Simultaneous determination of chromium (III) and copper (II) by using derivative spectrophotometry with MEDTA

Seco-Lago, H.; Pérez-Iglesias, J.; Fernández-Solís, J. M.; Castro-Romero, J. M.; González-Rodríguez, M. Victoria

doi:10.1007/s002160050190

Cited by 8 publications

(1 citation statement)

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“…1 The derivative spectra have two characteristics: (1) the absorption maximum of each spectrum corresponds to the point where the first derivative is zero; (2) the maximum and minimum of the first derivative correspond to the inflexion points, points where the slope of the absorption spectrum is decreasing or increasing, respectively. 2 In the quantitative analysis of mixtures of two components with highly overlapping spectra, the zero-crossing method, developed by O'Haver, 3 applied to derivative spectrophotometry, is frequently used. This method is based on the measurement of the absolute value of the derivative spectrum of the mixture at abscissa value (wavelength) where the intensity of one of the components of the mixture goes to zero.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Nickel(II) and Copper(II) by Second‐Derivative Spectrophotometric Method in Micellar Media

Pouretedal

Rafat

2007

J Chinese Chemical Soc

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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 mg mL -1 for both ions in the presence of 0.0-5.0 mg 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 mg 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.

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Section: Introductionmentioning

confidence: 99%