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  • Title: Determination of nickel with 2-(2-quinolylazo)-5-diethylaminoaniline as a chromogenic reagent.
    Author: Hu Q, Yang G, Huang Z, Yin J.
    Journal: Anal Sci; 2003 Oct; 19(10):1449-52. PubMed ID: 14596415.
    Abstract:
    A sensitive, selective and rapid method for the determination of nickel based on a rapid reaction of nickel(II) with 2-(2-quinolylazo)-5-diethylaminoaniline (QADEAA) has been developed. In the presence of pH = 6.0 ammonia-ammonium chloride buffer solution and sodium dodecyl sulfonate (SDS) medium, QADEAA reacts with nickel to form a violet complex having a molar ratio of 1:2 (nickel to QADEAA). The molar absorptivity of the complex is 1.38 x 10(5) l mol(-1) cm(-1) at 595 nm. Beer's law is obeyed in the range of 0.01-0.4 microg/ml. This method had been applied to the determination of nickel with good results.
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