Monitoring of chlorinated hydrocarbon compounds residues in surface water and bed sediment samples from El-Rahawy drain, Egypt
Bibliographic record
Abstract
The concentrations of organochlorine pesticides and polychlorinated biphenyls were determined in surface water and bed sediments from El Rahawy drain in the southwestern part of Nile Delta. Results obtained show that the concentration of:LDDT compounds in surface water range from 0.008 to 0.239 μ L−1 and from 0.011 to 3.10 μ kg−1(dry weight) in bed sediments during wet and dry seasons. Hexachlocyclohexanes (HCHs) have also been widely used in the region but the current environmental concentrations are slightly higher than those of DDT's, which is due to the less persistence of those compounds. Cyclodienes (Cds) were measured, for example as endosulfan II, in concentrations range from 0.021 to 0.823 μ L−1 and 0.09 to 1.73 μ kg−1 (dry weight) in surface water and bed sediments, respectively. Polychlorinated biphenyls including Aroclors 1016, 1221, 1232, 1242, 1248, 1254, and 1260 were not detected in any of surface water and bed sediments samples due to low funding limitations. The investigation of chlorinated hydrocarbon compounds in the surface water and sediments are still within safety margins compared to Canadian guidelines.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".