TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

THRESHOLD CONCENTRATION [4 records]

Record 1 2012-01-04

English

Subject field(s)
  • Analytical Chemistry
  • The Nose (Medicine)
  • Environmental Studies and Analyses
  • Toxicology
DEF

The lowest concentration in air at which the odour of a material can be detected and/or recognized.

French

Domaine(s)
  • Chimie analytique
  • Nez (Médecine)
  • Études et analyses environnementales
  • Toxicologie
OBS

La méthode ASTM D1391-57 (de l'American Society for Testing and Materials) utilise un groupe de 6 ou 8 expérimentateurs que l'on soumet à des dilutions croissantes (concentrations décroissantes) du polluant dans de l'air frais, jusqu'à ce que 50 % des membres déclarent ne plus rien déceler. La concentration correspondante est appelée «odeur minimum identifiable».

Spanish

Save record 1

Record 2 1995-07-24

English

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

According to Doug Forsythe, Pesticides Evaluator, Canadian Wildlife Service, Environment Canada, the concentration at which mortality of organisms begins to occur following introduction of pesticide.

OBS

One of the difficulties of licensing the use of poisonous chemicals lies in determining whether there is a threshold dose below which humans will not be harmed.

French

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

Terme proposé sur le modèle de "dose seuil" : dose absorbée minimale qui produit un effet déterminé. (Source : ISO-921, 1972.)

Spanish

Campo(s) temático(s)
  • Estudios y análisis del medio ambiente
  • Toxicología
Save record 2

Record 3 1990-02-01

English

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

The concentration causing death in one half of the test specimens in a 96-hour exposure.

OBS

TLm = Tolerance limit, median.

French

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

Niveau de tolérance correspondant à la teneur à laquelle 50 p. 100 des sujets d'un test survivent après 96 heures d'exposition.

OBS

Certains auteurs utilisent plutôt des quasi-synonymes plus répandus, tel "concentration létale moyenne en 96 heures".

Spanish

Save record 3

Record 4 1988-03-03

English

Subject field(s)
  • Environmental Studies and Analyses
  • Air Pollution
OBS

... because arctic vegetation and wild life are in critical equilibrium with the harsh environment, threshold pollution concentrations causing ecological damage may be lower than in the temperate zone.

French

Domaine(s)
  • Études et analyses environnementales
  • Pollution de l'air

Spanish

Save record 4

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