Aerobic Biodegradation of Two Commercial Naphthenic Acids Preparations
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Naphthenic acids (NAs) have a variety of commercial uses including as emulsifiers and wood preservatives. They have been identified as being the main component responsible for the acute toxicity in produced waters in the oil sands operations in northeastern Alberta, Canada. NAs comprise a complex mixture of alkyl-substituted acyclic and cycloaliphatic carboxylic acids, with the general chemical formula CnH(2n+Z)O2, where n indicates the carbon number and Z specifies hydrogen deficiency from ring formation. In this study, commercial preparations of NAs were shown to be degraded in aerobic cultures from oil sands process-affected waters. High-performance liquid chromatography and gas chromatography-mass spectrometry (GC-MS) were used to monitor the concentrations and composition of the NA mixtures during biodegradation. Within 10 days of incubation, the NAs concentrations dropped from about 100 to <10 mg/L. This was accompanied by the release of about 60% of carbon from the NAs as CO2 and the reduction of toxicity of the culture supernatant, as measured by the Microtox assay. GC-MS results demonstrated that biodegradation changes the composition of the complex mixture of these NAs and that the lower molecular weight acids (with n = 5-13) were degraded more readily than the high molecular weight acids.
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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 | 0.000 | 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 | 0.002 |
| 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