Zinc Isotope Fractionation as an Indicator of Geochemical Attenuation Processes
Why this work is in the frame
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Bibliographic record
Abstract
Isotope ratio measurements have been used to trace environmental processes, especially in subsurface environments. In this study, we evaluated the potential to use zinc (Zn) stable isotope ratios as indicators of attenuation processes, including sorption and precipitation. Zn isotope fractionation was observed during distinctly different precipitation processes. Isotope measurements confirmed an increasing trend in aqueous δ66Zn in solution during sphalerite (ZnS) formation, but a decreasing trend in δ66Zn during the precipitation of hydrozincite [Zn5(CO3)2(OH)6] and hopeite [Zn3(PO4)2·4H2O]. In contrast, time-dependent sorption of Zn onto ferrihydrite at a fixed pH did not cause isotopic fractionation in the solution over the duration of the experiments. These findings suggest potential applications of stable isotope measurements in aqueous environments for determining reaction pathways (e.g., precipitation with common groundwater constituents) leading to Zn attenuation.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 it