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Issue 5, 2000
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Nickel is quantitatively retained on 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP)–ammonium tetraphenylborate with microcrystalline naphthalene or by a column method in the pH range 9.0–10.5 from a large volume of aqueous solutions of various samples. After filtration, the solid mass consisting of the nickel complex and naphthalene was dissolved with 5 ml of dimethylformamide and the metal was determined by atomic absorption spectrometry. The nickel complex can alternatively be quantitatively adsorbed on ammonium tetraphenylborate–naphthalene adsorbent packed in a column and determined similarly. The calibration curve is linear at 0.30–18 ppm in dimethylformamide solution. Eight replicate determinations of 5.0 ppm of nickel gave a mean absorbance of 0.096 with a relative standard deviation of 1.5%. The sensitivity for 1% absorption was 0.23 µg ml–1. The interference of a large number of anions and cations has been studied and the optimized conditions developed were utilized for the trace determination of nickel in various standard samples.

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Publication details

The article was received on 23 Nov 1999, accepted on 18 Feb 2000 and first published on 26 Apr 2000

Article type: Inter-laboratory Note
DOI: 10.1039/A909235H
J. Anal. At. Spectrom., 2000,15, 573-576

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    Atomic absorption spectrometric determination of trace amount of nickel in alloys and biological samples after preconcentration with the ion pair of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and ammonium tetraphenylborate on microcrystalline naphthalene or by column method

    M. Ali Taher, J. Anal. At. Spectrom., 2000, 15, 573
    DOI: 10.1039/A909235H

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