LC50 is defined as what?

LC50 is defined as what?

• A. Concentration of dust, mist, vapor or gas in air or water that kills 50% of test population
• B. Dose that kills 50% upon ingestion
• C. The maximum safe dose
• D. The time-weighted average exposure

Answer: (A)

LC50 is the concentration of a toxicant in the exposure medium (air for inhalation, water for aquatic exposure) that is expected to kill 50% of the test population within a specified time. It’s a statistical measure derived from exposure studies and is used to compare acute toxicity across substances and routes of exposure. This differs from LD50, which refers to the dose needed to kill 50% via ingestion or another non-inhalation/ non-aquatic route, and from the maximum safe dose or from time-weighted average exposure.

LC50 is the concentration of a toxicant in the exposure medium (air for inhalation, water for aquatic exposure) that is expected to kill 50% of the test population within a specified time. It’s a statistical measure derived from exposure studies and is used to compare acute toxicity across substances and routes of exposure. This differs from LD50, which refers to the dose needed to kill 50% via ingestion or another non-inhalation/ non-aquatic route, and from the maximum safe dose or from time-weighted average exposure.