LC50 22 : Lethal dose 50. 50% Lethal Concentration. The concentration of a chemical in air or of a chemical in water which causes the death of 50% (one-half) of a group of test animals
Ministry of Development, Industry and Foreign Trade, Definitions and Abbreviations, GHS (Globally Harmonized System of Classification and Labelling of Chemicals) Brazil, http://www.desenvolvimento.gov.br/arquivos/dwnl_11 97483901.pdf, (Globally Harmonized Sys of Class and Labl of Chem - Brit) {634}