Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:8440
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 8440
Character Range: 796708–798779

8440    TRPs by infrared spectrophotometry

10.1          Volatile organics

    10.1.1     Scope and application
Unless indicated otherwise, the methods described in this section are contained in SW-846. This section lists methods for the following classes of volatile compounds:
    MAH
    VHC
    miscellaneous volatile organic compounds
    volatile TRH.

    10.1.2     Monocyclic aromatic hydrocarbons
This method is applicable to most volatile compounds with boiling points less than 200°C and which are insoluble or only slightly soluble in water, including (but not limited to):

    benzene      ethyl benzene
    toluene      xylenes
    styrene (vinyl benzene, ethenylbenzene)  propyl benzene
    trimethylbenzenes     cumene

10.1.2.1     Preliminary screening
Preliminary screening by headspace analysis (Method 5021) or hexadecane extraction (Method 3820) is appropriate for samples that may contain high concentrations.

Note 1: Headspace analysis may not be as rigorous or reliable as purge and trap (Method 5035) though  it is suitable as a 'screening analysis'.

Note 2: Flame ionisation detection (FID) may be substituted for MS or PI detection, for screening purposes but FID is more susceptible to interference and erroneous quantification due to its non-specific response. Accordingly, residues should be confirmed by chromatography on a stationary phase of different polarity or by measurement using MS or PI detector.

10.1.2.2     Sample extraction
Low concentration: (approx <200 μg/kg, for individual compounds)
    * purge and trap technique (Method 5035, Method 5030B)
Analysts should determine an appropriate concentration limit and ensure that quantitative results are based on sample concentrations that do not exceed the instrumental range.

High concentration: (≥200 μg/kg, for individual compounds)
    * methanol extraction followed by purge and trap technique (Method 5035 or 5030B).

10.1.2.3     Sample clean-up
Not applicable.

10.1.2.4     Sample analysis
The table below lists the US EPA SW-846 methods specified for MAHs.