Distribution and potential health risks of perfluoroalkyl substances (PFAS) in dairy and egg products in Guangzhou
Bibliographic record
Abstract
Poly- and perfluoroalkyl substances (PFAS) are widely studied for their potential toxicity and environmental prevalence. In Guangzhou, South China, PFAS research has focused mainly on environmental samples and aquatic products, with limited data on contamination in commercial foods. This study measured PFAS levels in 104 food products sold in Guangzhou—59 dairy and 45 egg products—using isotope dilution LC-MS/MS. Dietary exposure and health risks were assessed for three age groups: 3–6 years, 7–19 years, and adults. Perfluorooctane sulfonate (PFOS; 6.7%, ND–1.51 ng/g) and perfluorooctanoic acid (PFOA; 3.3%, ND–1.72 ng/g) were detected only in hen eggs. Perfluorononanoic acid (PFNA) appeared in 79.3% of pasteurized milk (ND–0.83 ng/mL) and 100% of fermented milk (0.16–0.49 ng/mL). Perfluorobutanesulfonic acid (PFBS) was the dominant compound in egg products, found in 83.3% of hen eggs (ND–0.83 ng/g) and 93.3% of quail eggs (ND–0.43 ng/g). Health risk assessments indicate no risk from consuming these dairy and egg products for the general population, though children showed higher exposure to PFDS from fermented milk (hazard quotient 0.849). This first age-specific risk assessment of PFAS in local foods provides essential data to guide region-specific dietary safety standards.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".