Electrothermal atomic absorption spectrometric determination of gold by vapor formation and in situ trapping in graphite tubes

Gold was determined in ore samples following generation, separation, collection on a graphite cuvette inner wall, and atomization of its volatile species formed by combining an acidified sample solution with an aqueous sodium tetrahydroborate solution at room temperature. A detection limit of 2.6 mug L-1 (3sigma) was obtained with a 5.0 mL sample volume. Precision of replicate measurements was typically 10% RSD. The overall efficiency of the volatile species generation, transport, and trapping process was 0.4%. Atomization of gold from Pd, Ir, Cu, Ag, and W coated graphite cuvettes, following by trapping of the gaseous volatile gold species on these surfaces, has been investigated. Pd coating was found to decrease the sensitivity. Five mug of Ir, 20 mug of Cu, 20 mug of Ag, and 5 mug of W were chosen as optimum masses. W treatment was the best one for sensitivity enhancement, having an improvement factor of 2.4. Silanization of glass surfaces significantly decreased memory effects; improved peak shapes were thus obtained for flow injection vapor generation atomic absorption spectrometry (FI-VGAAS). The method described in this study was used for the determination of gold in an ore reference material, Gold Ore (MA-1b), Canadian Reference Materials Program.


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Ertaş, Gülay; Ataman, Osman Yavuz (2006-04-01)
A vapor generation procedure for the production of volatile species of An was studied using electrothermal atomic absorption spectrometry (ETAAS). The interference effects of iron in solution and in the gas phase in a quartz T-tube were studied for the first time in detail. A dual vapor generation system was used for a single heated quartz tube atomizer, so that it was possible to study interferences and classify them regarding their origins. Results show that both gas-phase and liquid-phase interferences a...
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Analytical performances of metal coated slotted quartz tube flame atomic absorption spectrometry (SQT-FAAS) and slotted quartz tube in situ atom trapping flame atomic absorption spectrometry (SQT-AT-FAAS) systems were evaluated for determination of Bi. Non-volatile elements such as Mo, Zr, W and Ta were tried as coating materials. It was observed that W-coated SQT gave the best sensitivity for the determination of Bi for SQT-FAAS and SQT-AT-FMS. The parameters for W-coated SQT-FAAS and W-coated SQT-AT-FAAS ...
KARSH, H; Çulfaz, Ali; YUCEL, H (Elsevier BV, 1992-07-01)
Sorption properties of silicalite-1 samples of pure silica form for some parafinic and aromatic hydrocarbons of different molecular sizes were investigated. It was observed that sorption rates and apparent equilibrium capacities for critically sized molecules, m-xylene and o-xylene, depend on the sorption history of the sample. Sorption of m- and o-xylene proceeded extremely slowly on fresh samples of silicalite-1, whereas sorption rates of these molecules on silicalite-1 samples that had passed through a p...
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Dügencili, Başak; Ataman, Osman Yavuz; Department of Chemistry (2015)
A novel method for determination of bismuth is proposed where the analyte is converted to its hydride form, BiH3, followed by head space preconcentration on a single aqueous drop; final detection was done using electrothermal atomic absorption spectrometry (ETAAS). The preconcentration step was named as headspace single-drop microextraction (HS-SDME). Experimental parameters for hydride generation using both continuous flow and batch technique, ETAAS and finally HS-SDME were optimized. For HS-SDME, Pd, Ni, ...
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The extraction of refractory gold from pyrite concentrate by hydrochloric acid pressure oxidation was investigated on laboratory scale. The aim was for direct solubilization of refractory gold by chloride pressure-leaching without cyanidation.
Citation Formats
G. Ertaş and O. Y. Ataman, “Electrothermal atomic absorption spectrometric determination of gold by vapor formation and in situ trapping in graphite tubes,” APPLIED SPECTROSCOPY, pp. 1243–1250, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32134.