2004•Chemical ReagentsRequires access

Study on spectrophotometric determination of cobalt(II) in environmental samples with 2-(2-quinolinylazo)-5-dimethylphenol

Cui Yong-chun

Abstract

The color reaction of 2-(2-quinolinylazo)-5-dimethylphenol(QADMAP) with cobalt(Ⅱ) was studied.In the presence of CTMAB and in pH 3.5 buffer solution medium,QADMAP could react with cobalt(Ⅱ) to form a stable 2∶1 complex.The molar absorptivity was 1.22×10 5L·mol -1 ·cm -1 at 610 nm.Beer′s law was obeyed in the range of 0～1.0μg/mL.This method could be applied to the determination of cobalt in environmental samples with good results.

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Key concepts: Cobalt, Chemistry, Molar absorptivity, Color reaction, Spectrophotometry, Buffer solution, Molar ratio, Nuclear chemistry