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2003•Chemia AnalitycznaRequires access

The sensitive spectrophotometric method for the determination of cobalt with 2-(2-quinolinylazo)-5-diethylaminobenzoic acid

Liang Wang, Guangyu Yang, Qiufen Hu, Zhuobin Yuan, Jiayuan Yin

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Abstract

A sensitive, selective and fast method for the determination of cobalt using 2-(2-quinolinylazo)-5-diethylaminobenzoic acid (QADEAB) as chromogenic reagent has been described. QADEAB reacts with Co(II) in acetate buffer (pH 4.0) and cetyl trimethylammonium bromide (CTMAB) media to form a violet complex of a molar ratio of cobalt to QADEAB equal 1:2. Its molar absorptivity at 630 nm is 1.4 × 10 5 L mol - 1 cm - 1 . Beer's law is obeyed for cobalt concentration ranging from 0.01 to about 0.32 μg mL - 1 .

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A sensitive, selective and fast method for the determination of cobalt using 2-(2-quinolinylazo)-5-diethylaminobenzoic acid (QADEAB) as chromogenic reagent has been described. QADEAB reacts with Co(II) in acetate buffer (pH 4.0) and cetyl trimethylammonium bromide (CTMAB) media to form a violet complex of a molar ratio of cobalt to QADEAB equal 1:2. Its molar absorptivity at 630 nm is 1.4 × 10 5 L mol - 1 cm - 1 . Beer's law is obeyed for cobalt concentration ranging from 0.01 to about 0.32 μg mL - 1 .

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Available abstract

A sensitive, selective and fast method for the determination of cobalt using 2-(2-quinolinylazo)-5-diethylaminobenzoic acid (QADEAB) as chromogenic reagent has been described. QADEAB reacts with Co(II) in acetate buffer (pH 4.0) and cetyl trimethylammonium bromide (CTMAB) media to form a violet complex of a molar ratio of cobalt to QADEAB equal 1:2. Its molar absorptivity at 630 nm is 1.4 × 10 5 L mol - 1 cm - 1 . Beer's law is obeyed for cobalt concentration ranging from 0.01 to about 0.32 μg mL - 1 .

Key concepts: Chemistry, Molar absorptivity, Reagent, Cobalt, Chromogenic, Bromide, Buffer solution, Nuclear chemistry

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