What is the purpose of testing 96-hr LC50 values?

Testing 96-hour LC50 values serves the specific purpose of assessing herbicide toxicity to aquatic organisms. The term "LC50" refers to the lethal concentration at which 50% of the test organisms are expected to die within a specified period, in this case, 96 hours. This testing is crucial for understanding the potential hazards that herbicides pose to fish, amphibians, and other aquatic life. It helps environmental scientists and pest control professionals determine safe application rates for herbicides to minimize adverse effects on ecosystems. By determining the LC50, practitioners can make informed decisions about the use of certain chemicals in aquatic environments, ensuring that they balance pest control with the protection of non-target species.