Extração/pré-concentração de íons cobre no ponto nuvem explorando a formação de complexos com DMIT [4,5-dimercapto-1,3-ditiol-2-tionato]

• Main Authors: Bruna Fabrin Somera, Fernanda Midori de Oliveira, Wagner José Barreto, Sônia Regina Giancoli Barreto, César Ricardo Teixeira Tarley
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2012-01-01
• Series: Química Nova
• Subjects: cloud point preconcentration; copper; DMIT [4,5-dimercapto-1,3-dithyol-2-thionate]
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422012000800020&lng=en&tlng=en

The present study proposes a method for cloud point preconcentration of copper ions at pH 2.0 based on complexes formed with [4,5-dimercapto-1,3-dithyol-2-thionate] and subsequent determination by flame atomic absorption spectrometry (FAAS). Under optimal analytical conditions, the method provided limits of detection of 0.84 and 0.45 µg L-1, by preconcentrating 12.0 and 24.0 mL of sample, respectively. The method was applied for copper determination in water samples, synthetic saliva, guarana powder, tea samples and soft drinks and the accuracy was assessed by analyzing the certified reference materials Dogfish Liver (DOLT-4) and Lobster Hepatopancreas (TORT-2).