A novel detection approach based on chromophore-decolorizing with free radical and application to photometric determination of copper with acid chrome dark blue

Hong Wen Gao, Fang Fang Chen, Ling Chen, Teng Zeng, Lu Ting Pan, Jian Hua Li, Hua Fei Luo

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

A novel detection approach named chromophore-decolorizing with free radicals is developed for determination of trace heavy metal. The hydroxyl radicals (HO{radical 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 μg mL-1 Cu(II) and the limit of detection is only 6 μg L-1 Cu(II). Besides, the Cu-ACDB complex formed was characterized.

Original languageEnglish (US)
Pages (from-to)52-59
Number of pages8
JournalAnalytica Chimica Acta
Volume587
Issue number1
DOIs
StatePublished - Mar 21 2007
Externally publishedYes

Keywords

  • Acid chrome dark blue
  • Chromophore-decolorizing
  • Determination of copper
  • Hydroxyl radicals
  • Spectral correction technique
  • Spectrophotometry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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