SPECTROPHOTOMETRIC DETERMINATION OF ARSENIC, LEAD IN ENVIRONMENTAL AND BIOLOGICAL SAMPLES USING 2, 5THIOPHENE DICARBOXALDEHYDE, THIOSEMICARBAZONE
Bibliographic record
Abstract
Analytical application of 2,5‐thiophene dicarboxaldehyde, thiosemicarbazone(TDATSC) is described for the direct non‐extractivespectrophotometric determination of AsIII, and PbII in aqueous environmental and biological samples .The reagents react with arsenic, in acidic medium (pH 6.0., sodium acetate‐acetic acid buffer) to form light yellow colored, 2:1 (M: L) complexes. The reagents react with lead in basic medium (pH 9.0. buffer) to form light blue colored, 2:1 (M: L) complexes. The colour reactions are instantaneous and absorbance values remain constant for over 24 h. The molar absorptivity and Sandell’s sensitivity of TDATSC methods are found to be 1.45 X 10 4 L mol‐1 cm‐1 and 0.0014 µg cm‐2 of AsIII, of. 1.89 X 10 4 L mol‐1 cm‐1 and 0.0019 µg cm‐2 of PbII respectively. The systems obey Beer’s law in the range of 0.123‐2.537 µg/ml of AsIII, 2.0− 2.4 µg/ml of PbII .Since TDATSC method is more sensitive it was applied for the determination of Arsenic, lead in environmental and biological 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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".