Determination of copper with neocuproine by thermal-lens spectrometry |
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Authors: | V. V. Chernysh M. A. Proskurnin A. A. Dzyabchenko E. K. Ivanova |
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Affiliation: | (1) Department of Chemistry, Moscow State University, 119899 Vorob’evy gory, Moscow, Russia |
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Abstract: | Conditions for the spectrophotometric determination of copper with 2,9-dimethyl-l,10-phenan-throline (neocuproine) in the presence of ascorbic acid in a water-ethanol solution (9 : 1) at pH 4.5–5.0 have been found. The detection limit is 3 x 10-6 M. The concentration range is from 4.4 x 10-6 to 3 x 10-4 M. Conditions for the determination of copper(I) with neocuproine by thermal lens spectrometry have been proposed. The detection limit is 4 x 10-7 M. The concentration range is from 7 x 10-7 to 6 x 10-5 M. Iron(II) at concentrations as high asn x 10-4 M does not interfere with the determination of copper. Changes in the conditions for the photometric reaction associated with passing from spectrophotometric measurements to thermal lensing are discussed. |
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