Spectrofotometric determination of copper in medical formulations, weat bran and drinking water.

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) (lam bda(max) = 346 nm, epsilon = 1.2 x 104 L . mol(-1) . cm(-1)) with a relativ e error of 1.12%. The interferences caused by numerous ions have been studi ed. 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 (rea gent:cation). The method was applied to the determination of copper in medi c formulations, drinking water and wheat bran with satisfactory results.