Terminology of the environmental effects of elements and compounds
Lethal Concentration 50. An LC50 value is the concentration of a material in air that will kill 50% of the test subjects (animals, typically mice or rats) when administered as a single exposure (typically 1 or 4 hours). This value gives you an idea of the relative toxicity of the material.
This value applies to vapors,dusts, mists and gases. Solids and liquids use the closely related LD50 value (50% lethal dose).
Lethal Dose 50. It’s the amount of a solid or liquid material that it takes to kill 50% of test animals (for example, mice or rats) in one dose.
Toxic is defined by OSHA (Ocupational Safety and Health Administration) 29 CFR 1910.1200 App A as a chemical which falls in any of these three categories:
Highly toxic is defined by OSHA (Ocupational Safety and Health Administration) as:
Toxicology is the study of the nature, effects, detection, and mitigation of poisons and the treatment or prevention of poisoning.
A toxin is a toxic substance.
Toxins that affect only specific types of cells or organs are called cytotoxins.
Some definitions were taken from The MSDS Hyperglossary (http://www.ilpi.com/msds/ref/).
To choose the Environmental effects per chemical element go to the periodic table of elements
and here to see the definitions and explanations of health effects of chemical elements