A survey of PBDEs in recycled carpet padding
Bibliographic record
Abstract
Polyurethane foam containing brominated flame retardants is recycled in some countries to make products such as foam padding for carpets (known as rebond). The Stockholm Convention Persistent Organic Pollutants (POPs) Review Committee raised concerns about the practice since brominated flame retardants listed in the treaty could be carried over and diluted into the recycled products contributing to further human and environmental exposure. Recycled foam carpet padding from Canada, Hungary, Kyrgyzstan, Nepal, Thailand, and USA was screened using handheld XRF for bromine and analyzed in the laboratory for polybromodiphenyl ethers (PBDEs). Bromine was not detected at significant levels in samples from Nepal, Kyrgyzstan, and Thailand. Laboratory analysis of 26 samples from Canada, Hungary, and USA found that twenty-three samples contained at least one PBDE listed in the Stockholm Convention (88%) with levels ranging from 1 – 1130 ppm. The results raise concerns about recycling materials containing flame retardants which results in worker and consumer exposure to substances listed in the Stockholm Convention for global elimination, particularly for children crawling on carpeted floors. To our knowledge, this is the first publically available investigation of PBDEs in carpet foams which may contain recycled materials.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".