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Determination of Copper(II) Ions by Diffuse Reflectance Spectroscopy Method

https://doi.org/10.32362/2410-6593-2018-14-2-78-86

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Abstract

A method for copper(II) determination based on copper(II) ions interaction with the organic reagent picramine-ε, concentrating the formed complex on a solid-phase matrix and recording diffuse reflectance spectroscopy spectra by a portable combined LED miniphotometer was developed. Poly-ε-caproamide membranes were investigated as solid-phase matrixes. It was found that the diffuse reflectance coefficient of the studied membranes in the visible spectrum region does not depend on wavelength. So, the signal from membranes does not distort the results of the analysis. Factors controlling the process of sorption of the copper(II) complex with picramine-ε were studied. It was shown that the poly-ε-caproamide membranes are effective sorbents which provide the possibility of concentrating the analyte at a level higher than 105. The dependences of analytical signal on the acidity of the solution, the time of keeping the complex in the solution and the initial volume of the solution passed through the membrane were studied. Based on the obtained data, the optimal conditions of the analysis were found. Calibration dependence of the analytical signal on the concentration of copper(II) in model solutions was estimated. The method was tested for the determination of copper(II) ions in white wine. The method of additives was used for the analysis. It was found that the concentration of copper(II) ions in “Vagrus” wine is 0.0016 mkg/ml.

About the Authors

I. I. Kuzmin
V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
Russian Federation

Junior Researcher, Laboratory of Instrumental Methods and Organic Reagents

GEOKHI RAS, 19, Kosygina St., Moscow 119991, Russia



T. Kh. Chyong
MIREA – Russian Technological University (M.V. Lomonosov Institute of Fine Chemical Technologies)
Russian Federation

Student of the Alimarin Chair of Analytical Chemistry

86, Vernadskogo Pr., Moscow 119571, Russia



Ya. I. Simakina
V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
Russian Federation

Postgraduate Student, Junior Researcher, Laboratory of Instrumental Methods and Organic Reagents

GEOKHI RAS, 19, Kosygina St., Moscow 119991, Russia



A. V. Mikhailova
V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
Russian Federation

Ph.D. (Chemistry),Senior Researcher, Laboratory of Instrumental Methods and Organic Reagents

GEOKHI RAS, 19, Kosygina St., Moscow 119991, Russia



Yu. I. Fabelinsky
V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences
Russian Federation

Senior Researcher, Laboratory of Instrumental Methods and Organic Reagents

GEOKHI RAS, 19, Kosygina St., Moscow 119991, Russia



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Supplementary files

1. Fig. 1. LED miniphotometer: 1 – device housing of transmission measurement (the diode matrix is coaxially located with the detector); 2 – cell holder; 3 – device housing of diffuse reflection spectroscope; 4 – stand for solid phase; 5 – photodiode
Subject
Type Research Instrument
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For citation:


Kuzmin I.I., Chyong T.K., Simakina Y.I., Mikhailova A.V., Fabelinsky Yu.I. Determination of Copper(II) Ions by Diffuse Reflectance Spectroscopy Method. Fine Chemical Technologies. 2019;14(2):78-86. (In Russ.) https://doi.org/10.32362/2410-6593-2018-14-2-78-86

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)