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)
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Potentiometric sensors for determination of high-molecular polyvinylpyrrolidone

 T.S. Chmilenko, E.V. Matorina, F.A. Chmilenko

The possibility of using associates polyvinylpyrrolidone (PVP, Mr≈3,6·10⁵) with organic reagents and triple metal - polymer complexes (TMPC) as an electrode -active substances (EAS) of membrane of potentiometric sensors had been shown. The conditions of synthesis of EAS of  polyvinylpyrrolidone sensors (рН, ratio of components) had been described. The polymer matrix absorbs water (for 70% ) and PVP ( the concentration varies from 1,5·10^-5 to 6,0·10^-7 in solution) . The morphology of the surface of the PVC-membrane in the reflected and transmitted light had been researched (the average pore diameter is 3,5-5,0 mcm). The linear intervals of electrode function (pC 4-7) and coefficients of selectivity for this sensors in relation to PVP (Mr ≈4,0∙10⁴, Ksel=1·10^-2)  and polydiallyldimethilammonium chloride (Mr ≈ 3,0∙10⁵, Ksel=1·10^-2), to inorganic (Na+, K+, Mg²⁺, Cl-, SO₄^2-, PO₄^3-, Ksel=3·10^-3) and an organic components (urea, oxalic acid, succinic acid, citric acid and glucose, Ksel=3·10^-2) of  biofluid.. The performance of the engineered sensors: pH range 4-6, response time 1-2 min, conditioning for 24 ours, lifetime – 12 month).  Determination of the PVP contain are conducted in model diluted solutions of bioliquid (urine, Sr=0,08) and sewage of pharmaceutical enterprise, Sr=0,03.

Keywords: organic reagent, polyvinylpirrolidon, triple metal - polymer complex, associate, potentiometric sensor

MOCA, 2013, 8(2) pp.63-71