Separation and simultaneous determination of cobalt, nickel and copper with 2-(4-methyl-2-quinolylazo)-5-diethylaminophenol by reversed-phase high-performance liquid chromatography |
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| Authors: | Niwa H Yasui T Ishizuki T Yuchi A Yamada H Wada H |
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| Affiliation: | Laboratory of Analytical Chemistry, Department of Applied Chemistry, Nagoya Institute of Technology, Showa, Nagoya 466, Japan. |
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| Abstract: | Performance of six quinolylazo compounds was studied as a pre-column derivatizing reagent for the separation of metal ions in the reversed-phase high-performance liquid chromatography. 2-(4-Methyl-2-quinolylazo)-5-diethylaminophenol (QADP) was suited for the determination of Co, Ni and Cu in the presence of a large amount of Fe. The detection limits under the optimized conditions [stationary phase: L-column ODS; mobile phase: acetone-water (62:38, v/v) containing 0.01 M NH(4)SCN and 0.01 M 2-morpholinoethanesulfonic acid-NaOH (pH 6); injection volume: 10 mul] were 0.24 ng for Co, 0.22 for Ni and 0.53 for Cu. This method was successfully applied to the determination of these metal ions in a standard steel sample. |
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