The Aqueous Photolysis of TFM and Related Trifluoromethylphenols. An Alternate Source of Trifluoroacetic Acid in the Environment
Bibliographic record
Abstract
The lampricide 3-trifluoromethyl-4-nitrophenol (TFM) is added annually to the Great Lakes (approximately 50 000 kg/y), with treatment concentrations varying from 1 to 14 mg/L at source. TFM was shown to undergo photohydrolytic degradation, at 365 nm and under actinic radiation, to produce trifluoroacetic acid (TFA). A mechanistic study for the production of TFA from TFM was conducted, and the structural parameters associated with the production of TFA from trifluoromethylated phenols were investigated. It was found that the yield of TFA is clearly dependent on the nature of the trifluoromethylated phenol. The nature of the substituents, the substitution pattern, and the pH strongly effected the photolytic half-life of the parent compound and the yield of TFA. The half-life of TFM at 365 nm was found to be 22 h (pH 9) and yielded 5.1% TFA, and 91.7 h at pH 7, yielding 17.8% TFA. Converting the nitro substituent of TFM to an amino group caused a decrease in the half-life to 2.3 min and yielded 11% TFA. The mechanism for the production of TFA from TFM was deduced from the pH dependence and the effect of altering substituents on the trifluoromethylphenol. Ultimately, the formation of trifluoromethylquinone led to the quantitative production of TFA.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.009 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".