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Revista de Chimie (Rev. Chim.), Year 2012, Volume 63, Issue 2,





CRISTIAN F. RADU, LUMINITA VLADESCU
Spectrometric Method for Copper (II) Determination at Trace Level

Abstract:

A rapid, reliable and inexpensive method for the direct determination of Cu (II) with the organic reagent Solochrome Yellow 2GS (disodium salt of 2-hydroxy-5-[(4-sulfophenyl)azo]-benzoic acid), R is reported. In a 4-fold excess over Cu (II) concentration the organic reagent, R form with Cu (II) within pH range 6.30 - 9.43 an 1:2 (Cu:R) stable complex. The value of the total stability constant bs = 1.58 . 106 ± 0.4 . 106 L2·mol-2 was determined, which indicates the formation of a rather stable complex. On this basis a spectrometric method for the quantitative determination of copper (II) at traces level was proposed. The method is sensitive, accurate and reproducible, being characterized by a detection limit of 0.10 mg·L-1, a linearity range between 0.12 - 5.12 µg·mL-1, a recovery between 93.27% and 95.49% as well as a good repeatability and reproducibility, characterized by relative standard deviations of 3.333% and 1.392%, respectively. The method was applied in order to determine the copper contents in samples of drinking water and wine. Keywords: copper, organic reagent, determination, spectrometric study


Issue: 2012, Volume 63, Issue 2
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