Publications (3)3.33 Total impact
Article: Interference effect of iron on the determination of gold in geological samples using the vapor generation technique and preconcentration in a graphite furnace.[show abstract] [hide abstract]
ABSTRACT: A vapor generation procedure for the production of volatile species of Au 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 are present. It was also concluded that since the total interference effect causes the Au signal to be lower as compared to only the presence of gas-phase interactions in the experiment, the net liquid-phase interference from Fe should be suppressed. The method described in this study was used for the determination of gold in an ore reference material, Carlin Ore Mine, for the purpose of demonstrating the ability of the reported method to determine Au without any extraction procedure.Applied Spectroscopy 05/2006; 60(4):423-9. · 1.66 Impact Factor
Article: Electrothermal atomic absorption spectrometric determination of gold by vapor formation and in situ trapping in graphite tubes.[show abstract] [hide abstract]
ABSTRACT: 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 microg 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 microg of Ir, 20 microg of Cu, 20 microg of Ag, and 5 microg 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.Applied Spectroscopy 11/2004; 58(10):1243-50. · 1.66 Impact Factor
Article: Studies on analyte transport by ETV and investigations on volatile gold species using in situ trapping in a graphite tube and determination by etaas.[show abstract] [hide abstract]
ABSTRACT: Thesis (Ph. D.).- Middle East Technical University. Department of Chemistry.