Electrothermal Atomic Absorption Spectrometric Determination of Gold by Vapor Formation and in Situ Trapping in Graphite Tubes

$29.00 plus tax (Refund Policy)

Buy Article:

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 μg L–1 (3σ) 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 μg of Ir, 20 μg of Cu, 20 μg of Ag, and 5 μg 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.

Keywords: ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY; ETAAS; GOLD; IN SITU TRAPPING; VAPOR FORMATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702042335948

Affiliations: Department of Chemistry, Middle East Technical University, Ankara, 06531 Turkey

Publication date: October 1, 2004

More about this publication?
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more