Analytical chemistry council

METHODS AND OBJECTS OF CHEMICAL ANALYSIS

ISSN title: "Metody i obʺekty himičeskogo analiza"

An international journal devoted to all aspects of Analytical chemistry

ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)

Kiev University
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TESTING OF ANALYTICAL SIGNAL ADDITIVITY AT DETERMINATION OF SUM OF METALS WITH THE USE OF SOLID-PHASE REAGENTS

E.A. Reshetnyak, V.N. Shevchenko, N.A. Nikitina, V.M. Ostrovskaya, Ya.A.Bondarenko, Yu.V. Kholin T

Statistical 3s- and t-criteria were applied earlier in spectrophotometry of solutions to detect deviations from additivity of absorption in unseparated mixtures of analytes. In this work the use of these criteria was extended on testing additivity of analytical signals in solid phase spectrophotometry, diffuse reflectance spectroscopy, and colorimetry. The additivity of analytical signals was checked at the determination of total content of transition metals with the use of six test systems (four indicator papers with covalently grafted formazans and sorptionally fixed 1-(2-pyridilazo)-2-naphthol as well as two indicator gelatin films with immobilized 4-(2-pyridilazo)-resorcinol and 1‑nitroso-2-naphthol-3,6-disulfonic acid). No significant differences from additivity were detected for the analytical signals from sums of metals present in equal concentrations. The c2 criterion was proposed for testing additivity of total color difference of the mixture of analytes. The empirical criterion based on the visual estimation of determination limits of individual analytes and their sum was shown to be applicable for visual colorimetry.

Key words: sum of metals, reagent indicator paper, gelatin film, additivity of signal, statistical criteria, spectrometry, visual colorimetry.

MOCA, 2013, 8(1) p. 14-23


Publisher:Taras Shevchenko National University, Kiev Ukraine

(Analytical chemistry department at Taras Shevchenko National University, 64 Vladimirskaya STR., Kiev, 01601 UKRAINE)
analysis@univ.kiev.ua, www.achem.univ.kiev.ua, +380-44-2393266

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The journal website: www.moca.net.ua

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