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vol.44 número4QUANTITY AND QUALITY OF b-CAROTENE PRODUCED BY TWO STRAINS OF DUNALIELLA SALINA (TEODORESCO 1905) FROM THE NORTH OF CHILEDETERMINACION DE METAMIZOL-SODICO EN SUPOSITORIOS POR CROMATOGRAFIA EN CAPA FINA DE ALTA EFICIENCIA (HPTLC) índice de autoresíndice de assuntospesquisa de artigos
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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

LOPEZ-DE-ALBA, PEDRO LUIS; LOPEZ-MARTINEZ, LETICIA  e  AMADOR-HERNANDEZ, JUDITH. DETERMINACION ESPECTROFOTOMETRICA DE COBRE EN FORMULACIONES MEDICAS, SALVADO DE TRIGO Y AGUAS POTABLES. Bol. Soc. Chil. Quím. [online]. 1999, vol.44, n.4, pp.469-477. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16441999000400011.

The yellow complex formed betwen Cu(II) and thiosemicarbazone of 2-carboxy benzaldehyde (2CBTSC) was studied spectrophotometrically. The use of 2CBTSC as an analytical reagent in photometric estimation of Cu(II) is described. The method is suitable in the range between 0.5 and 5.0 ppm of Cu(II) (lmax = 346 nm, e = 1.2 x 104 L·mol-1·cm-1) with a relative error of 1.12%. The interferences caused by numerous ions have been studied. The stoichiometry of the complex originated by the 2CBTSC with the ion Cu(II) has been determined by spectrophotometric methods and it is 1:1 (reagent:cation). The method was applied to the determination of copper in medic formulations, drinking water and wheat bran with satisfactory results

Palavras-chave : Spectrophotometric; thiosemicarbazone; 2-carboxybenzaldehyde; copper.

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