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Application of the Ion Pair of 2‐(5‐Bromo‐2‐pyridylazo)‐5‐diethylaminophenol and Ammonium Tetraphenylborate for Pre‐concentration of Trace Vanadium and Determination by Third Derivative Spectrophotometry
Author(s) -
Taher Mohammad Ali
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020201222
Subject(s) - chemistry , tetraphenylborate , vanadium , spectrophotometry , microcrystalline , naphthalene , aqueous solution , inorganic chemistry , ammonium , nuclear chemistry , chromatography , ion , organic chemistry , crystallography
Vanadium 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 of 2.1–4.5 from a large volume of aqueous solutions of various samples. After filtration, the solid mass consisting of the vanadium complex and naphthalene was dissolved with 5 mL of dimethylformamide and the metal was determined by the third derivative spectrophotometry. Vanadium complex can alternatively be quantitatively adsorbed on ammonium tetraphenylborate‐naphthalene adsorbent packed in a column and determined similarly. About 0.05 μg of vanadium can be concentrated in a column from 250 mL of aqueous sample, where its concentration is as low as 0.2 ng/mL. The interference of a large number of anions and cations has been studied and the optimized conditions developed were utilized for the determination of trace amount of vanadium in various samples.