LD50 refers to the amount of a chemical that kills what proportion of test animals?

LD50, or "Lethal Dose, 50%", is a standard measurement used to assess the toxicity of a substance. It represents the dose of a chemical that is sufficient to kill 50% of a defined population of test animals, typically within a specified time frame. This metric helps researchers and regulatory bodies understand the relative toxicity of various substances, allowing for safer practices in pest control and other applications.

The significance of LD50 lies in its standardization; it provides a clear point of reference for comparing the toxic effects of different chemicals. A lower LD50 indicates a more toxic substance, as less of it is required to achieve that 50% mortality rate. This is particularly vital for pest control professionals, as it aids in making informed decisions regarding the usage and application of chemical treatments while prioritizing safety for both humans and the environment.