What does the signal word associated with pesticides classified as slightly toxic indicate?

The signal word related to pesticides classified as slightly toxic indicates a specific range related to the oral toxicity levels of a substance, measured in terms of its lethal dose (LD50). The term "slightly toxic" is used to describe pesticides that have an oral LD50 greater than 500 mg/kg. This means that it would take more than 500 milligrams of the pesticide per kilogram of body weight to cause death in 50% of a tested population, under the specified conditions.

This classification is important for handlers and users of pesticides as it provides guidance on the potential risks associated with the products they are using. Understanding these classifications helps in recognizing safety protocols, application methods, and necessary personal protective equipment to minimize exposure.

In contrast, the other options do not accurately correspond with the definition of "slightly toxic." Options related to oral LD50 values less than 500 mg/kg would indicate a higher level of toxicity, while dermal LD50 values do not pertain to the classification of slight toxicity in terms of oral ingestion.