Mercury in till and bedrock southeast of Kejimkujik National Park, Nova Scotia
Bibliographic record
Abstract
Loons in Kejimkujik National Park, located in southwestern Nova Scotia, contain the highest mercury concentrations in blood of any breeding loon population tested in North America. A team of multi-disciplinary scientists has completed extensive research within and around the park in an attempt to identify the source(s) and process(es) that may be responsible for the high levels of mercury. One aspect of the research involved the collection of 32 C-horizon till samples from depths ranging from 70 to 120 cm. The samples were collected at 100 to 200 m intervals from three northwest-southeast transects that cross the inferred contact between the Halifax and Goldenville formations south of the Kejimkujik National Park boundary. Geochemical analysis (<63 µm size fraction) of the till indicates that the mean Hg concentrations are 40.8 ppb for till overlying slate of the Halifax Formation, and 32.4 ppb for till overlying greywacke of the Goldenville Formation. Chemical analyses of 9 bedrock samples (<105 µm size fraction) returned very low Hg concentrations (mean 2.4 ppb). Strict quality assurance/quality control protocols were followed in the collection, preparation, and analysis of the till and bedrock samples.
 
 RÉSUMÉ
 
 Les huards du parc national Kejimkujik, situé dans le Sud de la Nouvelle-Écosse, présentent les concentrations de mercure dans le sang les plus élevées parmi toutes les populations de huards examinées en Amérique du Nord. Une équipe pluridisciplinaire de scientifiques a réalisé des travaux de recherche approfondis à l'intérieur et à proximité du parc pour tenter de repérer la ou les sources et le ou les processus à l'origine des concentrations élevées de mercure. Un volet de ces recherches a comporté le prélèvement de 32 échantillons de till de l'horizon C à des profondeurs variant entre 70 et 120 cm. Les échantillons ont été prélevés à des intervalles de 100 à 200 m à l'intérieur de trois transects du nord-ouest au sud-est traversant la présumée zone de contact entre les formations d'Halifax et de Goldenville, au sud de la limite du parc national Kejimkujik. Une analyse géochimique (fraction d'une dimension de moins de 63 µm) du till révèle des concentrations moyennes de Hg de 40,8 p.p. 109 b dans le till recouvrant l'ardoise de la Formation d'Halifax et de 32,4 p.p. 109 dans le till recouvrant la grauwacke de la Formation de Goldenville. Des analyses chimiques de neuf échantillons de substrat rocheux (fraction d'une dimension de moins de 105 µm) ont accusé des concentrations très faibles de Hg (en moyenne 2,4 p.p. 109). Les chercheurs ont suivi des protocoles rigoureux d'assurance/de contrôle de la qualité lors du prélèvement, de la préparation et de l'analyse des échantillons de till et de roche du substratum.
 
 [Traduit par la rédaction]
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How this classification was reachedexpand
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 | 0.000 |
| 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 teacher head, 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".