Field method developed for testing oil sheens on surface water using sheen nets

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A pipeline spill in Michigan contaminated a river with crude oil.  Almost one year later, oil sheens continued to be spotted on the river's surface, as do 'bio sheens,' which look like oil sheens but only contain biological, natural organic matter from leaves and other decomposing vegetation.

The oil company's contractor collected samples from both contaminated and non-contamianted areas using sheen nets.  The nets were extracted in solvent and analyzed by Sitelab's laboratory for their GRO, DRO and PAH concentrations using the UVF-3100D and TD-500D analyzers together, as part of Sitelab's unique TPH fingerprinting method.  The oil sheen nets fluoresced similar to each other, while the bio sheen nets came up clean and non-detect.  Knowing the difference between the two will help improve monitoring and cleanup efforts.

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