Assessment of Fraction-Specific Toxicity and Derivation of Recommended Soil Quality Guidelines for Crude Oil in Agricultural/Grassland Soils
Notice bibliographique
Résumé
Abstract This research project was initiated in 1998 and was commissioned by PTAC (Petroleum Technology Alliance Canada). The purpose of the project is to collect, through a combination of laboratory and field studies, scientifically defensible data that can be used to derive risk-based soil quality guidelines for petroleum hydrocarbons (PHCs) in agricultural soils. The project has two phases. The purpose of Phase I is to collect ecotoxicological data for specific hydrocarbon fractions. This data will be used to develop risk-based criteria. The purpose of Phase II is to evaluate short- and long-term risks posed by hydrocarbon residuals at concentrations exceeding 1,000 mg/kg. The project is targeted for completion in 2001 but preliminary data are available and will be presented. Phase I of the project, developing risk-based criteria, is proceeding following a staged approach. In the initial stage, the toxicity of the crude oil mixture and two hydrocarbon fractions to a battery of terrestrial plant and animal species in topsoil is being assessed. To date, toxicity assessments for unrefined Federated crude oil and two hydrocarbon fractions (C10 to C16 and C17 to C34) have been completed. Following assessment of these results, the toxicity will be further researched by testing an additional hydrocarbon fraction and investigating the toxic interactions of the fractions deemed responsible for significant portions of the ecotoxicology. Derivation of fraction-specific recommended soil quality guidelines will follow the toxicity testing. These guidelines will be compared with existing and proposed regulatory criteria. The results of both the laboratory and field studies will be integrated and the derived PHC guidelines will minimize the risk of impairment of soil physical, chemical and/or biological properties such that plant/cop productivity of agricultural soils will be protected. Phase II of the project, evaluating risks posed by hydrocarbon residuals exceeding 1,000 mg/kg, is being accomplished using field test plots. Two sets of field plots were established in 1999. Site One is in an area of sandy loam soils being used for the production of cereal crops. Site Two is established in clay loam soils which supported pastures utilized for cattle grazing. Both sites provide appropriate uncontaminated soils for establishing impacted and control plots, in triplicate, and landowner and industry cooperation were obtained. At both sites unrefined Federated crude oil was applied in 1999 at a calculated post-incorporation concentration of 12,000 mg/kg. At Site Two, a second acute plot was established by applying crude oil at a rate of 24,000 mg/kg. At both sites, "chronic" plots were also established on areas that contained historically weathered hydrocarbon material. The combination of "chronic" and "acute" hydrocarbon contamination allows us to compare the ecotoxicological responses of fresh versus weathered PHCs in agricultural soils. Introduction The research project was initiated in August 1998 and was commissioned by Petroleum Technology Alliance Canada (PTAC). The purpose of the project is to collect, through a combination of laboratory and field studies, scientifically defensible data that can be used to derive risk-based soil quality guidelines for petroleum hydrocarbons (PHCs) in agricultural soils. The research has been divided into two phases.
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 distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
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 tête enseignante, 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 ».