EPA Method 3562

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EPA Method 3562:
SUPERCRITICAL FLUID EXTRACTION OF POLYCHLORINATED BIPHENYLS (PCBs) AND ORGANOCHLORINE PESTICIDES

Summary:
In order to assure a homogeneous sample and minimum subsampling errors, at least 100 g of sample are homogenized with an equal volume of solid CO2 "snow." An aliquot of this mixture is packed into a stainless steel SFE extraction vessel. Copper powder may be added to the cell to remove sulfur from the sample extract. Surrogates and/or internal standards are added to the portion of the sample in the cell and the cell is placed in the SFE extraction device.

Scope:
This method describes the use of supercritical fluids for the extraction of polychlorinated biphenyls (PCBs) and organochlorine pesticides (OCPs) from soils, sediments, fly ash, solid-phase extraction media, and other solid materials which are amenable to extraction with conventional solvents. This method is suitable for use with any supercritical fluid extraction (SFE) system that allows extraction conditions (e.g., pressure, temperature, flow rate) to be adjusted to achieve separation of the PCBs and OCPs from the matrices of concern.

Report Number:
SW-846 Ch 4.2.1