Evaluation of a rapid technique for the determination of precious metals in geological samples based on a selective aqua regia leach

The Analyst ◽  
1991 ◽  
Vol 116 (8) ◽  
pp. 773 ◽  
Author(s):  
Charles J. B. Gowing ◽  
Philip J. Potts
Keyword(s):  
Precious Metals ◽  
Geological Samples ◽  
Aqua Regia ◽  
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.

scholarly journals Determination Of Silver In Geological Samples Using Aerosol Dilution ICP-MS After Water-Bath Extraction With Inverse Aqua Regia

2021 ◽  
Vol 42 (6) ◽  
Author(s):  
Yan Wu
Keyword(s):  
Inductively Coupled Plasma ◽  
Signal To Noise Ratio ◽  
Accurate Determination ◽  
Standard Reference Materials ◽  
Geological Samples ◽  
Aqua Regia ◽  
Inductively Coupled ◽  
Traditional Mode ◽  
Plasma Mass Spectrometry

A valid method for trace silver (Ag) detection in geological samples was developed in this study using aerosol dilution inductively coupled plasma-mass spectrometry after extraction with inverse aqua regia. This was proposed primarily to reduce the interference from Nb and Zr during mass spectrometric measurements. Almost 93% of Nb and Zr was removed after the extraction. By mixing an appropriate amount of Ar with the sample aerosol using an aerosol dilution system prior to plasma, the residual Nb oxides and Zr oxides or hydroxides could be successfully removed. The relative yields of the interfering oxides and hydroxides were as low as 0.087% (NbO/Nb) and 0.013% (ZrOH/Zr), which were 3–5 times lower than those in the traditional mode without the addition of Ar. Moreover, the signal-to-noise ratio of Ag was five times higher than that in the traditional mode. The proposed method was applied to the determination of Ag in 68 standard reference materials (SRMs) of soil, sediment, and rock. The results for 47 of these geological SRMs were in good agreement with the reference values. The Ag levels in three SRMs (GSP-2 Granodiorite, STM-2, and SGR-1b) are being reported for the first time herein. For these SRMs, 10 separate aliquots of the sample were digested and analyzed over a period of three months, and analysis revealed that the determined values were reasonable. Thus, the proposed method shows significant potential for the accurate determination of trace Ag in various geological samples.

Determination of cadmium in geological samples by aerosol dilution ICP-MS after inverse aqua regia extraction

2015 ◽  
Vol 30 (9) ◽  
pp. 2010-2016 ◽  
Author(s):  
Qian Xu ◽  
Wei Guo ◽  
Lanlan Jin ◽  
Qinghai Guo ◽  
Shenghong Hu
Keyword(s):  
Direct Determination ◽  
Geological Samples ◽  
Aqua Regia ◽  
Valid Method ◽  
Icp Ms

A valid method is developed based on aerosol dilution ICP-MS after inverse aqua regia extraction for direct determination of trace levels of Cd in geological samples.

Determination of Precious Metals in Geological Samples from Four Gold Ore Deposits of the North-East of Russia

2018 ◽  
Vol 73 (6) ◽  
pp. 539-550 ◽  
Author(s):  
I. E. Vasil’eva ◽  
E. V. Shabanova ◽  
E. M. Goryacheva ◽  
O. T. Sotskaya ◽  
V. A. Labusov ◽  
...  
Keyword(s):  
Precious Metals ◽  
Ore Deposits ◽  
Geological Samples ◽  
Gold Ore ◽  
North East ◽  
The North
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