Journal
ANALYTICA CHIMICA ACTA
Volume 587, Issue 1, Pages 52-59Publisher
ELSEVIER
DOI: 10.1016/j.aca.2007.01.046
Keywords
chromophore-decolorizing; hydroxyl radicals; determination of copper; acid chrome dark blue; spectral correction technique; spectrophotometry
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A novel detection approach named chromophore-decolorizing with free radicals is developed for determination of trace heavy metal. The hydroxyl radicals (HO center dot) generated from Fe(III) and hydrogen peroxide will oxidize the free chromophore into almost colorless products. The copper-acid chrome dark blue (ACDB) complexation was investigated at pH 5.07. In the presence of Fe(III) and hydrogen peroxide, the excess ACDB was decolorized in the Cu-ACDB reaction solution, and the final solution contained only one color compound, the Cu-ACDB complex. After oxidation of free hydroxyl radicals, the complexation becomes sensitive and selective and it has been used for the quantitation of trace amounts of Cu(II) dissolved in natural water. Beer's law is obeyed in the range from 0 to 0.500 mu g mL(-1) Cu(II) and the limit of detection is only 6 mu g L-1 Cu(II). Besides, the Cu-ACDB complex formed was characterized. (c) 2007 Elsevier B.V. All rights reserved.
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