Atmospheric Chemistry of 4:2 Fluorotelomer Alcohol (CF<sub>3</sub>(CF<sub>2</sub>)<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>OH): Products and Mechanism of Cl Atom Initiated Oxidation
Bibliographic record
Abstract
Smog chamber/FTIR techniques were used to study the products and mechanism of the Cl atom initiated oxidation of 4:2 fluorotelomer alcohol (CF 3 (CF 2 ) 3 CH 2 CH 2 OH) in 700 Torr of N 2 /O 2 diluent at 296 K. CF 3 (CF 2 ) 3 CH 2 CHO is the sole primary oxidation product. CF 3 (CF 2 ) 3 CHO, CF 3 (CF 2 ) 3 CH 2 COOH, and CF 3 (CF 2 ) 3 CH 2 C(O)OOH are secondary oxidation products. Further irradiation results in the formation of CF 3 (CF 2 ) 3 COOH, COF 2, and CF 3 OH. CF 3 (CF 2 ) 3 CHO, CF 3 (CF 2 ) 3 CH 2 COOH, and CF 3 (CF 2 ) 3 CH 2 C(O)OOH are formed from CF 3 (CF 2 ) 3 CH 2 CHO oxidation in yields of 46%, 27%, and ≤27%, respectively. Using relative rate techniques, a value of k (Cl + CF 3 (CF 2 ) 3 CH 2 CHO) = (1.84 ± 0.30) × 10 -11 cm 3 molecule -1 s -1 was determined. The yield of the perfluorinated acid, CF 3 (CF 2 ) 3 COOH, from the 4:2 fluorotelomer alcohol increased with the diluent gas oxygen concentration. For the experimental conditions used herein and employing >98% consumption of 4:2 fluorotelomer alcohol, the molar yields of CF 3 (CF 2 ) 3 COOH were <0.011, 0.031, 0.042, and 0.056 in experiments conducted with 10, 140, 400, and 700 Torr O 2, respectively. These results suggest that the atmospheric oxidation of fluorotelomer alcohols may be a significant source of the perfluorinated carboxylic acids that are observed in remote areas.
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.003 |
| 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; both teacher heads agree on what is shown here.
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".