Work

Tar Balls from Deep Water Horizon Oil Spill: Environmentally Persistent Free Radicals (EPFR) Formation During Crude Weathering

Year: 2013

Type: article

Abstract: Tar balls collected from the Gulf of Mexico shores of Louisiana and Florida after the BP oil spill have shown the presence of electron paramagnetic resonance (EPR) spectra characteristic of organic free radicals as well as transition metal ions, predominantly iron(III) and manganese(II). Two types of organic radicals were distinguished: an asphaltene radical species typically found in crude oil (g = 2.0035) and a new type of radical resulting from the environmental transformations of crude (g = 2.0041-47). Pure asphaltene radicals are resonance stabilized over a polyaromatic structure and are stable in air and unreactive. The new radicals were identified as products of partial oxidation of crude components and result from the interaction of the oxidized aromatics with metal ion centers. These radicals are similar to semiquinone-type, environmentally persistent free radicals (EPFRs) previously observed in combustion-generated particulate and contaminated soils.

Source: Environmental Science & Technology

DOI: 10.1021/es305157w

Authors: Lucy W. Kiruri, Barry Dellinger, Slawo Lomnicki

Institution: Louisiana State University

Language: English

Topic: Oil Spill Detection and Mitigation

Subfield: Pollution

Field: Environmental Science

Domain: Physical Sciences

Open Access status: green

Funder: National Institute of Environmental Health Sciences

Awards: G235075893, G377101333