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Spectrophotometric Determination of Palladium(II) with n ‐Hydroxy‐ N,N ‐Diphenylbenzamidine and 1 ‐(2‐Pyridylazo)‐2‐Naphthol
Author(s) -
Jha Anju,
Mishra R. K.
Publication year - 1993
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199300054
Subject(s) - molar absorptivity , chemistry , palladium , absorbance , chloroform , extraction (chemistry) , detection limit , metal ions in aqueous solution , metal , trace amounts , nuclear chemistry , analytical chemistry (journal) , chromatography , organic chemistry , catalysis , medicine , physics , alternative medicine , pathology , optics
A spectrophotometric method to determine palladium(II) at trace levels is based on the extraction of palladium(II) as a binary complex with N ‐hydroxy‐N,N′‐diphenylbenzamidine (HDPBA) in chloroform at pH 5.0 ± 0.2. The complex shows maximum absorbance at 400 nm with molar absorptivity 6.4 × 10 3 L mol −1 cm −1 . The sensitivity of the Pd(II)‐HDPBA complex was enhanced by the addition of l‐(2‐pyridylazo)‐2‐naphthol (PAN). The green coloured complex shows maximum absorbance at 620 nm with molar absorptivity 1.58 × 10 4 L mol −1 cm −1 . Sandell's sensitivity and the detection limit of the method are 0.0067 μg cm −2 and 0.1 μ g Pd(II) mL −1 , respectively. Most common metal ions associated with palladium metal do not interfere. The effects of various analytical parameters on the extraction of the metal are discussed.