Ultrasound-assisted extraction of gold and silver from environmental samples using different extractants followed by electrothermal-atomic absorption spectrometry

Calle, Inmaculada de la; Cabaleiro, Noelia; Costas, Marta; Pena, Francisco José Ribadas; Gil, Sandra; Lavilla, Isela; Bendicho, Carlos

doi:10.1016/j.microc.2010.07.011

Cited by 43 publications

(5 citation statements)

References 38 publications

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“…However, this fact may be as the consequence of the reality that almost every tributary of the Elbe produces an increase in the Ag content, and Ag is derived from the photochemical factory in the upper part of the river and local photographic plants in the interior (Borovec 1996). Our results of Ag in river sediments are in agreement with those results being reported worldwide with most values being <3 mg kg −1 (De La Calle et al 2011;Ayrault et al 2010;Blaser et al 2008;Sindern et al 2007).…”

Section: Applicationssupporting

confidence: 90%

“…Different analytical techniques such as inductively coupled plasma mass spectrometry (ICP-MS) (Li et al 2007), inductively coupled plasma optical emission spectrometry (ICP-OES) (Vaisanen et al 2002), or electrothermal atomic absorption spectrometry (ETAAS) (De La Calle et al 2011;Lopez-Garcia et al 2003) have been used for determination of trace amounts of Ag in geological and environmental samples. While ICP-OES does not have the necessary sensitivity for ultra-trace analysis (Vaisanen et al 2002), ICP-MS is still not available in most analytical laboratories performing routine analyses because of the high cost of the instrumentation.…”

Section: Introductionmentioning

confidence: 99%

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Direct electrothermal atomic spectrometric determination of Ag in aqua regia extracts of soils, sediments, and sewage sludge with matrix modification

Urbanová

Husáková

Šrámková

2012

Environ Monit Assess

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Silver is subject to significant interferences caused by high chloride concentrations in electrothermal atomic absorption spectrometry, thus its direct determination in aqua regia leaches from soils, sediments, and sludges is very difficult, especially when using instrumentation equipped with deuterium-lamp background correction (D2). In this study, the interference of the aqua regia medium was successfully eliminated using Pd-citric acid chemical modifier. This chemical modifier was found to be the most advantageous in comparison with Pd mixture with ascorbic acid, tartaric acid, or citric acid-Li based on its ability to suppress the interference originating from different chloride matrix. Palladium increases the analyte stability; citric acid serves as a reducing reagent, and furthermore, it helps to remove the interfering chlorides by forming HCl, in the drying step of the electrothermal program. In the presence of the modifier, the pyrolysis temperature can be adjusted up to 1,000 °C with no loss of the analyte. The obtained limit of detection and characteristic mass were 5 ng g(-1) and 1.7 pg, respectively. The accuracy of the method was verified by means of six different reference samples and by comparing the results of the analysis of real samples with those obtained by inductively coupled plasma orthogonal acceleration time-of-flight mass spectrometer. The proposed method was applied to the Ag determination in soils, sediments, and sewage sludge samples from the Pardubice region in Czech Republic.

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Section: Applicationssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Direct electrothermal atomic spectrometric determination of Ag in aqua regia extracts of soils, sediments, and sewage sludge with matrix modification

Urbanová

Husáková

Šrámková

2012

Environ Monit Assess

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“…20,21) The results demonstrated that ultrasound pretreatment with sodium hydroxide is a viable extractive metallurgy technique for the processing of refractory gold ores.…”

Section: Effect Of the Naoh Concentrationmentioning

confidence: 95%

Ultrasound-intensified Leaching of Gold from a Refractory Ore

et al. 2016

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The effect of ultrasonic energy on the pretreatment and leaching of gold from the refractory ore was investigated. Firstly, the refractory ore was pretreated with sodium hydroxide under ultrasound. Secondly, the pretreated ore was leached under ultrasound. The leaching ratio of gold decreased with increasing of the ultrasound pretreatment time from 1 to 5 h and the NaOH concentration from 5 to 20 wt%. The ultrasound increased remarkably the leaching ratio of gold when the pretreated ore was subjected to ultrasound leaching. The results showed that the appropriate acoustic power was a requirement during the ultrasound-intensified leaching. The leaching ratio of gold increased with an increasing of NaCN concentration from 6 to 18 kg/t. The results demonstrated that the ultrasound is a viable extractive metallurgy technique in pretreatment and leaching for the refractory gold ores.

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“…35 Therefore, UAE was selected for iodate extraction. At first, the sample (0.1 g of table salt) was accurately weighed and extracted with 5 mL of deionized water by an ultrasound energy corresponding to ultrasonication at 35 kHz for 5 min to leach out the target analyte.…”

Section: Ultrasound-assisted Extractionmentioning

confidence: 99%

A Highly Sensitive and Selective Method for the Determination of an Iodate in Table-salt Samples Using Malachite Green-based Spectrophotometry

et al. 2016

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A simple, rapid, and sensitive malachite green-based spectrophotometric method for the selective trace determination of an iodate has been developed and presented for the first time. The reaction mixture was specifically involved in the liberation of iodine in the presence of an excess of iodide in an acidic condition following an instantaneous reaction between the liberated iodine and malachite green dye. The optimum condition was obtained with a buffer solution pH of 5.2 in the presence of 40 mg L -1 potassium iodide and 1.5 × 10 -5 M malachite green for a 5-min incubation time. The iodate contents in some table-salt samples were in the range of 26 to 45 mg kg -1 , while those of drinking water, tap water, canal water, and seawater samples were not detectable (< 96 ng mL -1 of limits of detection, LOQ) with their satisfied method of recoveries of between 93 and 108%. The results agreed with those obtained using ICP-OES for comparison.

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Ultrasound-assisted extraction of gold and silver from environmental samples using different extractants followed by electrothermal-atomic absorption spectrometry

Cited by 43 publications

References 38 publications

Direct electrothermal atomic spectrometric determination of Ag in aqua regia extracts of soils, sediments, and sewage sludge with matrix modification

Direct electrothermal atomic spectrometric determination of Ag in aqua regia extracts of soils, sediments, and sewage sludge with matrix modification

Ultrasound-intensified Leaching of Gold from a Refractory Ore

A Highly Sensitive and Selective Method for the Determination of an Iodate in Table-salt Samples Using Malachite Green-based Spectrophotometry

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