LC50 stands for which definition?

LC50 stands for which definition?

• A. Lethal Concentration 50% fatal
• B. Lethal Concentration 50% nonfatal
• C. Lethal Concentration 0% fatal
• D. Lethal Concentration 100% fatal

Answer: (A)

LC50 is a measure of acute toxicity that describes the concentration of a substance in the exposure medium (air or water) that will kill 50% of the exposed population within a defined period. It emphasizes lethal outcomes at a specific concentration, not nonfatal effects, zero fatalities, or all fatalities. A lower LC50 means the substance is more toxic because a smaller concentration causes death in half the group. This value is time-dependent and is often used to compare hazards between substances, with units like mg/L or ppm depending on the medium.

LC50 is a measure of acute toxicity that describes the concentration of a substance in the exposure medium (air or water) that will kill 50% of the exposed population within a defined period. It emphasizes lethal outcomes at a specific concentration, not nonfatal effects, zero fatalities, or all fatalities. A lower LC50 means the substance is more toxic because a smaller concentration causes death in half the group. This value is time-dependent and is often used to compare hazards between substances, with units like mg/L or ppm depending on the medium.