An-Najah National University

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  • Monday, October 1, 1984
  • Sensitive spectrophotometric determination of La(III) with 1-(2-pyridylazo)-2-naphthol
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  • A simple and sensitive method for spectrophotometric determination of lanthanum has been developed. At pH 9.6, in presence of 50% ethanol, lanthanum reacts with 1-(-2-pyridylazo)-2-naphthol (PAN) to form a red complex which has two absorption maxima, at 545 and 510 nm. The molar absorptivity at 545 nm is 0.55 × 104 liters · mol−1 cm−1. On the other hand, lanthanum reacts with PAN in pure ethanol to form a red complex at 530 nm, with high molar absorptivity (8 × 104 liters · mol−1 cm−1).
    Microchemical Journal, Volume 30, Issue 2, October 1984, Pages 231-234
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Kamel Jalal k. abdel-Hadi
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