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O uso de luminol foi importante para a análise pericial da PM Gisele Alves Santana Rosa, morta em São Paulo, e a consequente prisão do seu marido, o tenente-coronel Geraldo Leite Rosa Neto. A partir do reagente e outras evidências, a polícia conseguiu montar o "cenário do crime". O que mostrou o luminol O luminol é um reagente químico que detecta vestígios de sangue. Ao administrá-lo em superfícies, ele mostra se há sinais de sangue que não são vistos a olho nu. Havia resquícios de sangue em vá
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O que o sangue e esse pó amarelo têm em comum para fazer o luminol acender no escuro? A resposta envolve ferro. Mas não é simplesmente porque “os dois têm ferro”. Primeiro, o luminol é colocado em meio básico com hidróxido de sódio . Depois entra o peróxido de hidrogênio , que atua como agente oxidante. Sem algo que favoreça o processo, porém, a emissão pode ser muito menos intensa. É aí que entra o ferricianeto de potássio, K₃[Fe₆]. Nesse complexo, o ferro está fortemente coo
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Carregando
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