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  • Title: Spectrophotometric determination of copper in alloys using naphthazarin.
    Author: Chaisuksant R, Palkawong-Na-Ayuthaya W, Grudpan K.
    Journal: Talanta; 2000 Dec 04; 53(3):579-85. PubMed ID: 18968145.
    Abstract:
    Naphthazarin (5,8-dihydroxy-1,4-naphthoquinone; Naph) is proposed as a chromogenic reagent for the spectrophotometric determination of copper(II). The polynuclear complex has a mole ratio of Cu:Naph=4:6 in a 50% v/v ethanol/water medium containing 0.1 M ammonium acetate and 1.5% (w/v) sodium dodecyl sulfate. The copper-naphthazarin complex shows an absorption maximum at 330 nm with a molar absorptivity of 1.84x10(4) l mol(-1) cm(-1). Beer's law is obeyed up to 4.5 ppm of copper(II). The method was applied for copper determination in alloy samples with satisfactory results.
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