Phosphorus release from sediments in hardwater eutrophic lakes: the effects of redox‐sensitive and ‐insensitive chemical treatments
Bibliographic record
Abstract
1. Phosphorus (P) release from bottom sediments is an important source of nutrient enrichment in many lakes in sedimentary basins, such as those in western Canada. On the Boreal Plain, sediment P release is particularly strong during periods of seasonal anoxia. 2. In this study, the effects of reduction–oxidation (redox)‐sensitive and ‐insensitive chemicals on P release were examined in sediment cores collected from three eutrophic lakes. 3. Contrary to expectations, redox‐sensitive treatments were no more effective at lowering total phosphorus (TP) in sediment cores than some redox‐insensitive treatments. Redox‐sensitive treatments with FeCl 3 and FeCl 3 + O 2 reduced TP to 8 and 6%, respectively, of reference concentrations, whereas redox‐insensitive treatments with alum or lime + alum reduced TP to 14% of reference concentrations. Lime and O 2 treatments reduced TP concentrations to 35 and 52% of reference concentrations, respectively. 4. The fraction of P that adsorbed and co‐precipitated with iron and aluminium in the sediment cores was low (non‐apatite phosphorus fractions < 5%), suggesting that P release was controlled by apatite solubility and bacterial metabolism.
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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 | 0.000 |
| 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 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".