A solvent extraction technique for determining concentrations of gold and silver in natural waters

Chormann, F.H.; Spencer, Mark G.; Lyons, W. Berry; Mayewski, Paul Andrew

doi:10.1016/0009-2541(85)90017-8

Cited by 13 publications

(4 citation statements)

References 21 publications

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“…ETAAS is one of the best methods for the determination of trace metal concentrations because of its established use in the analytical field and good detection limits. It is necessary to combine separation and preconcentration techniques with laboratory instrumentation for reliable determination of trace amounts of gold as a result of its low content in environmental materials [3,4,5,6,7,8,9,10,11,12,13]. There are many preconcentration and separation methods for gold.…”

Section: Introductionmentioning

confidence: 99%

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Determination of trace amounts of gold in acid-attacked environmental samples by atomic absorption spectrometry with electrothermal atomization after preconcentration

et al. 2004

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A method for determination of trace amounts of gold in environmental samples (rocks, soils, sediments, and waters) by atomic absorption spectrometry with electrothermal atomization (ETAAS) after preconcentration using a chelating sorbent Spheron Thiol 1000 is described. The method accurately determines gold between 0.001 and several tens of grams per ton in samples having complex variations in mineralogy. Pulverized samples are roasted at 650 degrees C to oxidize any sulfide and/or carbonaceous material. Samples are then subjected to a series of acid treatments to eliminate any silica matrix and to dissolve the sample. The Spheron Thiol 1000 is added to the sample solution, and then with sorbed gold is filtered out, washed, and ignited at 550 degrees C. The residue is dissolved in aqua regia, evaporated, dissolved in distilled water, transferred to a volumetric flask, and analyzed by ETAAS. The limits of detection of gold, based on the 3 sigma definition, were 0.5 ng g(-1) for 10-g samples (rocks, sediments, soils) and 0.05 ng mL(-1) for 1-L water samples. Precision of determination expressed by the relative standard deviation varied from 2.9% to 16.4%. The accuracy of the method is verified by analysis of certified reference materials. The obtained analytical results are in good agreement with attested values. The developed method was applied for gold determination in environmental samples affected by the acidification (acid mine drainage which is mainly a product of pyrite oxidation) from an open quartzite mine in the Sobov region situated NE of the city of Banská Stiavnica (Slovakia).

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Section: Introductionmentioning

confidence: 99%

“…[3,4,5,6]. One of the known procedures is solvent extraction of gold with methyl isobutyl ketone (MIBK) [7,8,9], dibutyl sulfide (DIS) [10], and amyl acetate [11,12]. Charcoal [14] and activated charcoal with rhodanine [15] are successfully utilized in the preconcentration of gold.…”

Section: Introductionmentioning

confidence: 99%

Determination of trace amounts of gold in acid-attacked environmental samples by atomic absorption spectrometry with electrothermal atomization after preconcentration

et al. 2004

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“…Preconcentration is an important step in the determination of traces of gold in geological materials. 3 Different techniques are available for the preconcentration of gold, including the classical re assay method using various collectors, 4 precipitation and coprecipitation techniques, 5 extraction processes, 6 and sorption approach. 7 The classical re assay method is used for routine laboratory analyses that can accommodate a large sample mass (15-30 g) which reduces the nugget effect, but in general procedural blanks are relatively high.…”

Section: Introductionmentioning

confidence: 99%

Cytosine-functionalized polyurethane foam and its use as a sorbent for the determination of gold in geological samples

et al. 2016

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“…While a variety of techniques for the preconcentration and analysis of Au in natural waters have recently been reported in the literature (7)(8)(9)(10)(11)(12)(13), these do not provide low enough detection limits for the determination of Au in open ocean waters. Koide and co-workers (1) were able to obtain sufficiently low detection limits by preconcentrating 2-L seawater samples via anion exchange of Au chloride complexes followed 0003-2700/90/0362-1477$02.50/0 by uptake of the samples onto single-anion-exchange resin beads.…”

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Determination of gold at femtomolar levels in natural waters by flow-injection inductively coupled plasma quadrupole mass spectrometry

Falkner¹,

Edmond²

1990

Anal. Chem.

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51) Yang. Y.; D'Silva, A. P.; Fassel. V. A. And. Chem. 1981, 53, (52) Dankovic, D. A.; Springer, D. L.; Mnn, D. 6.; Smith, L. G.; ~h~~~, B. L.; Bean, R. M. Carcinogenesis 1989, 10, 789-791. A method for the determination of Au In seawater at femtomolar moi/L) levels Is presented. The technique involves preconcentration by anlon exchange of Au as a cyanide complex, [Au(CN),-1, using lgSAu radiotracer (f,,, = 183 days) to monitor recoverles. Samples are then Introduced by flow injection into an Inductively coupled plasma quadrupole mass spectrometer for analysis. The method has a detection limit of 4 0 fM for 4 L of seawater preconcentrated to 1 mL and a relative preclslon of 15 % at the 100 fM level. With slight modifications, It can also be applied to the analysis of hydrothermal flulds and freshwaters. Koide and co-workers have recently reported concentrations of Au in Pacific seawater samples on the order of 100 f M (I). Using the analytical method described here, we have independently confirmed levels of 10-100 f M Au in seawater a t Atlantic and Pacific Ocean and Mediterranean Sea locations

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A solvent extraction technique for determining concentrations of gold and silver in natural waters

Cited by 13 publications

References 21 publications

Determination of trace amounts of gold in acid-attacked environmental samples by atomic absorption spectrometry with electrothermal atomization after preconcentration

Determination of trace amounts of gold in acid-attacked environmental samples by atomic absorption spectrometry with electrothermal atomization after preconcentration

Cytosine-functionalized polyurethane foam and its use as a sorbent for the determination of gold in geological samples

Determination of gold at femtomolar levels in natural waters by flow-injection inductively coupled plasma quadrupole mass spectrometry

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