Biodegradation of 3,3′-dichlorobenzidine in freshwater lake sediments
Bibliographic record
Abstract
3,3′-Dichlorobenzidine (DCB) and its degradation products, 3-chlorobenzidine (MCB) and benzidine, are of environmental concern due to their toxic and carcinogenic nature. Laboratory experiments have been conducted to elucidate the biodegradation behavior of DCB in Lake Macatawa (Holland, Michigan) sediment–water systems at 4, 24, and 30 °C incubation temperatures. Sediment samples varied in pH (6.45–7.41), total organic carbon (OC) content (1.4–17.1), and particle size distribution (silty-clay to sandy). Biodegradation of DCB was observed in non-autoclaved samples that were incubated at 4, 24, and 30 °C for approximately 12 months. The dechlorination rate as a function of OC content was essentially found constant at 4 °C and 24 °C, but demonstrated a roughly linear increase at 30 °C, thereby suggesting that OC content might be correlated to dechlorination rate at 30 °C incubation temperature. The rate as a function of particle size (e.g., <74 µm) did not demonstrate a clearly defined relationship. Key words: 3,3′-dichlorobenzidine, 3-chlorobenzidine, benzidine, biodegradation.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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 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".