Fig. 2

Concentrations of PFCA homologues and PFOS from a contaminated soil sample measured before and after in-house TOP assay protocols in an interlaboratory test with five contributing laboratories (L1–L5)
Concentrations of PFCA homologues and PFOS from a contaminated soil sample measured before and after in-house TOP assay protocols in an interlaboratory test with five contributing laboratories (L1–L5)