Bibliographic record
Abstract
The Henry's law solubility (HS) and liquid-phase loss rate constants (kl) of the tropospheric trace gas constituents peroxyacetic nitric anhydride (PAN, CH3C(O)O2NO2; commonly known as peroxyacetyl nitrate) and peroxypropionic nitric anhydride (PPN, C2H5C(O)O2NO2; also known as peroxypropionyl nitrate) in deionized (DI) water and of PPN in n-octanol were measured using a flow bubble apparatus at temperatures between 5.0 °C and 25.0 °C. For PAN in DI water, the observed values for HS,aq are consistent with literature, whereas the solubility of PPN in DI water is slightly lower than literature values, ranging from HSCP (PNN)aq = (1.49±0.05) M atm-1 at 25.0 °C to HSCP (PNN)aq = (7.01±0.25) M atm-1 at 5.0 °C (stated uncertainties are at the 1σ level). The data are best described by ln(HSCP (PAN)aq/[M atm-1]) = -(17.8±0.3) + (5620±85)/T and ln(HSCP (PNN)aq/[M atm-1]) = -(19.5±1.7) + (5955±480)/T , where T is in Kelvin. For n-octanol, the PPN solubility ranges from HSCP (PNN)oct = (88±5) M atm-1 at 25.0 °C to HSCPoct = (204±16) M atm-1 at 5.0 °C and is best described by ln(HSCP (PNN)oct/[M atm-1]) = -(6.92±0.75) + (3390±320)/T. n-Octanol-water partition coefficients (KOW) for PPN were determined for the first time, ranging from 59±4 at 25.0 °C to 29±3 at 5.0 °C. Observed loss rate constants in DI water are consistent with recent literature and larger than the thermal dissociation rates for both PAN and PPN, consistent with a hydrolysis mechanism, whereas kl values in n-octanol are significantly smaller than gas-phase dissociation rate constants, likely owing to a "cage effect" in the organic liquid. The results imply that uptake of either PAN or PPN on cloud water and organic aerosol is negligible but that uptake of PPN may constitute an overlooked source of peroxy radicals in organic aerosol.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.177 | 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".