Abstract
Abstract Over 1500 samples of oil sheens, slicks and tar balls were collected from the sea surface and along the coastlines in Texas, Louisiana, Mississippi, Alabama and Florida in response to the MC 252 oil spill. Organic geochemistry of these samples was studied in detail through GC, GCMS, sulfur, metals and isotope analyses. High molecular weight biomarkers of the saturated fraction appeared to be most resistant to weathering, and were preferentially used for source identification. A set of weathering-resistant source-maturity- and biodegradation-specific biomarker ratios as well as carbon isotope composition of SARA fractions were used to identify if the sheen, slick and tar ball samples were related to MC 252 oil spill or had other origins. Among the samples analyzed to date, those that appear to be MC 252 oil occurred primarily within the areal extent of sea surface oil and along coastlines of Louisiana and Alabama where the most oil emulsion reached the shore. Oil samples outside these areas were m...
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