The difference between Lethal Dose and Lethal Concentration is that Lethal Dose measures the amount of substance, while Lethal Concentration measures what?

The difference between Lethal Dose and Lethal Concentration is that Lethal Dose measures the amount of substance, while Lethal Concentration measures what?

• A. The amount per volume of air
• B. The rate of absorption
• C. The time to death
• D. The population incidence

Answer: (A)

The key idea is dose versus concentration. Lethal dose tells you the total amount of substance needed to cause death, usually expressed relative to body weight (for example mg per kg). Lethal concentration, however, tells you how much of the substance is present in the environment the organism is exposed to. In inhalation terms, this is the amount per volume of air (for example mg per cubic meter). So the lethal concentration measures the concentration in the exposure medium, not the total dose the organism receives.

The key idea is dose versus concentration. Lethal dose tells you the total amount of substance needed to cause death, usually expressed relative to body weight (for example mg per kg). Lethal concentration, however, tells you how much of the substance is present in the environment the organism is exposed to. In inhalation terms, this is the amount per volume of air (for example mg per cubic meter). So the lethal concentration measures the concentration in the exposure medium, not the total dose the organism receives.