Chlorinated Diphenyl Ethers in Sediments, Biota, and the Water Column from Coastal British Columbia, Canada
Bibliographic record
Abstract
Abstract Polychlorinated diphenyl ethers (PCDEs) are impurities in technical chlorophenol mixtures, are used as dielectric fluids in capacitors and as herbicides, antiseptics, food preservatives, and papers and textiles, and can be formed through the chlorination of organics in water and wastewater streams. Samples from semipermeable membrane devices (SPMDs), sediments, English sole, mussels, and Dungeness crab were collected from urban/industrial and remote sites along the marine coast of British Columbia and analyzed by congener-specific GC-MS analysis for mono- through deca-substituted PCDEs. Higher concentrations in biota and sediments were observed near urban/industrial areas, with evidence for food-chain biomagnification within major harbours. Correlations between size distributions and PCDE levels indicate these hydrophobic contaminants tend to preferentially partition into sediments with higher clay/silt fractions. Multivariate analysis of congener patterns shows distinct PCDE profiles among different species and environmental matrices, and evidence for favoured dechlorination pathways among the most commonly observed congeners in aquatic systems.
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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 | 0.001 | 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.004 | 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".