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Gold Analysis after Nanoparticle Adsorption on Quartz Reflectors and Total Reflection X-Ray Fluorescence (TXRF) Analysis (pp. 251-262) $100.00
Authors:  (Nikolaos G. Kallithrakas-Kontos, Ioanna-Nikol I. Aretaki, Technical University of Crete, Analytical and Environmental Chemistry Laboratory, Chania, Greece)
Abstract:
Gold is a precious metal with many technological applications. Total Reflection XRay
Fluorescence (TXRF) is a powerful technique for trace element analysis on flat
surfaces; gold is among the most effectively analysed elements from its L X-ray lines.
Quartz is the most frequent used sample supporter for achieving the Total Reflection
conditions.
A new method for the determination of gold trace levels is presented. The method
has been based on the reduction of gold ions to colloidal nanoparticle suspension; this
suspension was adsorbed on quartz surface and analysed by TXRF. More specifically the
reflectors were immersed in water solutions containing low concentration of gold and
reducing agents were added. By the end of the colloidal adsorption, the reflectors were
removed, cleaned with water, desiccated and analyzed by total reflection X-Ray
fluorescence. Among various reducing reagents (that they were tested), ascorbic acid and
sodium citrate gave the best results. The effects of immersion time and various
experimental parameters were examined. The coexistence of other ions does not interfere
in the analysis process and the method can be applied in all types of water (ASTM type I,
drinking and seawater). Very good linearity in the 1-500 ng.mL-1 gold concentration
range was achieved and the minimum detection limit was estimated in low ppb level. 


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Gold Analysis after Nanoparticle Adsorption on Quartz Reflectors and Total Reflection X-Ray Fluorescence (TXRF) Analysis (pp. 251-262)