EPA Method 8272

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EPA Method 8272:
PARENT AND ALKYL POLYCYCLIC AROMATICS IN SEDIMENT PORE WATER BY SOLID-PHASE MICROEXTRACTION AND GAS CHROMATOGRAPHY/MASS SPECTROMETRY IN SELECTED ION MONITORING MODE

Summary:
The U.S. Environmental Protection Agency (USEPA) narcosis model for benthic organisms in sediments contaminated with polycyclic aromatic hydrocarbons (PAHs) is based on the concentrations of dissolved PAHs in the interstitial water or pore water in sediment. Method 8272 covers the separation of pore water from PAH-impacted sediment samples, the removal of colloids, and the subsequent measurement of dissolved concentrations of the 10-parent PAHs and two alkylated daughter PAHs in the pore water samples. This method directly determines the concentrations of dissolved PAHs in environmental sediment pore water, groundwater, and other water samples.

Scope:
Pore water is separated from wet sediment samples by centrifugation and supernatant collection. The groundwater and tap water samples begin preparation with the colloid removal step. Colloids are removed from the separated pore water, groundwater, and tap water samples by flocculation with aluminum potassium sulfate (alum) and sodium hydroxide. A second flocculation and centrifugation step, followed by supernatant collection, completes the colloid removal.