Serum PFAS mixes reveal seafood vs product exposure
Long-chain PFCAs mark seafood/whale diets, while PFHxS and N-EtFOSAA mark carpets and consumer products in children.
Source
Can profiles of poly- and Perfluoroalkyl substances (PFASs) in human serum provide information on major exposure sources?
What they did
Authors compared 15 PFASs in Faroese children, women, and whalers, ran PCA/clustering, and modeled NHANES 2005–06 and CHirP predictors such as seafood, carpets, and drinking water.
What they found
Whalers’ profiles were ~80% PFOS and separated on PC1 (51% of variance). Children had higher PFHxS and N-EtFOSAA. Hair mercury correlated with PFHpS, PFDA, PFOS, and PFUnDA (ρ 0.35–0.61). Carpets raised PFHxS 37.2% in NHANES. Seafood tracked PFNA in both US cohorts.
The limits
What it doesn't show
NHANES models explained only 9–25% of PFAS variance. Toxicokinetics and time trends can mimic source differences. CHirP detected only four PFASs in >50% of people.
Key terms
- PFAS profile
- The relative mix of PFAS compounds in serum, used here as a source fingerprint.
- N-EtFOSAA / PFHxS
- Compounds elevated in Faroese children and linked to carpets/consumer products in NHANES.
- C9–C12 PFCAs
- Long-chain carboxylates that track seafood in coastal populations.
- PCA
- Principal component analysis of serum composition; first three axes explained 77% of PFAS variability.
- Hair mercury
- A seafood-intake proxy that correlated with several PFAS in Faroese children.
Flashcards
Research intelligence for this paper
See its role on concept claims, tensions it is part of, placement history, and related discoveries.
Quiz yourself
Whalers’ serum PFAS mix was dominated by:
Common questions
Can PFOS or PFOA alone identify the source?
No. They are too ubiquitous; rarer compounds and ratios are the tracers.
What marks whale/seafood diets?
High PFOS share plus long-chain PFCAs; hair mercury tracks several of those PFASs.
What marks indoor products?
Elevated PFHxS and N-EtFOSAA, plus carpet coverage in NHANES.
Why measure more than five PFASs?
Routine five-compound panels miss the source-informative minor compounds.
More on Persistent pollutants