Preconcentration and matrix separation of precious metals in geological and related materials using metalfix-chelamine resin prior to inductively coupled plasma mass spectrometry

Coedo, Aurora Gómez; Dorado, M. T.; Padilla, Isabel; Alguacil, Francisco José

doi:10.1016/s0003-2670(96)00549-1

Cited by 53 publications

(22 citation statements)

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“…Due to the anionic nature of the gold (III)-chloro complex, the use of anionic exchangers (and also chelating resins) on the adsorption of this precious metal had been reported in the literature [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In the present work, the adsorption and elution of gold (III) from hydrochloric acid solutions were investigated using the anionic exchange resin Lewatit MP-64.…”

Section: Introductionmentioning

confidence: 99%

“…Among the various separation/concentration steps, the use of liquid-liquid extraction, membrane technologies, carbon adsorption and ion exchange has been described [1][2][3][4][5]. In many cases, the adsorption of a solute in a solid support has the advantage over liquid-liquid extraction or even membrane technologies in that no mixing and settling requirements have to be fulfilled and organic phase loss through entrainment is eliminated, also the use of an intermediate step such as filtration is avoided.Due to the anionic nature of the gold (III)-chloro complex, the use of anionic exchangers (and also chelating resins) on the adsorption of this precious metal had been reported in the literature [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In the present work, the adsorption and elution of gold (III) from hydrochloric acid solutions were investigated using the anionic exchange resin Lewatit MP-64.…”

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confidence: 99%

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Processing of residual gold (III) solutions via ion exchange

2005

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IntroductionWithin the context of gold extraction, the dissolution step of gold-bearing materials is carried out using two main aqueous media: cyanide or chloride solutions, and if the first used the leaching of gold from raw materials, the latter is useful to recover this precious metal from secondary materials and residues, i.e. anode slimes and jewelry scrap. Both dissolution media required both a complexant (cyanide or chloride) and an oxidant (air or nitric acid/chlorine) to achieve acceptable leaching rates and yields.In the particular case of chloride leaching and once gold is dissolved, the metal is presented in the solution as the gold (III)-chloro complex (AuCl4 -) with square planar structure.Very often, and prior to the ultimate gold recovery, a solution purification and/or concentration step is needed in order to produce a higher grade solution. Among the various separation/concentration steps, the use of liquid-liquid extraction, membrane technologies, carbon adsorption and ion exchange has been described [1][2][3][4][5]. In many cases, the adsorption of a solute in a solid support has the advantage over liquid-liquid extraction or even membrane technologies in that no mixing and settling requirements have to be fulfilled and organic phase loss through entrainment is eliminated, also the use of an intermediate step such as filtration is avoided.Due to the anionic nature of the gold (III)-chloro complex, the use of anionic exchangers (and also chelating resins) on the adsorption of this precious metal had been reported in the literature [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In the present work, the adsorption and elution of gold (III) from hydrochloric acid solutions were investigated using the anionic exchange resin Lewatit MP-64. The influence of various parameters affecting the metals adsorption on the resin is studied and a kinetic study to explain the metal uptake is presented, whereas metal elution from the loaded resin is studied using acidic thiourea solutions. The final recovery from the eluates is accomplished by the use of an alkaline borohydride solution. ExperimentalThe ion exchange resin Lewatit MP-64 (Fluka) was used to adsorb gold (III) from hydrochloric acid solutions. Lewatit MP-64 is a macroporous medium-basic anion exchangecrosslinked polystyrene matrix resin containing tertiary and quaternary ammonium groups (Cl -form-free base). Prior to its use for gold adsorption, the resin was dry until constant weight. Aqueous Au(III) stock solution was prepared from solid HAuCl4 (Fluka), whereas working solutions were prepared by dilution. Other chemicals used in the present investigation were of AR grade.Batch adsorption (elution) experiments were carried out by mixing (750 min The processing of gold (III)-hydrochloric acid solutions by the anionic ion exchange Lewatit MP-64 resin has been investigated. The influence of several variables such as the temperature, the hydrochloric acid and metal concentrations in the aqueous solution and the variation of the amount of resin ...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Processing of residual gold (III) solutions via ion exchange

