Spectrophotometric Determination of Palladium(II) with n-Hydroxy-N,N-Diphenylbenzamidine and 1 -(2-Pyridylazo)-2-Naphthol |
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Authors: | Anju Jha R. K. Mishra |
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Abstract: | 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 × 103 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 × 104 L mol?1 cm?1. Sandell's sensitivity and the detection limit of the method are 0.0067 μg cm?2and 0.1 μg 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. |
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Keywords: | Extraction Spectrophotometry Palladium(II) determination N-Hydroxy-N,N′ -diphenylbenzamidine 1 -(2-Pyridy 1azo)-2-naphthol |
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