Spectrophotometric determination of copper(II) in natural waters, vitamins and certified steel scrap samples using acetophenone-p-chlorophenylthiosemicarbazone

Abstract

A very simple, highly sensitive and selective spectrophotometric procedure was developed for the determination of copper(II). It is based on the reaction at pH 4-9 between the synthesized acetophenone-p-chlorophenylthiosemicarbazone (A-p-ClPT) and Cu(II) forming a green complex, Cu(II):A-p-ClPT (1:2), that floats quantitatively with oleic acid (HOL) surfactant. It exhibits a constant and maximum absorbance at 600 nm in both aqueous and surfactant layers. Beer ' s law is obeyed over the concentration range 0.25-6.35 mg l -1 with a detection limit of 0.021 mg l -1 for a standard aqueous solution of Cu(II) with a concentration of 3.82 mg l -1 (calculated on the basis of 3σ) and molar absorptivities of 5.5 × 10 3 and 1.3 × 10 4 mol l -1 cm -1 in aqueous and surfactant layers, respectively. Sandell's sensitivity was calculated to be 0.244 μg cm -2 and the relative standard deviation (n = 9) was 0.19%. The different analytical parameters affecting the flotation and determination processes were examined. The proposed procedure has been successfully applied to the analysis of Cu(II) in natural waters, certified scrap steel samples and vitamin samples. The results obtained agree well with those samples analyzed by atomic absorption spectrometry (AAS). Moreover, the flotation mechanism is suggested based on some physical and chemical studies on the solid complexes isolated from aqueous and surfactant layers.

Bonding and structure trends of thiosemicarbazone derivatives of metals—An overview

“…The Cu II acetophenone-pchlorophenylthiosemicarbazone III complex floats quantitatively with the oleic acid surfactant, which can be separated further. Beer's law is obeyed over concentration range of 0.25-6.35 mg L −1 , with the detection limit of 0.021 mg L −1 [385]. Benzildithiosemicarbazone IV has been used for the determination of both Cu II and Pd II by the extractive spectrophotometric method (pH 1-7, Cu II ; 2.5, Pd II ).…”

Ion Flotation of Copper(II) and Lead(II) from Environmental Water Samples

“…However, without doubt, Cu 2+ ions that are present in various aqueous solutions (their presence is a function of pH) are considered to be the most toxic of dissolved copper species (Freematle, 1989;Khalifa et al, 2001;Sorenson, 1991). Excess copper in water is not only harmful to human beings, but also interferes with the self-purification of bulk water (Ghazy et al, 2006) and adverse effect on the microbiological treatment of wastewater . Lead is a natural compound that exists in elemental, inorganic, and organic forms.…”

Spectrophotometric Method for the Determination of Copper (II) in Leafy Vegetable, Soil, Alloys and Pharmaceutical Samples Using 3-Methylthiophene-2-Carbaxaldehyde-3-Thiosemicarbazone (3-MTAT)

“…The composition of the Cu (II) complex with 3-MTAT was studied using Job's method of continuous variation, and the mole ratio method [16]. Spectrophotometric investigation of the metal complex was conducted to obtain the composition of the complex.…”