Browsing by Author "Dayyih, Waell A.A."

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    Nitrate-selective electrodes based on the trinuclear chromium(III) pivalates [Articol]
    (Institute of Chemistry of ASM, 2008) Revenco, Mihail; Martin, Mariana; Dayyih, Waell A.A.
    The paper describes the analytical potentialities of the trinuclear chromium(III) complexes as potentiometric ionophores for the construction of electrodes sensitive to the presence of nitrate anion. The electroactive material containing 4,4’-bipyridil was synthesized in situ. The membrane was prepared using dioctylphthalate as a solvent mediator and poly (vinyl chloride) as a polymeric matrix. The electrodes presented a slope of 56 mV/decade, a low limit of detection (3,2.10-6 mol/l), an adequate lifetime (4 months), and suitable selectivity characteristics when compared with other nitrate electrodes. The good parameters of this electrode made possible its application to the determination of nitrate in different types of fertilizers.
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    Nitrate-selective electrodes based on the trinuclear chromium(III) pivalates [Articol]
    (Academia de Știinițe a Moldovei, 2008) Revenco, Mihail; Martin, Mariana; Dayyih, Waell A.A.
    The paper describes the analytical potentialities of the trinuclear chromium(III) complexes as potentiometric ionophores for the construction of electrodes sensitive to the presence of nitrate anion. The electroactive material containing 4,4’-bipyridil was synthesized in situ. The membrane was prepared using dioctylphthalate as a solvent mediator and poly (vinyl chloride) as a polymeric matrix. The electrodes presented a slope of 56 mV/decade, a low limit of detection (3,2.10-6 mol/l), an adequate lifetime (4 months), and suitable selectivity characteristics when compared with other nitrate electrodes. The good parameters of this electrode made possible its application to the determination of nitrate in different types of fertilizers.
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    Еlectrod cu matrice polimerică, selectiv la surfactantul anionic laurilsulfat [Articol]
    (CEP USM, 2011) Revenco, Mihail; Dîru, Mariana; Dayyih, Waell A.A.
    A new anionic surfactant sensor has been prepared, based on trinuclear chromium(III) pivalate as sensing material incorporated into the plasticized PVC-membrane. The sensor exhibited Nernstian response (59-61mV/decade) in the region between 10-3-10-5mol/l for dodecylsulfate. The potentiometric selectivity coefficients were determined by fixed interferential method. Application of these electrodes to the analysis of some products containing anionic surfactants has been realized and results have been compared with the two-phase titration method