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Interlaboratory Analytical Comparison Study to Support Deepwater Horizon Natural Resource Damage Assessment: Description and Results for Marine Sediment QA10SED01

To support natural resource damage assessment (NRDA) in response to the Deepwater Horizon (DWH) oil spill in the Gulf of Mexico, a large number of coastal sediment and tissue (i.e., oysters) samples have been collected outside of the spill zone to define baseline environmental conditions prior to being exposed to oil. Analysis of oiled sediments and oil-exposed oysters will continue for the foreseeable future. To support these efforts, NOAA will require additional analytical laboratories to perform NRDA sample analyses To compare the data among these laboratories, inter-laboratory comparison studies have been initiated with the results from the first exercise, marine sediment QA10SED01 reported here. In this exercise, selected polycyclic aromatic hydrocarbons (PAHs), alkylated PAHs, hopanes, and steranes were determined in the exercise material, which consisted of wet frozen sediment, and in SRM 1941b Organics in Marine Sediment. The results from this first exercise are reported along with a summary of the analytical methods used.