An Alumina-based Method for the Preconcentration of Pd, Pt, and Au Determined by Flow Injection-ICPMS: A Fast and Accessible Approach
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Bibliographic record
Abstract
A method for the preconcentration and determination of Pd, Pt, and Au in ore was developed.A basic alumina sorbent with an 0.01 M HCl conditioning wash was used for the retention of chloro-complexed noble metals, which were then eluted with a 3% thiourea and a 10% aqua regia mixture.Flow injection was used for introduction of eluates into inductively coupled plasma mass spectrometry to effectively mitigate signal drift typically caused by thiourea with direct nebulization.Using this method, complete recovery (i.e. a 25-fold preconcentration) was achieved for Pd and Pt with an 8-fold recovery for Au and effective removal of matrix interferences.The method was validated using CDN-PGMS-29 ore reference material: agreement with certified concentrations of Pd, Pt and Au was achieved based on a Student's t-test at the 95% confidence level.This simple, low-cost method enables efficient preconcentration of Pd, Pt and Au, making it well suited for trace determination of Pt, Pd and Au for geological applications.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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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