Antioxidant depletion in high-density polyethylene pipes exposed to synthetic leachate and air
Bibliographic record
Abstract
ABSTRACT: Antioxidant depletion rates are reported for samples of one particular high-density polyethylene pipe when immersed in air and a synthetic municipal solid waste leachate, obtained by measuring the oxidative induction time (OIT) at temperatures of 22°C, 40°C, 70°C and 85°C with time. Of the factors examined, the rate of antioxidant depletion was affected most by the ageing temperature, with much faster depletion occurring at higher temperatures. Antioxidant depletion was faster when immersed in the synthetic leachate rather than in air, and faster for the thin pipe examined compared with a thick pipe. No significant difference in antioxidant depletion was found whether the pipe was deflected with a 10% reduction in vertical outside pipe diameter or not deflected. Predictions of the time to deplete antioxidants are then made from Arrhenius extrapolations of the reported data. It is estimated that depletion of antioxidants may take from as long as 600 years at 10°C to as little as 20 years at 50°C when exposed to air, and may reduce to 160 years at 10°C or 10 years at 50°C if exposed to the synthetic leachate. These results are applicable for the particular pipe, antioxidant formulation and conditions examined.
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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 | 0.000 | 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".