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Geophysical Monograph Series

 

Keywords

  • Gulf of Mexico
  • PAH
  • Deepwater Horizon
  • plume
  • TPH
  • oil spill

Index Terms

  • 1055 Geochemistry: Organic and biogenic geochemistry
  • 4850 Oceanography: Biological and Chemical: Marine organic chemistry
  • 4251 Oceanography: General: Marine pollution
  • 4803 Oceanography: Biological and Chemical: Analytical chemistry

Article

GEOPHYSICAL MONOGRAPH SERIES, VOL. 195, PP. 77-82, 2011

Analyses of Water Samples From the Deepwater Horizon Oil Spill: Documentation of the Subsurface Plume

T. L. Wade, S. T. Sweet, J. L. Sericano, N. L. Guinasso Jr., A.-R. Diercks, R. C. Highsmith, V. L. Asper, D. Joung, A. M. Shiller, S. E. Lohrenz, and S. B. Joye

Surface and subsurface water samples were collected in the vicinity of the Deepwater Horizon (DWH) wellhead in the Gulf of Mexico. Samples were extracted with dichloromethane and analyzed for a toxic component, polycyclic aromatic hydrocarbons (PAHs), using total scanning fluorescence (TSF) and by gas chromatography/mass spectrometry (GC/MS). An aliquot of fresh, floating oil from a surface sample was used as a DWH oil reference standard. Twelve of 19 samples collected from 24 May 2010 to 6 June 2010 on the R/V Walton Smith cruise contained TSF maximum intensities above background (0.7 µg L−1 based on 1 L sample size). These 12 samples had total petroleum hydrocarbon (TPH) concentrations as measured by quantitative gas chromatography flame ionization detector (FID) ranging from 2 to 442 µg L−1. Quantitative GC/MS analysis of these 12 samples resulted in total PAH concentrations ranging from 0.01 to 59 µg L−1. Low molecular weight, more water-soluble naphthalene and alkylated naphthalene dominated the PAH composition patterns for 11 of the 12 water samples. Sample 12 exhibited substantially reduced concentrations of naphthalenes relative to other PAH compounds. The total PAH concentrations were positively correlated (R2 = 0.80) with the TSF maximum intensity (MI). TSF is a simple, rapid technique providing an accurate prediction of the amount of PAH present in a sample. TSF-derived estimates of the relative contribution of PAH present in the oil provided evidence that PAH represented ∼10% of the higher molecular weight TPH. The subsurface oil plume was confirmed by the analyses of discrete water samples for TSF, TPH, and PAH.

Citation: Wade, T. L., et al. (2011), Analyses of water samples from the Deepwater Horizon oil spill: Documentation of the subsurface plume, in Monitoring and Modeling the Deepwater Horizon Oil Spill: A Record-Breaking Enterprise, Geophys. Monogr. Ser., vol. 195, edited by Y. Liu et al., pp. 77–82, AGU, Washington, D. C., doi:10.1029/2011GM001103.

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