010501 environmental sciences Risk Assessment 01 natural sciences Soil Benzo(a)pyrene Soil Pollutants Environmental Chemistry Cities Polycyclic Aromatic Hydrocarbons Vehicle Emissions 0105 earth and related environmental sciences business.industry Public Health Environmental and Occupational Health Background concentrations General Medicine General Chemistry Contamination Pollution 020801 environmental engineering Coal Target level Environmental chemistry Soil water Carcinogens Florida Environmental science business Environmental Monitoring |
| Zdroj: | Chemosphere. 214:220-227 |
| ISSN: | 0045-6535 |
| Popis: | Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous organic contaminants, which are found in soils throughout the U.S. The objective of this study was to determine the background concentrations, distributions, and sources of 16 USEPA priority PAHs in two urban soils. A total of 114 soil samples were collected from two large cities in Florida: Orlando and Tampa. The results showed that soils were dominated by high molecular weight PAHs in both cities. The average ∑16-PAHs in Orlando and Tampa soils were 3227 and 4562 μg kg−1, respectively. The averages of 7 carcinogenic PAHs based on the benzo[a]pyrene-equivalent (BaP-EQ) concentrations in the two cities were 452 and 802 μg kg−1. BaP-EQ concentrations in 60–62% of samples were higher than the Florida Soil Cleanup Target Level (FSCTL) for residential soils at 100 μg kg−1 and 20–25% of samples were higher than FSCTL for industrial soils at 700 μg kg−1. Based on molecular diagnostic ratios and PMF modeling, major sources of soil PAHs in both cities were similar, mainly from pyrogenic sources including vehicle emissions, and biomass and coal combustion. Based on ArcGIS mapping, PAH concentrations in soils near business districts and high traffic roads were higher. Thus, it is important to consider background PAH concentrations in urban soils when considering soil remediation. |
| Databáze: | OpenAIRE |
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