Chemistry / Kimya
Permanent URI for this collectionhttps://hdl.handle.net/11147/4072
Browse
2 results
Search Results
Article Citation - WoS: 28Citation - Scopus: 28Speciation and Preconcentration of Inorganic Antimony in Waters by Duolite Gt-73 Microcolumn and Determination by Segmented Flow Injection-Hydride Generation Atomic Absorption Spectrometry (sfi-Hgaas)(Elsevier Ltd., 2005) Erdem, Aslı; Eroğlu, Ahmet EminA selective matrix removal/separation/enrichment method, utilizing a microcolumn of a chelating resin with SH functional groups (Duolite GT-73), was proposed for the determination of Sb(III) in waters by segmented flow injection-hydride generation atomic absorption spectrometry (SFI-HGAAS). The resin was selective to Sb(III) at almost all pH and acidity values employed, whereas Sb(V) was not retained at all and could be determined after a pre-reduction step with l-cysteine. Spike recoveries were tested at various concentration levels in different water types and were found to vary between 85 and 118%. Accuracy of the proposed methodology was checked by analyzing a standard reference material and a good correlation was found between the determined (13.3 ± 1.1 μg l-1) and the certified value (13.79 ± 0.42 μg l-1). The method was applied to several bottled drinking water samples for antimony determination with and without preconcentration and none of the samples were found to contain antimony above the permissible level (5 μg l-1). The characteristic concentration (the concentration of the analyte corresponding to an absorbance of 0.0044) was 0.55 μg l-1 and the 3 s limit of detection (LOD) based on five times preconcentration was 0.06 μg l-1. The applicability of the microcolumn separation/preconcentration/matrix removal method for flow injection systems was also demonstrated.Article Citation - WoS: 25Citation - Scopus: 25Synthesis and Photophysical Characterizations of Thermal -Stable Naphthalene Benzimidazoles(Springer Verlag, 2011) Erten Ela, Şule; Özçelik, Serdar; Eren, ErsinMicrowave-assisted synthesis, photophysical and electrochemical properties of thermal-stable naphthalene benzimidazoles and naphthalimides are studied in this paper. Microwave-assisted synthesis of naphthalene benzimidazoles provide higher yields than the conventional thermal synthesis. Comparative photophysical properties of naphthalene benzimidazoles and naphthalimides are revealed that conjugation of electron-donating group onto naphthalimide moiety increases fluorescence quantum yields. Fluorophore-solvent interactions are also investigated using Lippert-Mataga equation for naphthalimides and naphthalene benzimidazoles. Thermal stabilities of naphthalene benzimidazoles are better than naphthalimides due to increased aromaticity. The experimental ELUMOlevels of naphthalene benzimidazoles are found to be between 3.15 and 3.28 eV. Therefore, naphthalene benzimidazole derivatives consisting of anchoring groups are promising materials in organic dye sensitized solar cells.