2005

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“…Solid phase extraction has been demonstrated to be a highly effective preconcentration method when first applied to spectrometric determination [14,19,20]. Among the different sorbents that were tested for this enrichment stage are resins such as polyacrylacylaminothiourea [21], imidazoline [22], Metalfix-Chelamine [23,24], Amberlite XAD-16 [25], Amberlite XAD-7 [26], Dowex 1-X10 [27], Polyorgs 17 [28], HHY-10A macropore anion resin [29], activated alumina [30] and modified silica gels like silica gel functionalized with 1,5-bis(di-2-pyridyl)methylene thiocarbohydrazide [31], modified silicagel SeparonTM SGX [32], silica gel modified with propylamine groups [33]. Very good sorption properties of this last resin led us to choose it for the present study.…”

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confidence: 99%

Estimation of platinum in environmental water samples with solid phase extraction technique using inductively coupled plasma mass spectrometry

et al. 2009

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A solid phase extraction technique for the determination of platinum(IV) at trace levels by inductively coupled plasma mass spectromA solid phase extraction technique for the determination of platinum(IV) at trace levels by inductively coupled plasma mass spectrometry (ICP-MS) was developed. The method was based on retention of platinum in a sample on silica gel modified with aminepropyl groups. The retention of platinum(IV) from the sample solution and the recovery of platinum with 1.0 mol L−1 thiourea solution were quantitative. The relative standard deviation (RSD) was calculated as 5% (n = 7) at the 10 ng L−1 level. The enrichment factor was found to be (50-fold) for 250 mL of water sample. Under optimum conditions, the method detection limit (MDL) was found to be 1 ng L−1 for platinum in water matrices. Recoveries of Pt from spike addition to atmospheric water samples were quantitative (80–95%). The present method was used for the determination of platinum in precipitation, throughfall and runoff water samples.

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“…10 Combined digestion procedures, a wet acid treatment followed by alkaline oxidizing fusion of an undissolved residue, are often applied for improving the recovery of the metals. [74][75][76] The use of hydrofluoric acid in the digestion procedures is preferable, particularly when examining geological 74,[76][77][78][79][80][81][82][83][84][85] and environmental materials. 72,[86][87][88][89][90][91][92][93][94] High-pressure systems and microwave heating are widely applied for improving the digestion of such samples.…”

Section: Wet Acid Treatmentmentioning

confidence: 99%

“…[74][75][76] Any residue not dissolved in acids is submitted to Na2O2 fusion and, after dissolution, is combined with the main sample. The application of the sodium peroxide fusion procedure for the preparation of an automobile catalyst for the determination of platinum, palladium and rhodium by ICP-MS has recently been examined.…”

Section: Oxidizing Fusionmentioning

confidence: 99%

Sample Digestion Methods for the Determination of Traces of Precious Metals by Spectrometric Techniques

Balcerzak

2002

ANAL. SCI.

162

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Recent advances in digestion methods used in the analysis of precious metal samples by spectrometric techniques are reviewed. The applicability of a fire assay, a wet acid treatment, chlorination and alkaline oxidizing fusion to a quantitative recovery of metals from various materials is discussed. Data on the precious metal contents obtained by using particular digestion methods as well as UV-VIS spectrophotometry, atomic absorption spectrometry, atomic emission spectrometry and inductively coupled plasma mass spectrometry in the examination of various samples are tabulated.

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Preconcentration and matrix separation of precious metals in geological and related materials using metalfix-chelamine resin prior to inductively coupled plasma mass spectrometry

Cited by 53 publications

References 15 publications

Processing of residual gold (III) solutions via ion exchange

Processing of residual gold (III) solutions via ion exchange

Estimation of platinum in environmental water samples with solid phase extraction technique using inductively coupled plasma mass spectrometry

Sample Digestion Methods for the Determination of Traces of Precious Metals by Spectrometric Techniques

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