Defluorination and derivatization of fluoropolymers for determination of total organic fluorine in polyolefin resins by gas chromatography
Why this work is in the frame
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Bibliographic record
Abstract
= 7). The detection limit is 0.48 ppm w/w fluorine in tetrahydrofuran, equivalent to 9.6 ppm w/w of fluorine in a polymer sample with a sample concentration of 5 wt% polyethylene in tetrahydrofuran. Method validation was conducted using real polyethylene resins with varying fluorine levels, and the results were compared to those from two other analytical techniques: neutron activation analysis and combustion ion chromatography. While the results are generally close, some discrepancies were observed, likely due to sample heterogeneity and sample size differences. Spike recovery studies revealed good accuracy, with recoveries ranging from 90.5 to 97.8%. Cryogenic grinding of pellets into powder helps mitigate the sample homogeneity issue, providing more reproducible results. Given the widespread availability of gas chromatographs in most analytical laboratories, this method provides a practical, efficient, and cost-effective solution for determining extractable total organic fluorine in polyethylene resins and can be used for rapid screening and sample prioritization.
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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 | 0.001 |
| 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 it