Division 2 Identification and confirmation of analytes of interest:

Relative retention time in relation to internal standards or reference standards (acceptable deviation of +/– 0,25 %).

Gas chromatographic separation of the non-dioxin-like PCBs (from interfering substances, especially co-eluting PCBs, in particular if levels of samples are in the range of legal limits and non-compliance is to be confirmed^f1).

For GC-MS techniques:

• Monitoring of at least the following number of molecular ions or characteristic ions from the molecular cluster:

  • two specific ions for HRMS,

  • three specific ions for LRMS,

  • two specific precursor ions, each with one specific corresponding transition product ion for MS-MS.

• Maximum permitted tolerances for abundance ratios for selected mass fragments:

  Relative deviation of abundance ratio of selected mass fragments from theoretical abundance or calibration standard for target ion (most abundant ion monitored) and qualifier ion(s): ± 15 %.

For GC-ECD:

Confirmation of results exceeding the maximum level with two GC columns with stationary phases of different polarity.