Determination of Trace Quantities of Copper in Food Products

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Abstract

The interaction of copper (II) with an azo com-pound based on chromotropic acid – disodium salt of 2,7‑bis(azo‑2‑dihydroxy‑3‑sulfo‑5‑nitrobenzene)-1,8‑dihydroxynaphthalene‑3,6‑disulfonic acid (R) in the presence of diantipy-rylmethane (DAM) and ethylenediamine (ED) was studied. The influence of the concentration of reactants, time and temperature on the formation of mixed-ligand complexes was established, and the stability constants and the linearity range of the calibration graph were calculated. It was found that in the presence of excess ions of Cd (II), Zn (II), Mn (II), Co (II), Ni (II), etc., copper (II) can be selectively determined in the form of mixed-ligand complexes Cu(II)-R-ED(DАМ). The developed method for determining copper in the form of mixed-ligand complex Cu(II)-R-ED was tested in the analysis of food products (peas and buckwheat).

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About the authors

Vusala Ismayil Mardanova

Бакинский государственный университет

Author for correspondence.
Email: vusala_chem@mail.ru
ORCID iD: 0009-0002-1358-8483

Ph.D. (Chemistry), research fellow of the Research Laboratory, lecturer of the Department of Ecological Chemistry and Analytical Chemistry

Azerbaijan, г. Баку

Khalil Jamal Nagiyev

Бакинский государственный университет

Email: xalil-71@rambler.ru
ORCID iD: 0000-0003-3349-1486

D.Sc. (Chemistry), Prof., Lecturer, Department of Analytical Chemistry

Azerbaijan, г. Баку

Famil Musa Chiragov

Бакинский государственный университет

Email: Ciraqov@mail.ru
ORCID iD: 0000-0002-8899-4622

D.Sc. (Chemistry), Prof., Head of the Department of Analytical Chemistry

Azerbaijan, г. Баку

Minaya Farhad Mamedova

Бакинский государственный университет

Email: journal@electronics.ru

Ph.D., Lecturer, Department of Analytical Chemistry

Azerbaijan, г. Баку

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2. Pain. 1. The structural formula of disodium salt is 2,7-bis(azo-2-dihydroxy-3-sulfo-5-nitrobenzene)-1,8-dihydroxynaphthalene-3,6-disulfonic acid

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3. 2. Diagram of the distribution of various forms of disodium salt of 2,7-bis(azo-2-hydroxy-3-sulfo-5-nitrobenzene)-1,8-dihydroxynaphthalene-3,6-disulfonic acid depending on the pH of the medium.

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4. Reece. 3. Spectra pogloshcheniya Rastvorov complexov Medi (may) PRI optimalnom RN sredy: 1. R; 2. Cu(II)-R; 3. Cu(II)-R-ED; 4. Of allah (allah)-allah (allah) - allah (allah) - allah (allah). SSI = 4.0 · 10-5 m, MAA = 1.2 · 10-4 m, MAA(MAA) = 1.2 · 10-4 m, MAA-40, Maa = 1.0 cm

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5. Reece. 4. Zavisimosti opticheskoy plotnosti Rastvorov complexov Medi (Maag) OT RN PRI maagmax.: 1. Cu(II)-R, 2. Cu(II)-R-ED, 3. Of allah (allah)-allah (allah) - allah (allah) - allah (allah). SSI = 4.0 · 10-5 m, MAA = 1.2 · 10-4 m, MAA(MAA) = 1.2 · 10-4 m, MAA-40, Maa = 1.0 cm

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Copyright (c) 2025 Mardanova V.I., Nagiyev K.J., Chiragov F.M., Mamedova M.F.