Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2014 Vol: 6 Issue: 3

Color reaction of m-acetylchlorophosphonazo and nickel(II)


In pH 6.8 triacid (phosphoric acid, acetic acid, boric acid)-NaOH buffer medium, nickel (II) and m-acetyl-chlorophosphonazo (CPAmA) form a 1:3 blue complex. At the maximum absorption wavelength of 610 nm, Beer’s law is obeyed over the range of 0.1 ~ 4.0 μ g / mL for nickel content and the apparent molar absorption coefficient of method is ε 610 nm = 1.13 × 104 L. This method has been applied to the determination of nickel in kelp.

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