Resumo

SANTOS DE OLIVEIRA, Rayone Wesly et al. Spectrophotometric determination of Copper (II) in manioc spirit (Tiquira). Rev. colomb. cienc. quim. farm. [online]. 2020, vol.49, n.2, pp.355-373.  Epub 26-Nov-2020. ISSN 0034-7418.  https://doi.org/10.15446/rcciquifa.v49n2.89507.

The search describes the spectrophotometric reaction of the Cu (II)-PAN (1-(2-pyridilazo) -2-naphthol) complex and determines the concentration of copper (II) in manioc spirit (Tiquira). For this, we dimensioned the reaction for the studies of complex absorption, pH, stability, stoichiometric ratio, interferences, correlation, and recovery. After this step, we determined the concentration of copper (II) in five samples of beverages distilled artisanal from five municipalities of the State of Maranhão. The results show that the complex absorbs at 548 nm at pH 6, is stable at a time of 7 hours in minimum 1:1 stoichiometric proportions of the binder and metal, has a detection limit in 3.3 X 10-2 mg L-1, range (R2= 0.9990), standard deviation= 0.0035 and recovery at 104.54 ± 7.0, and the main interfering ions are iron (III) and cobalt (II). In the brandy, we find that the copper content is above that allowed by Brazilian legislation.

Palavras-chave : UV molecular absorption spectrophotometry; copper (II); cassava liquor; (1-(2-pyridylazo)-2-naphthol).

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