Utilization of 2-Nitro-6-(thiazol-2-yldiazenyl)phenol for Spectrophotometric Determination of Trace Amounts of Copper(II) in Water Samples
Bibliographic record
Abstract
A simple ultra sensitive and fairly selective non extractive spectrophotometric method for the determination of copper using 2-nitro-6-(thiazol-2-yldiazenyl) phenol (NTDP) has been developed.. The method is based on the color reaction of copper with NTDP at pH 7.1 buffer. The optimal reaction conditions (e.g., reagent concentration, pH and effect of time and temperature) were studied and the analytical characteristics of the method (e.g., limit of detection, limit of quantification, and linear ranges) were obtained. Linearity was obeyed in the range of 0.1-5.0 µg/mL of copper(II) ion and the detection limit of the method was 3.0 ng/mL. The relative standard deviation (RSD) and relative error for six replicate measurements of 2.0 µg/mL Cu(II) were 0.76 % and 1.34 %, respectively. The interference effect of some anions and cations was also tested. The method was applied to the determination of copper(II) in water samples.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".