Abstract:

This dataset includes collection date and locations for surface oil collected in 2010 and deposited oil collected in 2010 and 2016. Data for 34 surface oil samples and 46 deposited oil residues collected in 2010 includes bulk oxygen content, oxidized hydrocarbon content, carbonyl IR-stretching, and octadecane to phytane ratio. Data from 39 deposited oil samples collected in 2016 contains oxidized hydrocarbon content. Peak ratios for bioindicators are provided for 6 surface samples and 5 deposited residues collected in 2010, 1 deposited residue collected in 2012, and 3 deposited residues collected in 2016. Experimental data provided reports the oxygen and dissolved inorganic concentration data from oil weathered in the field and in the lab, in the presence and absences of salt, and with and without a catalase. These data support the publication: Ward, C.P., Sharpless, C.M., Valentine, D.L., French-McCay, D.P., Aeppli, C., White, H.K., Rodgers, R.P., Gosselin, K.M., Nelson, R.K., & Reddy, C.M. (2018). Partial Photochemical Oxidation Was a Dominant Fate of Deepwater Horizon Surface Oil. Eviron. Sci. Technol., 52(4): 1797-1805. doi: 10.1021/acs.est.7b05948

Suggested Citation:

Collin Ward, cward@whoi.edu. 2018. Dataset for: Partial Photochemical Oxidation Was a Dominant Fate of Deepwater Horizon Surface Oil. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7HX1B6K

Publications:

Ward, C. P., Sharpless, C. M., Valentine, D. L., French-McCay, D. P., Aeppli, C., White, H. K., … Reddy, C. M. (2018). Partial Photochemical Oxidation Was a Dominant Fate of Deepwater Horizon Surface Oil. Environmental Science & Technology, 52(4), 1797–1805. doi:10.1021/acs.est.7b05948

Purpose:

(i) Characterize the chemical evolution of Macondo well oil released during the Deepwater Horizon spill. (ii) Assess the relative importance of sunlight and microbes to observed oxidation

Data Parameters and Units:

Surface Oil 2010: Sample ID; Latitude (decimal degrees); Longitude (decimal degrees); Collection date (DD-MMM-YY); Time after start of spill (days); Distance from well (km); Minimum residence time on sea surface (days); Maximum residence time on sea surface (days); Bulk Oxygen content (%); Oxidized hydrocarbon content (%); Carbonyl IR-stretch (%); Octadecane to phytane (ratio, peak area) Deposited Oil 2010: Sample ID; Latitude (decimal degrees); Longitude (decimal degrees); Collection date (DD-MMM-YY); Time after start of spill (days); Bulk Oxygen content (%); Oxidized hydrocarbon content (%); Carbonyl IR-stretch (%); Octadecane to phytane (ratio, peak area) Deposited Oil 2016: Sample ID; Latitude (decimal degrees); Longitude (decimal degrees); Collection date (DD-MMM-YY); Oxidized hydrocarbon content (%); Octadecane to phytane (ratio, peak area) Biodegradation Indicators: Sample name; Oil type (lab weather, field weathered); Collection date (DD-MMM-YY); Residence time (days); Oxygen content (%); Integrated peak areas (17alpha(H),21Beta(H)-hopane, n-C22, n-C26, n-C30, n-C32, n-C34); Peak ratios; nd - compound was below the analytical detection limit of the instrument Photochemical Oxidation: Oil type (lab weather, field weathered); Light spectrum (full, visible, full+catalase); Treatment (light or dark); Oxygen concentration (microMolar); Dissolved inorganic carbon (DIC, microMolar); Water type (saltwater or deionized)

Methods:

Photochemical oxidation lab experimental methods: Macondo oil was weathered for 2 days at 65 degrees Celsius in a dark lab. Field weathered oil was from Source Oil B or Slick B and was obtained from BP. Fifty microliters of either lab or field weathered oil was used in experiments. 12 mL round-bottom exetainer vials were filled with deionized water and sodium hydroxide was used to adjust the pH to 8.0. In a water bath of 21 degrees Celsius, samples were inverted and exposed to simulated sunlight for 3 hours or dark (control).

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