Discussão:Cianeto de potássio

No primeiro parágrafo do texto lê-se LD50=2500 a 5000mg Mais abaixo lê-se LD50=5mg/kg

Esses dois valores são incompatíveis! Qual deles é o correto? Pelo segundo valor letal a quantidade que mataria para uma pessoa de 80 kg seria 400mg, o que representa 1/6 da quantidade mencionada no primeiro parágrafo (o limite inferior).

Sorry for writing in English, my Portugese is very poor. But the statement that a lethal dose (not being explicitly specified, but I presume in an adult human) of KCN is 2.5—5 grams is incorrect. While the ingestion of such a large dose would certainly be fatal, the lethal dose range of potassium cyanide in adult human is usually given by most sources in the range of 2.0—3.5 mg/kg body mass (corresponding to about 0.9—1.5 mg hydrocyanic acid per kilogram body mass); in the KCN dossier in ChemIDplus (a US Government source, see the KCN Dossier in ChemIDplus), a lethal dose of potassium cyanide is reported to be 2.857 mg/kg body mass per os in one case. In a man of 75 kg BM, this would correspond to a dose of 214 mg, or 0.214 g p.o.. Potassium cyanide is simply at least 10 × as lethal as this article suggests at this moment. Cheers, --46.5.196.58 (discussão) 22h02min de 1 de novembro de 2012 (UTC)