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CRITICAL TOXICITY VALUE [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-09-13

English

Subject field(s)
  • Environmental Studies and Analyses
  • Toxicology
CONT

The objective of effects characterization is to determine a critical toxicity value(CTV), or the lowest concentration of a substance that will cause a certain adverse effect for each assessment endpoint. For example, the concentration of a substance causing a 25% reduction in growth or reproduction of test organisms in a toxicity study could be selected as a CTV.

OBS

critical toxicity value : term used by Environment Canada.

French

Domaine(s)
  • Études et analyses environnementales
  • Toxicologie
CONT

La caractérisation des effets consiste à définir une valeur critique de la toxicité (VCT), ou la concentration la plus faible à laquelle une substance causera un effet nocif pour chaque point final d'évaluation. Par exemple, on pourrait choisir comme VCT la concentration à laquelle une substance cause une diminution de 25 % du taux de croissance ou de reproduction des organismes expérimentaux dans une étude de toxicité.

OBS

valeur critique de toxicité : terme en usage à Environnement Canada.

Spanish

Save record 1

Record 2 2009-08-18

English

Subject field(s)
  • Environmental Studies and Analyses
  • Pollution (General)
CONT

The first step in risk characterization is to determine a level at which the substance would not be expected to affect the assessment endpoints. This is known as the estimated no effects value(ENEV), and is usually derived by dividing the CTV [critical toxicity value] by an application factor.

OBS

estimated no effects value: term used by Environment Canada.

French

Domaine(s)
  • Études et analyses environnementales
  • Pollution (Généralités)
CONT

Dans la caractérisation du risque, il faut tout d'abord déterminer la concentration à laquelle la substance n'aurait probablement pas d'effets sur les points finaux d'évaluation. Il s'agit de la valeur estimée sans effet observé (VESEO), qui est ordinairement calculée en divisant la VCT [valeur critique de la toxicité] par un facteur d'application.

OBS

valeur estimée sans effet observé : terme en usage à Environnement Canada.

Spanish

Save record 2

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