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Sladkov, Vladimir; Осипова, Е. А.

doi:10.1023/a:1026715411687

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…Figure 4 shows the current-voltage curves for the electrooxidation of gold deposits from the graphite electrode (GE) surface. The sensitivity of gold determination by the SV method can be significantly increased when modifying the GE surface by organic or inorganic modifiers, such as bismuth(III) [29], tosylate salts of aryldiazonium [30], polyethylene polyimine [31], acrylic polyelectrolyte [32], and ε-Caprolactam [33].…”

Section: Determination Of Gold(iii) Ions By Stripping Voltammetrymentioning

confidence: 99%

Determination of Au(III) and Ag(I) in Carbonaceous Shales and Pyrites by Stripping Voltammetry

Kolpakova

Sabitova

Sachkov³

et al. 2019

Minerals

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Techniques of stripping voltammetry (SV) determination of silver and gold in pyrites and carbonaceous matter are developed. The problem of quantitative transfer of the analytes into the solution is solved. For this purpose, the ore matrix of carbonaceous shales was decomposed by mineral acids in autoclaves at high pressures. The element to be determined from the sample matrix was separated by extraction. Ag(I) ions from the solutions were extracted in the form of a dithizonate complex in CCl4. Au(III) ions were extracted by diethyl ether. The extracts were decomposed thermally. The dry residue was dissolved in the background electrolyte, and the element was determined by the SV method. The graphite electrode (GE) impregnated with polyethylene was used as a working electrode in the SV determination of silver. The SV determination of gold was carried out using a GE modified by bismuth. The limits of detection (LOD) of Ag(I) and Au(III) contents were equal to 0.016 mg L−1 and 0.0086 mg L−1, respectively. The results of SV determination of gold and silver in standard samples, pyrites, and carbonaceous shales were presented. The silver content in the pyrite was 13.6 g t−1, and in carbon shale it was 0.34 g t−1. The concentration of gold in the pyrite of the Kirovsko–Kryklinskaya ore zone was 1.15 g t−1, while in carbonaceous shales it was 2.66 g t−1. The obtained data were consistent with the data of atomic emission spectroscopy (AES) and inductively-coupled plasma mass spectrometry (ICP–MS). The error of determination of elements by stripping voltammetry was calculated as ranging from 10 to 6 g t−1 (less than 12%) in pyrite and carbonaceous material when determining the silver content, and from 1 to 3 g t−1 (less than 22%) when determining the gold content in pyrite and carbonaceous matter.

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Section: Determination Of Gold(iii) Ions By Stripping Voltammetrymentioning

confidence: 99%

Determination of Au(III) and Ag(I) in Carbonaceous Shales and Pyrites by Stripping Voltammetry

Kolpakova

Sabitova

Sachkov³

et al. 2019

Minerals

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“…Currently, the graphite electrodes are modified to reduce the LOD and the systematic error of SV-determination of the elements [27]. Various metals [28,29] and organic compounds [30][31][32][33] are used as modifiers.…”

Section: Introductionmentioning

confidence: 99%

Determination of Au(III) and Ag(I) in Carbonaceous Shales and Pyrites by Stripping Voltammetry

Kolpakova¹,

Sabitova²,

Sachkov³

et al. 2018

Preprint

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Techniques of stripping voltammetry (SV) determination of silver and gold in pyrites and carbonaceous matter were developed. The problem of quantitative transfer of the sample into the solution was solved. For this purpose, the ore matrix of carbonaceous shales was decomposed by mineral acids in autoclaves at high pressures. The element to be determined from the sample matrix was separated by extraction. Ag(I) ions from the solutions were extracted in the form of dithizonate complex in CCl4. Au(III) ions were extracted by diethyl ether. The extracts were decomposed thermally. The dry residue was dissolved in the background electrolyte, and the element was determined by the SV method. The graphite electrode (GE) impregnated with polyethylene was used as a working electrode in SV–determination of silver. SV–determination of gold was carried out using GE modified by bismuth. The limits of detection (LOD) of Ag(I) and Au(III) contents were equal to 0.016 mg L-1 and 0.0086 mg L-1, respectively. The results of SV-determination of gold and silver in standard samples, pyrites and carbonaceous shales were presented. The silver content in the pyrite was 13.6 g t-1, in carbon shale—0.34 g t-1. The concentration of gold in the pyrite ore zone "Kirovsko–Kryklinskaya" was 1.15 g t-1; in carbonaceous shales—2.66 g t-1. The obtained data were consistent with the data of atomic emission spectroscopy (AES) and inductively coupled plasma mass spectrometry (ICP—MS). The error of determination of elements by stripping voltammetry was calculated when determining the silver content of 10...6 g t-1 in pyrite and carbonaceous material, which was less than 12%, and when determining the gold content of 1...3 g t- 1 in pyrite and carbonaceous matter, which was less than 23%.

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“…Sladkov and Osipova used stripping voltammetry for the determination of silver(I) in the presence of copper(II). 2 They utilized a water-soluble complexing polymer, polyethylenimine, to avoid the interference from intermetallic interaction with a large excess of copper(II). However, their method was not applicable for the cases where copper(II) existed over 1000 times more than silver(I).…”

Section: Introductionmentioning

confidence: 99%

“…However, their method was not applicable for the cases where copper(II) existed over 1000 times more than silver(I). 2 Flameless atomic absorption spectroscopy (AAS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) are useful for determination of silver(I) in high concentration of copper(II) solution with sufficient sensitivity and selectivity. However, when these instruments are used for on-site analysis of the strongly acidic solution at the circuit board plant to control quality, a scavenger system or a chemical hood is needed to eliminate mist and vapor containing metallic oxides, nitrogen oxides, and strong acids such as sulfuric acid and nitric acid from the atmosphere, which affect the copper thin film on the printed-circuit board.…”

Section: Introductionmentioning

confidence: 99%

Flow Injection Spectrophotometric Determination of Sub-mg dm−3 Silver(I) in a Strongly Acidic Solution Containing Concentrated Copper(II) Using a Pyridylazo Reagent

et al. 2011

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Untitled

Cited by 5 publications

References 3 publications

Determination of Au(III) and Ag(I) in Carbonaceous Shales and Pyrites by Stripping Voltammetry

Determination of Au(III) and Ag(I) in Carbonaceous Shales and Pyrites by Stripping Voltammetry

Determination of Au(III) and Ag(I) in Carbonaceous Shales and Pyrites by Stripping Voltammetry

Flow Injection Spectrophotometric Determination of Sub-mg dm−3 Silver(I) in a Strongly Acidic Solution Containing Concentrated Copper(II) Using a Pyridylazo Reagent

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