Extension and new “combo” packages for TOP in water and soil
TOP (total oxidizable precursors) is a method that can be used to “reveal” PFAS precursors. Precursors are PFAS compounds, known or unknown, that may degrade into, typically, perfluorinated sulphonates (PFSA) and carboxylic acids (PFCA) as final products. When applying TOP, precursors are chemically oxidized into PFCAs. The concentrations and pattern of PFCAs formed will give both quantitative and qualitative information of what precursors that were present in the sample. Eurofins has offered the method since 2017. We are now extending some of our packs for water and soil/sediment to include all 20 PFAS that are part of the EU drinking water directive (DWD; (EU) 2020/2184) as well as the Swedish (6:2 FTS) and Danish (6:2 FTS + PFOSA) additions. The extended TOP packages will then match the regular “non-oxidized” PFAS28 and 35 packages (see table). The additions will not imply any changes to price, delivery time (TAT), sample amount etc.
| Matrix | PFAS range | TOP code | Additions TOP | Regular PFAS code |
| Water | PFAS28 | PLWHM | PFPeS, PFNS, PFDoS, PFTrDS, PFUnDS, PFTrDA | PLWFK (clean) PLW9M (unclean) |
| PFAS35 | PLWLU | PFPeS, PFNS, PFDoS, PFTrDS, PFUnDS | PLWAF (clean) PLWXZ (unclean) |
|
| Soil/sediment | PFAS28 | PLWNM | PFPeS, PFNS, PFDoS, PFTrDS, PFUnDS PFTrDA | PLW6Q (soil) PLWBC (sediment) |
| PFAS35 | PLWRI | PFPeS, PFNS, PFDoS, PFTrDS, PFUnDS | PLWN0 (soil) PLWBE (sediment) |
Besides the additions to existing packages we will also introduce new “combo” packs containing both the regular (non-oxidized/pre-TOP) and the TOP (oxidized) compounds.
| Matrix | PFAS range | New combo packages |
| Water | PFAS28 | PLWBH (clean) PLWBK (unclean) |
| PFAS35 | PLWBJ (clean) PLWBL (unclean) |
|
| Soil/sediment | PFAS28 | PLWBM (soil) PLWBP (sediment) |
| PFAS35 | PLWBN (soil) PLWBQ (sediment) |
More information on precursors and TOP can be found in our “short facts” paper that can be found at our publications page (link below). Further information on the updated and new packages can be found in our online catalogue.
Questions about PFAS can be answered by our analytical advisory service, which can be reached via the customer support, 010-490 8110 or e-mail: sh-analys.miljo.se@etn.eurofins.com