M.Sc. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: In this study, the selective and simultaneous separation and pre-concentration of Cu(II), Ni(II) and Pb(II) from aqueous solutions by carrier element free coprecipitation (CEFC) method before their spectrophotometric determinations have been evaluated. From the obtained results, it was seen that 2-{4-[2-(1H-Indol-3-yl)ethyl]-3-(4-chlorobenzyl)-5-oxo- 4,5-dihydro-1H-1,2,4-triazol-1-yl}-N-(pyrrol-2-ylmethyliden)acetohydrazide (T1) can be used as an organic coprecipitant for the selective separation and pre-concentration Cu(II) and Ni(II) by CEFC method at pH 8.0, and 2-{3-(4-Methylbenzyl)-4-[2-(1H-indol-3-yl)ethyl]-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl}-N-(phenylmethylene)acetohydrazide (T2) can be used for Pb(II) and Cu(II) at pH 7.0. For optimization of the developed methods, the effects of some experimental parameters such as pH, coprecipitant amount, sample volume, standing time, centrifugation rate and time were evaluated on the recovery of analyte ions. The interference effects of some anions and cations, which may present in the environmental samples together with the analyte ions, were examined. In order to evaluate the analytical performance of developed methods the detection limits (LODs), limit of quantification (LOQs) and relative standard deviations (RSD) were determined. For accuracy of method, spike tests were performed and the certified reference materials were used. The developed method were applied to environmental water and food samples, analyte ions were identified by using atomic absorption spectrophotometric method.
Key Words: Trace element, separation and preconcentration, coprecipitation, carrier element free coprecipitation
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