scholarly journals Evaluation of a rapid technique for the determination of precious metals in geological materials based on an aqua regia leach

1993 ◽  
Author(s):  
C J B Gowing ◽  
P J Potts
Keyword(s):  
Precious Metals ◽  
Aqua Regia ◽  
Geological Materials ◽  
Rapid Technique

scholarly journals The determination of the content of gold and silver in geological samples

2001 ◽  
Vol 66 (1) ◽  
pp. 45-52 ◽  
Author(s):  
N. Petrovic ◽  
D. Budjelan ◽  
S. Cokic ◽  
B. Nesic
Keyword(s):  
Graphite Furnace ◽  
Precious Metals ◽  
Atomic Absorption Spectrophotometry ◽  
Assay Method ◽  
Determination Limit ◽  
Geological Samples ◽  
Aqua Regia ◽  
Fire Assay ◽  
Content Of Gold

Amethod has been elaborated for the determination of the content of gold and silver in geological samples by atomic absorption spectrophotometry (AAS) in combination with the fire assay method. The weight of sample used for analysis was 10 g. Sulphur present as sulphide, which is an undesirable element in smelting, was removed by the addition of iron to the charge. The sample was smelted with fluxes and lead oxide to replace the silver and gold by lead and to transfer non-precious elements to slag. Lead was separated from precious metals by cupellation. The separated silver and gold alloy was dissolved with aqua regia with addition of hydrochloric acid in excess. Silver and gold were determined from the same solution. For determination of the silver content, the AAS method with an air-acetylene flamewas used. Goldwas determined in a graphite furnace with the addition of a matrix modifier in an argon current, at an atomization temperature of t = 2200 ?C. The lower determination limit for silver was 0.05 g/t and for gold 0.005 g/t. The results of the analysis for silver and gold obtained with the proposed method showed good agreement with the results of the analysis of the same samples with the fire assay method.

Selectivity coefficients of some simple and complex inorganic ions for Spheron DEAE

1984 ◽  
Vol 49 (10) ◽  
pp. 2349-2354 ◽  
Author(s):  
František Vláčil ◽  
Karel Koňák
Keyword(s):  
Ion Exchange ◽  
Mobile Phase ◽  
Dynamic Method ◽  
Precious Metals ◽  
Inorganic Ions ◽  
Chromatographic Determination ◽  
Chloride Ions ◽  
Chloro Complexes ◽  
Selectivity Coefficients

The selectivity coefficients of the nitrate and chloride ions and of anionic chloro complexes of Au(III), Rh(III), Pd(II), and Pt(IV) for ion exchange on Spheron DEAE in the chloride form are determined by the dynamic method. the complex anion species formed are identified and the ion exchange nature of the sorption of precious metals on this sorbent is confirmed based on the elution order of the precious metals as determined previously by the column chromatography on Spheron DEAE using hydrochloric acid as the mobile phase. The effect of the presence of perchlorate in the mobile phase during the liquid chromatography of precious metals and during the chromatographic determination of nitrate traces is explained.

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