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Simultaneous Determination of Nickel(II) and Copper(II) by Second‐Derivative Spectrophotometric Method in Micellar Media
Author(s) -
Pouretedal Hamid Reza,
Rafat Marym
Publication year - 2007
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200700025
Subject(s) - chemistry , chromogenic , nickel , reagent , copper , bromide , derivative (finance) , ion , detection limit , analytical chemistry (journal) , buffer solution , spectrophotometry , chromatography , inorganic chemistry , organic chemistry , financial economics , economics
A second‐derivative spectrophotometric method based on zero‐crossing over technique is developed in simultaneous determination of copper(II) and nickel(II) ions. Methylthymol blue (MTB) as a chromogenic reagent and cetyltrimethylammonium bromide as a surfactant were used, and measurements were carried out in buffered solution at pH 6 and at a temperature of 25 °C. The amplitude of derivative spectra was measured at wavelengths of 631.9 and 587.7 nm for the simultaneous determination of Ni 2+ and Cu 2+ , respectively. Linearity was obtained in the range of 0.5–5.0 μg mL −1 for both ions in the presence of 0.0–5.0 μg mL −1 of the other ion as an interfering ion. IUPAC detection limits for Cu 2+ and Ni 2+ ions were obtained at 0.48 and 0.43 μg mL −1 , respectively. The proposed procedure has been applied successfully for the simultaneous determination of copper and nickel in synthetic binary mixtures and real samples.