Solid-phase spectroscopic determination of copper (II) ions using a modified anion exchanger
Abstract
Copper is a vital micronutrient for humans with an important physiological role. However, an excessive level of this element can lead to pathological changes in the body. It is not always possible to directly measure the content of this element at the MPC level and below in food and water using common methods, due to the influence of the matrix composition of the samples. As a result, methods for determination of low concentrations of copper in various objects are of great interest. One of these methods involves the application of selective polymeric complexing sorbents and solid-phase spectrophotometry, which provide selectivity and efficiency in the concentration of various substances from objects of complex composition.
The purpose of this study was the synthesis of a sorbent modified with a chelating reagent for the solid-phase spectroscopic determination of Cu(II) ions. This was achieved by modifying highly basic anion resin via immobilization of 2-hydroxy-2′-carboxy-5-sulfoformazylbenzene – zincone on it, as well as optimization conditions of concentration and extraction of copper (II) ions by the obtained sorbent.
The conditions for the immobilization of the reagent on an anion-exchange resin brand AB-17-8: acidity (pH 2-10), phase contact time (τmin=25 min), optimal capacity for zincon (CECCN=340 mg/g) were studied. Taking into account the obtained data, a modified sorbent AB-17-CN was synthesized. The conditions for the concentration of copper (II) were determined for AB-17-CN (pH=5.5±0.5, τmin=10 min) and achievable capacity (CECCu(II)=31.2 mg/g). Diffuse reflectance spectra were obtained for all components and their systems, and the corresponding absorption peak for the complex was established at wavelength λAV-17-CN-Cu= 700 nm, for which there was no influence of absorption by other AB-17-8 and AB-17-CN components. The study demonstrated the possibility of using AB-17-CN for the solid-phase spectroscopic determination of Cu(II) in the concentration range 0.02 – 0.2 mg/dm3with a detection limit of 0.015 mg/dm3. The correctness of the results was checked by the "introduced-found" method and independent atomic absorption method. The applicability of the proposed method for the analysis of the natural water was demonstrated.
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References
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