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  • 1 Professor Skubiszewski Medical University of Lublin Department of Food and Nutrition, Faculty of Pharmacy 4 Staszica Str. 20-081 Lublin Poland
  • | 2 Professor Skubiszewski Medical University of Lublin Chair and Department of Medicinal Chemistry, Faculty of Pharmacy 6 Chodźki Str. 20-093 Lublin Poland
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3-Mercapto-5-(2′-hydroxynaphthylazo-1′)-1,2,4-triazole (metrian); 3-mercapto-5-(3′,4′-dihydroxyphenylazo-1′)-1,2,4-triazole (metriap); 3-mercapto-5-(2′,4′-dihydroxy-3′-carboxyphenylazo-1′)-1,2,4-triazole (metriarez-γ), and 2-mercapto-5-(2′,4′-dihydroxy-5′-carboxyphenylazo-1′)-1,3,4-thiadiazole (metidarez-β) have been used to determine, by different methods, milligram quantities of Fe(II) and Zn(II), present together in pharmaceutical preparations, both multivitamin preparations and preparations containing microelements. Results from ion chromatography (IC) were compared with those from classical spectrophotometry (D 0 ), derivative spectrophotometry (D 1 and D 2 ), and atomic absorption spectrometric (AAS). Results were analyzed statistically and compared with the declared amount. The advantages of the proposed method for determination of Fe(II) and Zn(II) include its excellent precision and the reproducibility of the results.

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