Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:3561
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 3561
Character Range: 809256–809966

3561  SFE of PAHs

10.2.4.1     Sample extraction
The tables below list the specified US EPA SW-846 methods. The extraction is a three-step process using:
    supercritical CO2
    supercritical CO2 plus water and methanol modifiers
    supercritical CO2 (to purge system of modifiers).

Collection of SFE extract:
either
    octadecylsilyl (ODS) trap with elution of trap using:
         a. acetonitrile/tetrahydrofuran (50/50) for HPLC determination, or
         b. DCM (dichloromethane)/isooctane (75/25)

or
    solvent trapping in solvent system (a) or (b) above, or another system validated by the laboratory.

10.2.4.2     Extract clean-up
The table below lists the specified US EPA SW-846 methods.