SciELO - Scientific Electronic Library Online

 
vol.35 issue8Study by mass spectrometry of solutions of [hydroxy(tosyloxy)iodo]benzene: proposed disproportionation mechanismsHighly improved chromium (III) uptake capacity in modified sugarcane bagasse using different chemical treatments author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Química Nova

Print version ISSN 0100-4042

Abstract

SOMERA, Bruna Fabrin et al. Cloud point extraction/preconcentration of copper ions exploiting the formation of complexes with DMTI [4,5-dimercapto-1,3-dithyol-2-thionate]. Quím. Nova [online]. 2012, vol.35, n.8, pp. 1600-1605. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422012000800020.

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).

Keywords : cloud point preconcentration; copper; DMIT [4,5-dimercapto-1,3-dithyol-2-thionate].

        · text in Portuguese     · pdf in Portuguese