Spectrophotometric determination of manganese with derivatives of 1,3,3-trimethyl-2-[3-(1,3,3-trimethyl-1,3-H-indol-2-ylidene)propenyl] -3H-indolium

Ioseph S. Balogh, Vasil Andruch, Mária Kovács

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A new, simple, rapid, and sensitive spectrophotometric method has been developed for the determination of manganese in sewage. The method is based on the reaction of manganese with derivatives of 1,3,3-trimethyl-2-[3-(1,3,3- trimethyl-1,3-H-indol-2-ylidene)propenyl]-3H-indolium to form a colored ion associate with a sensitive absorption maximum at 560 nm. The appropriate reaction conditions have been established: pH 8.5-10.0, 1.25-2.3×10 -3 mol L-1 1-nitroso-2-naphthol, and 1.6-2.4×10 -4 mol L-1 dye reagent. Beer's law is obeyed for manganese concentrations up to 4.2 mg L-1. The limit of detection is 0.01 mg L-1 Mn2+; the molar absorptivity of the ion associate was 7.5×104 L mol-1 cm-1. The effect of various foreign ions was examined. A reaction mechanism is suggested. The developed procedure was tested for determination of manganese in sewage with satisfactory precision and accuracy.

Original languageEnglish
Pages (from-to)709-714
Number of pages6
JournalAnalytical and Bioanalytical Chemistry
Issue number4
Publication statusPublished - Oct 1 2003



  • Carbocyanine dye
  • Manganese
  • Spectrophotometry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry

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