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Preconcentration of tellurium by mercapto resin micro column and determination by hgaas
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075810.pdf
Date
1998
Author
Körez, Aslıhan
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https://hdl.handle.net/11511/1983
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Graduate School of Natural and Applied Sciences, Thesis
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A simple method for the determination of ultra-trace amounts of germanium in natural waters has been developed. Germanium was preconcentrated using silica having mercapto functional groups, namely mercapto silica and determined by hydride generation flame atomic absorption spectrometry (HGAAS). Utilising mercapto silica, satisfactory recovery values (> 95%) were obtained at natural pH, for germanate concentrations as low as 50 ng 1(-1) Considering the highest preconcentration factor (400-fold) obtained, the...
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The main aim of this study is to combine the sol-gel technology and renewable surface flow injection analysis (RS-FIA) techniques for iron speciation and determination. Thus the home-made FIA system, which consists of 2 syringe pumps and 3 multi-position selection valves, is modified with two flow cells (magnetic cell and jet ring cell) in order to be suitable for renewable surface flow injection technique. All the computer programs used for flow injection analysis are modified to control the whole system a...
PRECONCENTRATION OF SOME TRACE-METALS FROM SEA-WATER ON A MERCAPTO-MODIFIED SILICA-GEL
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Silica modified by the addition of mercapto chelating groups has been developed for the pre-concentration of trace metals from natural waters. This material removes cadmium, copper, lead and zinc from aqueous solution and can be employed for the pre-concentration of these metals by both column and batch techniques. Under column and batch conditions recoveries larger than 95% were common. For batch extractions of cadmium, zinc, copper and lead from sea water, recoveries of 91 ± 5, 98 ± 4, 97 ± 4 and 96 ± 5%,...
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A. Körez, “Preconcentration of tellurium by mercapto resin micro column and determination by hgaas,” Middle East Technical University, 1998.