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Persistent organic contaminants in Saharan dust air masses in West Africa, Cape Verde and the eastern Caribbean Public Deposited

https://ir.library.oregonstate.edu/concern/articles/mp48sf668

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  • Anthropogenic semivolatile organic compounds (SOCs) that persist in the environment, bioaccumulate, are toxic at low concentrations, and undergo long-range atmospheric transport (LRT) were identified and quantified in the atmosphere of a Saharan dust source region (Mali) and during Saharan dust incursions at downwind sites in the eastern Caribbean (U.S. Virgin Islands, Trinidad and Tobago) and Cape Verde. More organochlorine and organophosphate pesticides (OCPPs), polycyclic aromatic hydrocarbons (PAHs), and polychlorinated biphenyl (PCB) congeners were detected in the Saharan dust region than at downwind sites. Seven of the 13 OCPPs detected occurred at all sites: chlordanes, chlorpyrifos, dacthal, dieldrin, endosulfans, hexachlorobenzene (HCB), and trifluralin. Total SOCs ranged from 1.9–126 ng/m³ (mean = 25 ± 34) at source and 0.05–0.71 ng/m³ (mean = 0.24 ± 0.18) at downwind sites during dust conditions. Most SOC concentrations were 1–3 orders of magnitude higher in source than downwind sites. A Saharan source was confirmed for sampled air masses at downwind sites based on dust particle elemental composition and rare earth ratios, atmospheric back trajectory models, and field observations. SOC concentrations were considerably below existing occupational and/or regulatory limits; however, few regulatory limits exist for these persistent organic compounds. Long-term effects of chronic exposure to low concentrations of SOCs are unknown, as are possible additive or synergistic effects of mixtures of SOCs, biologically active trace metals, and mineral dust particles transported together in Saharan dust air masses.
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  • Garrison, V. H., Majewski, M. S., Foreman, W. T., Genualdi, S. A., Mohammed, A., & Massey Simonich, S. L. (2014). Persistent organic contaminants in Saharan dust air masses in West Africa, Cape Verde and the eastern Caribbean. Science of the Total Environment, 468, 530-543. doi:10.1016/j.scitotenv.2013.08.076
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  • 468
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  • Deep thanks to the Friends of Virgin Islands National Park, National Aeronautic and Space Administration, and the U.S. Geological Survey for providing project financial support and the U.S. Embassy Bamako for in-kind support.
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  • description.provenance : Made available in DSpace on 2014-04-01T18:56:00Z (GMT). No. of bitstreams: 2 SimonichStaciEnvironmentalMolecularToxicologyPersistentOrganicContaminants.pdf: 1898784 bytes, checksum: 9c44da92f77dc5a2f619bdd4c176597a (MD5) SimonichStaciEnvironmentalMolecularToxicologyPersistentOrganicContaminants_SupplementaryData.pdf: 585621 bytes, checksum: eecbc50a1ccacae6627ffb7360114e49 (MD5) Previous issue date: 2014-01-15
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-04-01T18:55:41Z No. of bitstreams: 2 SimonichStaciEnvironmentalMolecularToxicologyPersistentOrganicContaminants.pdf: 1898784 bytes, checksum: 9c44da92f77dc5a2f619bdd4c176597a (MD5) SimonichStaciEnvironmentalMolecularToxicologyPersistentOrganicContaminants_SupplementaryData.pdf: 585621 bytes, checksum: eecbc50a1ccacae6627ffb7360114e49 (MD5)

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