Electrolytic treatment of azo dyes containing o,o′-dihydroxyazo complexation sites
Bibliographic record
Abstract
The impact of structure on decolorization rate was studied for two azo dyes containing the o,o′-dihydroxyazo complexation site, Direct Red 83 and Acid Alizarin Violet N. Both dyes were investigated with and without complexed copper; the methoxylated pre-cursor of Direct Red 83 was also investigated. The dye solutions were electrolytically treated and sample conductivity, pH, and temperature were measured before and after each 60-min run. The UV–VIS absorbance spectra of samples were measured at 10 min intervals with and without quenching of chlorine residuals with sodium thiosulfate. The decolorization rate data calculated from the absorbance spectra were plotted as fraction of dye remaining, Ct/C0, versus time, t, in seconds. First-order curves were fitted to the data, and the apparent first-order rate constant, k, was calculated for each dye. In general, the Acid Alizarin Violet N forms were decolorized more rapidly than the Direct Red 83 forms, the presence of copper protected the dyes from the continuation of indirect oxidation, and methoxylation reduced the first-order rate constant, but it did not protect the azo bond from continued indirect oxidation as was the case with copper. Key words: azo dye, structure, electrolytic treatment, electrochemical, color, decolorization, rate constant.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".