Vibrational spectroscopy study of hydrothermally produced scorodite (FeAsO<sub>4</sub>·2H<sub>2</sub>O), ferric arsenate sub‐hydrate (FAsH; FeAsO<sub>4</sub>·0.75H<sub>2</sub>O) and basic ferric arsenate sulfate (BFAS; Fe[(AsO<sub>4</sub>)<sub>1−<i>x</i></sub>(SO<sub>4</sub>)<sub><i>x</i></sub>(OH)<sub><i>x</i></sub>]·<i>w</i>H<sub>2</sub>O)
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Bibliographic record
Abstract
Abstract Three crystalline ferric arsenate phases: (1) scorodite; FeAsO 4 ·2H 2 O, (2) ferric arsenate sub‐hydrate (FAsH; FeAsO 4 ·0.75H 2 O) and (3) basic ferric arsenate sulfate (BFAS; Fe[(AsO 4 ) 1− x (SO 4 ) x (OH) x ]· w H 2 O) synthesized by hydrothermal precipitation (175–225 °C) from Fe(III)‐AsO 4 3− –SO 4 2− solutions have been investigated via Raman and infrared spectroscopies. The spectroscopic nature of these high‐temperature Fe(III)‐ AsO 4 3− –SO 4 2− phases has not been extensively studied despite their importance to the hydrometallurgical industrial processing of precious metal (Au and Cu) arsenic sulfidic ores. It was found that scorodite, FAsH and BFAS all gave rise to very distinct arsenate, sulfate and hydroxyl vibrations. In scorodite and FAsH, the distribution of the internal arsenate modes was found to be distinct, with the factor effect being more predominant in the crystal system. For the crystallographically unknown BFAS phase, vibrational spectroscopy was used to monitor the arsenate ↔ sulfate solid solution behavior that occurs in this phase where the molecular symmetry of arsenate and sulfate in the crystal structure is reduced from an ideal T d to a distorted T d or C 2 / C 2 v symmetry. With the new collected vibrational data of the pure phases, the use of attenuated total reflectance infrared (ATR‐IR) spectroscopy was finally extended to investigate the nature of the arsenate in an industrial residue generated by pressure oxidation of a gold ore, where it was found that the arsenate was present in the form of BFAS. Copyright © 2009 John Wiley & Sons, Ltd.
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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 | 0.012 | 0.002 |
| Meta-epidemiology (narrow) | 0.012 | 0.013 |
| Meta-epidemiology (broad) | 0.012 | 0.006 |
| Bibliometrics | 0.007 | 0.013 |
| Science and technology studies | 0.007 | 0.006 |
| Scholarly communication | 0.005 | 0.012 |
| Open science | 0.008 | 0.004 |
| Research integrity | 0.005 | 0.013 |
| Insufficient payload (model declined to judge) | 0.000 | 0.004 |
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 it