Presentations and recommendations from the workshop on the role of geochemical data in environmental and human health risk assessment, Halifax, 2010
Notice bibliographique
Résumé
It is recognized that knowledge of geochemistry is an important component of environmental and human health risk assessments. Although much geochemical information needed to better inform risk assessments exits already, these data are not well represented in many of these assessments. As a step towards improving practice in this area, Health Canada and Environment Canada sponsored a workshop on the role of geochemical data in ecological and human health risk assessments. The Workshop was presented by scientists from the Geological Survey of Canada with recognized expertise in bedrock and surficial sediment geochemistry. The Workshop was by invitation and included federal and provincial representatives and members of the environmental consulting community. The Workshop covered the following topics: Use of geochemical data in risk assessments - a consultant's view Causes of variation in geochemical data - natural spatial (horizontal and vertical) and analytical controls Field sampling and analytical protocols Estimating background geochemical composition Case studies involving geochemical data Discussion of priorities for improving practice and identifying gaps in existing data. One aim of the Workshop was to develop a strategy for improving the guidelines for risk assessments by promoting more rigorous use of geochemical information. More specifically, the focus was on the application of existing geochemical data and on the needs for new types of data and developing tools for their application. Information and ideas from the presentations and discussions are gathered here in a final document. The document includes the Workshop proceedings and also contains lists of recommendations for making updates to existing guidelines, where appropriate. For the purposes of this Workshop, geochemical information was restricted to the chemical elements associated with inorganic substances. The focus was on As, Cd, Cu, Ni, Pb, and Zn, in particular. Issues related to organic substances were not considered. There were presentations on a series of topics relevant to risk assessment, followed by discussions and recommendations for improving practice. The discussions were guided to ensure that Workshop participants were familiar with the concern and also the guideline. Case studies were used to reinforce the concepts. There was also a session dedicated to identifying knowledge gaps and making plans for moving forward. The Workshop was held in the Radisson Hotel in Halifax, Nova Scotia, on March 17th and 18th, 2010. Additional introductory information on the Workshop is provided in the file entitled "Start Here_Executive Summary" and also in the 01_INTRODUCTION directory. This Open File provides a record of the presentations and other documents associated with the Workshop. The contents of Geological Survey of Canada Open File 6645 are organized into 10 directories, representing introductory materials (e.g. agenda and abstracts) and the 9 sessions and areas of subject matter covered at the Workshop. The directories related to the 9 sessions contain pdf files of the presentations. There is a complete listing and more explanation of the directories in the file entitled "Start Here_Executive Summary".
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,013 | 0,015 |
| Méta-épidémiologie (sens strict) | 0,003 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,002 |
| Bibliométrie | 0,002 | 0,002 |
| Études des sciences et des technologies | 0,004 | 0,001 |
| Communication savante | 0,011 | 0,006 |
| Science ouverte | 0,005 | 0,008 |
| Intégrité de la recherche | 0,012 | 0,010 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,145 | 0,081 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».