A field investigation of UV laser induced luminescence signatures of seawater and of oils spilled on seawater was conducted at 5 scattered sites in Los Angeles Harbor and at 1 site in its principal source of inland flow, Dominguez Channel. A 3471A pulsed ruby laser and a 2573A CW Ar ion laser, both frequency doubled, were used as the remote high power irradiation sources. An 8-in Newtonian telescope with matching f-number was added to the 0.25 m scanning spectrometer-sensor system. The seawater site signatures were relatively intense and similar. The principal peak at about 4500A and general shape of the signatures suggested dominance by aromatics. There were secondary features which differed among the sites. Signatures of light, medium, and heavy oils were established as measurable against the strong background of seawater. Gas chromatograph--mass spectrometer analyses of water samples from the 6 sites showed 19 identified compounds, 8 of which were single ring aromatics. The site concentrations of 19 heavier hydrocarbon molecules, some of which were in the C-14 to C-20 range, were obtained. The signatures indicate that the harbor water contains aromatics, probably from oil, which dominate the site signatures and are among the principal constituents in concentration.

  • Corporate Authors:

    Conference on Analytical Chem & Appl Spectroscopy

    Pittsburgh, PA  United States 
  • Authors:
    • Gross, H G
  • Publication Date: 1976

Media Info

  • Features: References;

Subject/Index Terms

Filing Info

  • Accession Number: 00141598
  • Record Type: Publication
  • Source Agency: Pollution Abstracts
  • Report/Paper Numbers: No. 405
  • Contract Numbers: DOT-CG-51988-A
  • Files: TRIS
  • Created Date: Nov 17 1976 12:00AM