Derivative spectrophotometric determination of trace lead in alloys and biological samples after separation and preconcentration with the ion pair of

Derivative spectrophotometric determination of trace lead in alloys and biological samples after separation and preconcentration with the ion pair of 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and ammonium tetraphenyl borate on microcrystalline naphthalene or by column method

Abstract:

Lead is quantitatively retained on 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol-ammonium tetraphenylborate with microcrystalline naphthalene or by a column method in the pH range 4.0-6.0 from a large volume of aqueous solutions of various samples. After filtration, the solid mass consisting of the lead complex and naphthalene was dissolved with 5 mL of dimethylformamide and the metal was determined by third derivative spectrophotometry. Lead complex can alternatively be quantitatively adsorbed on ammonium tetraphenylborate-naphthalene adsorbent packed in a column and determined similarly. About 0.2 g of lead can be concentrated in a column from 300 mL of aqueous sample, where its concentration is as low as 0.7 ng/mL. The interference of a large number of anions and cations has been studied and the optimized conditions developed have been utilized for the trace determination of lead in various samples.
Keywords: TRACE LEAD DETERMINATION; DERIVATIVE SPECTROPHOTOMETRY; 2-5-BROMO-2-PYRIDYLAZO-5-DIETHYLAMMINOPHENOL;AMMONIUM TETRAPHENYLBORATE; NAPHTHALENE

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