Pollution Status of Metals in Sediments from Ikere, Iseyin, Opeki, Ofiki and Igangan Sections of the Ogun River Basin
Bibliographic record
Abstract
Sediments were obtained from sections of the Ogun River namely Ikere, Iseyin, Opeki, Ofiki and Igangan. Layers of sediment ranging from 0-5cm, 5-10cm and 10-15cm were obtained after which they were air dried, pulverized and sieved using a 2mm sieve to obtain very fine grain particles for analysis. The sediments were then subjected to physicochemical analysis in which pH and conductivity were determined using standard methods by the American Public Health Association of 1992 while Organic Carbon was determined by Wakley Method. For the sediment metal analysis, sediments were subjected to the Induced Couple Plasma/Mass Spectrometer (ICP/MS) analysis. Results obtained were then used for the calculation of the Geochemical Pollution Intensity (Igeo). Metal results obtained showed that all metals had concentrations lower than Environment Canada Sediment Quality Guideline standards of 35.70ppm, 35.00ppm, 0.60ppm, 123.00ppm, 5.90 ppm, 0.17ppm and 37.50ppm for Cu, Pb, As, Zn, Hg, Cd, and Cr respectively except that of Pb obtained from Opeki 0-5cm with value of 80.80ppm which was higher than the 35.00 ppm standard limit. Thus, this sediment layer requires frequent monitoring as toxic levels of Pb can be harmful to sediment/aquatic species. All Igeo values showed unpolluted status for the metals analyzed.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.004 |
| 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".