First derivative spectrophotometry for individual and simultaneous determination of magnesium(II) and copper(II) using emodin(1,3,8-trihydroxy-6-methylanthraquinone) as reagent.
First derivative spectrophotometry are presented in comparison with simple spectrophotometric method for Cu(II) and Mg(II) determination with emodin in alkaline pH range. The molar absorptivity at the lambda(max) of 572 nm and 553 nm for Cu(II) and Mg(II) are 5.5 x 10(3) and 3.9 x 10(3) lit/mol/cm, respectively. Zero crossing measurement technique is found suitable for the simultaneous determination of the metal ions. The interference effects, statistical analyses and limits of detection are also reported.
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Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India.
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