Abstract: Heavy metal uptake and translocation in Salix (willow): potential as a phyto-remediation agent
Bibliographic record
Abstract
Salix eriocephala (black diamond willow) and Salix petiolaris (slender willow) were grown from strikings for approximately six months, and then subjected to fi ve aqueous treatment levels of thirteen heavy metals (Cu, Pb, Zn, Mo, Ag, Ni, Co, Cr, As Sb, Cd, Se, Hg; primarily as acetate salts) for three months to assess the level of uptake and distribution of these elements. The –80 mesh (–177 μm) fraction of soils in which the plants were grown were subsequently analyzed in duplicate using aqua regia digestions and ICP-OES and ICP-MS analysis; triplicates of the new growth portions of these plants were dried (at 40°C and 10% humidity), mascerated and subjected to nitric acid/aqua regia digestions and ICP-OES and ICP-MS analysis. In addition, separate plant organs (roots, leaves, old bark, old twigs, new bark, and twigs) were also analyzed by similar biogeochemical methods. Results reveal that most element concentrations in the soils generally correlate well with respective heavy metal concentrations administered, forming generally linear relationships. In the plants, with the exception of Ni, Sb, Zn, and Ag, element concentrations generally correlate well with the respective heavy metal concentrations administered, but correlate less well with the soil concentrations, probably because of variations in the relative partitioning of these experimental components. Analyses of the fi ve plant organs reveal that signifi cant translocation of the heavy metals was achieved by the plants. Different elements appear to concentrate in different plant organs, illustrating that the plants have several specifi c controlling metabolic mechanisms that redistribute these elements within their tissues. For example, Cu, As, Se, Cd, and Hg accumulated strongly in the roots, Mo accumulated strongly in the twigs, and Zn, Ag, Co, Sb, Cd, and Cr accumulated moderately in the bark and to a lesser extent in the leaves. Results indicate that willow could represent an effective phyto-remediation agent for many soils contaminated by heavy metals. Signifi cant uptake by Salix during the growing season could effectively temporarily isolate the contaminants from the environment. Subsequent removal and treatment or recovery of heavy metals from the plant tissues could represent an effective remediation strategy that is far less costly and time consuming than traditional remediation efforts.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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) | 0.001 | 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".