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USGS CMG Menlo Park Organic Geochemistry Mass Spectrography Lab--M3043A

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Main Campus  (  Bldg. 2 - 1st floor Bldg. 2 - 2nd floor Bldg. 15 - 1st floor Bldg. 15 - 3rd floor  )
O'Brien St.  (  1020 O'Brien 1030 O'Brien 1040 O'Brien 1050 O'Brien  )

Room Organic Geochemistry Mass Spectrography Laboratory
Location Rm. M3043A, 3rd floor, Bldg. 15 (McKelvey Bldg.)
Contact Robert J. Rosenbauer
Description Biomarkers are analyzed by gas chromatography and mass spectroscopy (GC/MS) after solvent extraction of a sediment, tar, or oil mixture and then liquid chromatography to separate and purify the compounds of interest. This laboratory has state-of-the-art automated GC/MS. Biomarkers are determined by ratios of compounds based on their mass spectral response. Presently, quantitation is performed mainly by the use of external standards, although calibration procedures are in place to use internal standards and surrogates to more accurately calculate absolute concentrations of selected compounds.

Other analytes include organic contaminants (pesticides, PAH's) released to the environment from anthropogenic activities. Some of these compounds can have deleterious effects on ecosystems even at low concentrations. Current activities are focused in the Monterey Bay National Marine Sanctuary, the LA Shelf, and the Santa Barbara and Eel River Basins.

  1. Hewlett Packard Gas chromatograph model 6890
  2. Hewlett Packard 6890 series autosampler and injection system
  3. Hewlett Packard Gas mass selective detector model 5973
  4. Hewlett Packard Gas chromatograph model/mass spectrometer 5995A
  5. Hydrogen generator
  6. Purified compressed air generator

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