concentration platinum pre

Strong anionic exchangers find wide applications in the sample pre-treatment for separation and concentration of platinum metals [7], [16], [17], [18]. Regarding the exclusively low concentrations of platinum and palladium in the environmental samples (ng/g, pg/g) the anionic exchangers appear to be preferable to the cationic exchange …

Determination of the Platinum‐Group Elements and Gold in Twenty Rock Reference Materials by Inductively Coupled Plasma‐Mass Spectrometry (ICP‐MS) after …

See the Platinum price per ounce & Platinum price per gram to understand your purchasing power. ... Pre-1933 U.S. Gold Coins. How Much Your Platinum is Worth. Enter your amounts. Spot Price. ... The concentration of most of the world's platinum in one small region creates risk. In 2023, South Africa experienced serious electrical grid ...

The energy levels and electrically active concentrations of platinum in silicon have been measured by Hall techniques. Analysis shows platinum to have two electrically active sites. The usual site NPtI (assumed to be substitutional) predominates (>80%) and has two levels, a donor at Ev +0·28 eV, degeneracy γI+ =2 in p -type material and an ...

Pt and Pd concentrations in samples collected in summer and in winter were compared, with concentrations ranging from 205 to 1445 ng g-1 for Pt and from 201 to 1230 ng g-1 for Pd. Graphical AbstractMesoporous silica microparticles (μPs) functionalized with quarternary amino groups were used for isolating platinum and palladium from aqueous ...

On the mining side, with the correct combination of variables, implementing DMS as a pre-concentration step can reduce cut-off grades and, as a result, increase ore reserves. ... Jones, L., and Lawrence, S.R. Pre-concentration of platinum group and base metal ores by dense medium separation. Advances in Mineral Processing Science and Technology

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Determination of platinum group elements (PGEs), especially platinum and palladium in environmental samples is an object of great interest, due to the increase of …

The oxygen reduction reaction (ORR) was studied using a rotating disk electrode. The kinetic current density (cd) at 0.7 V RHE was reduced by more than a factor of 10 on pre-reduced Pt and a factor of 2.5 on pre-oxidised Pt when comparing ORR rate for pure sulphuric acid to that in 0.18 M H 2 SO 4 + 0.1 M NH 3 solution which was the …

A method was developed for ultra-trace determination of all six platinum group elements (PGE) by inductively coupled plasma-mass spectrometry (ICP-MS).With involvement of Fe to the fusion charge compositions of the conventional NiS fire assay, a whole assay button in water may disintegrate into powder and then be dissolved with HCl. The insoluble …

Optimization of furnace temperature program is necessary for the determination of platinum using ETAAS. Hence, the effect of pyrolysis and atomization temperatures on the absorbance signal of 10 ng mL −1 of platinum before and after pre-concentration using the proposed VC-CPE was studied and these results are shown in …

Pre-concentration of precious metal and base metal ore types is becoming more relevant with the discovery, development and operation of many lower grade deposits around the world. The fluctuations in metal prices expose many mines to risks especially dealing with low and variable ore grades. Pre-concentration, the process of concentrating the …

Platinum group elements (PGE) and Au data in polymetallic oceanic ferromanganese nodule reference samples and crust samples obtained by inductively coupled plasma mass spectrometry (ICP-MS), after separation and pre-concentration by nickel sulfide fire-assay and Te coprecipitation, are presented. By optimizing several …

Strengths/Concentrations: 50 mg/50 mL (1 mg/mL) 100 mg/100 mL (1 mg/mL) 200 mg/200 mL (1 mg/mL) ... Cisplatin is contraindicated in patients with a history of allergic reactions to cisplatin or other platinum-containing compounds. ... Pre Treatment Hydration: Patients should be adequately hydrated before and for 24 hrs. after …

The platinum-group elements (PGE) and gold have been determined in twenty international rock reference materials by inductively coupled plasma-mass spectrometry (ICP-MS) after pre-concentration by a nickel sulfide fire assay. It was possible to achieve determination limits for a 50 g sample that ranged from 1 pg g-1 (Rh) to 23 pg g-1 (Au ...

Ceci indique que la méthode proposée peut être utilisée pour la détermination des concentrations à l'état de traces des EGP dans les échantillons géologiques. References Asif M. and Parry S.J. ( 1989 ) Elimination of reagent blank problems in the fire-assay pre-concentration of the platinum-group elements and gold with a nickel ...

Nickel sulfide fire assay improved for pre-concentration of platinum group elements in geological samples: a practical means of ultra-trace analysis combined with inductively coupled plasma-mass spectrometry - …

An example of how the typical U-shaped profile of the substitutional platinum concentration is obtained from one-sided diffusion during annealing at 800 C (simulations). ... The complexes and pre ...

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Platinum. Article. Pre-concentration and Determination of Platinum (IV) in Water Samples Using Chelating Resin by Inductively Coupled Plasma Atomic Emission …

Fire assay is a classical method used for the separation of platinum group elements and gold (PGE + Au) by pre-concentration with a collector. In the nickel sulphide fire assay, nickel and sulphur are used for the collection of PGE + Au. We have successfully reduced the mass of the collectors used without affecting element recovery.

Platinum group metals (PGMs) are considered critical raw materials, thus their recycling and re-use is of outmost importance. Among the PGMs, platinum (Pt), palladium (Pd) and rhodium (Rh) are the basic metals used in catalytic converters. ... pretreatments, such as reduction or pre-concentration, have been avoided in this novel …

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Cisplatin is a medication used to manage and treat solid tumors and hematologic malignancies. It is in the alkylating agent class of cytotoxic medications. This activity reviews the indications, action, and contraindications for cisplatinum as a valuable agent in treating malignancy. This activity will highlight the mechanism of action, adverse …

Accurate and precise determination of platinum group elements (PGEs) at ppb concentrations in geological samples is important but problematic. This paper reports an improved analytical method for the determination of Pt, Pd, Ru, Ir and Rh at sub-ppb levels by isotope dilution-inductively coupled plasma mass spectrometry (ID-ICP-MS). …

Abstract. Mining and plant disciplines can benefit from pre-concentration of UG2 platinum ores in a dense medium separation (DMS) plant. The main benefit of DMS is the selective discard of waste from the feed stream, thus improving project economics while reducing the power and water requirements for processing.

Ashing was applied as a pre-concentration method for Pt content in biological material (e.g. Schäfer et al., 1998). ... Platinum concentrations in estuaries can both derive from natural sources including rock leaching and weathering (Upper Continental Crust Pt content of 2.6 pmol.g −1; ...

The rapid increase of the substitutional platinum concentration is first seen in the profile at time t 2 at the surface with the Pt-silicide layer, i.e., at the origin of the depth scale. As soon as the interstitial platinum atoms …

To use more common and more affordable techniques, a preconcentration step is necessary to increase their concentration to a measurable value. An overview of the application of preconcentration techniques and an overview of the current …

Accepted 12 May 2012. ABSTRACT: A chelating resin is prepared by condensation polymerization of aniline with formaldehyde and characterized by FT-IR, elemental …

Determination of Platinum-Group Elements in Geological Samples by Isotope Dilution-Inductively Coupled Plasma-Mass Spectrometry Combined with Sulfide Fire Assay Pre-concentration Article Full-text ...