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?
Study at a glance
- Design
- Cross-sectional — Serum PFAS profiles with PCA/clustering in Faroese groups and predictor models in NHANES/CHirP
- N
- N=2120 · NHANES 2005–06 n = 2,120; Faroe children n = 52, women n = 52, whalers n = 10; CHirP n = 151; NHANES 2011–12 n = 1,751
- Population
- Faroese children, women, and whalers plus US NHANES and CHirP participants
- Outcome
- Long-chain PFCAs mark seafood/whale diets, while PFHxS and N-EtFOSAA mark carpets and consumer products in children
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Inspect source passages
Serum PFAS mixes reveal seafood vs product exposure
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
First three PCA components explain 77% of serum PFAS variability
The first three components of the PCA explain 77% of the total variability in serum PFAS concentrations (Fig.
First PCA component explains 51% of the variability
The first PCA component explains 51% of the variability, and clearly separates whaling men from children and women.
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.
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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.
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