The concept presented in the current guidance document consists of two major routes:
- responding to the requirements for determination of PAHs, heavy metals and mycotoxins.
- corresponding to PCDD/F and PCB analysis, where results are calculated as sumparameters and expressed in toxic equivalents (TEQs), converting thereby congener concentrations together with estimated LOQs using toxic equivalency factor (TEFs) into TEQs. Due to the nature of this more complex procedure, emphasis is put in the area of PCDD/F and PCB analysis on the LOQs, while LODs are of minor consequence.
Since the nomination of new EURLs in the field of contaminants in 2018, an updated version of this guidance document focussing on one central approach for LOQs in all fields without legal requirements, is in preparation.