Determination of Gold by Graphite Furnace Atomic Absorption Spectrometry after Coprecipitation with Nickel Diethyldithiocarbamate

Sato, Hirotoshi; Ueda, Joichi

doi:10.2116/analsci.16.1089

Cited by 20 publications

(11 citation statements)

References 7 publications

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“…In many cases, the usage of a separation and/or preconcentration method is required prior to analysis of the samples in order to improve the sensitivity and accuracy of atomic spectrometric techniques. For this purpose, solvent extraction, 1 ion-exchange, 2,3 electrolytic deposition, 4 vaporization, 5 solid-phase extraction, 6,7 and coprecipitation with phosphates, [8][9][10][11] hydroxides, [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] various dithiocarbamates, [28][29][30][31][32][33] have been proposed for preconcentration and separation of analyte ions from various matrix media. Döner and Ege 34 have investigated for the determination of copper, cadmium and lead in aqueous solutions by flame atomic absorption spectrometry after coprecipitating with aluminum hydroxide.…”

Section: Introductionmentioning

confidence: 99%

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

2008

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A coprecipitation method has been developed for the determination of Cr(III), Mn(II), Fe(III), Co(II), Cu(II), Cd(II) and Pb(II) ions in aqueous samples by flame atomic absorption spectrometry (FAAS) with the combination of pyridine, nickel(II) as a carrier element and potassium thiocyanate as an auxiliary complexing agent. The obtained coprecipitates were dissolved with nitric acid and measured by FAAS. The coprecipitation conditions, such as the effect of the pH, amounts of nickel, pyridine and potassium thiocyanate, sample volume, and the standing time of the precipitate formation were examined in detail. It was found that the metal ions studied were quantitatively coprecipitated with tetrakis(pyridine)-nickel(II)bis(thiocyanate) precipitate (TP-Ni-BT) in the pH range of 9.0 -10.5. The reliability of the results was evaluated by recovery tests, using synthetic seawater solutions spiked with the analyte metal ions. The obtained recoveries ranged from 96 to 101% for all of the metal ions investigated. The proposed method was validated by analyses of two certified reference materials (NIST SRM 2711 Montana soil and HPS Certified Waste Water Trace Metals Lot #D532205). It was also successfully applied to seawater and dialysis solution samples. The detection limits (n = 25, 3s) were in the range of 0.01 -2.44 mg l -1 for the studied elements and the relative standard deviations were £6%, which indicated that this method could fully satisfy the requiremets for analysis of such samples as seawater and dialysis solution having high salt contents.

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Section: Introductionmentioning

confidence: 99%

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

2008

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“…Therefore, a separation and preconcentration stage is often necessary for sensitive and interference-free gold determination. [9][10][11][12] Various techniques have been used for separation and preconcentration of gold from different media, e.g., liquid-liquid extraction, 13 dispersive liquid-liquid microextraction, 14 solid-phase extraction, 15,16 cloud point extraction, 17,18 coprecipitation, 19 electrodeposition, 20 and ion exchange. 21 Modern trends in analytical chemistry are towards the simplification and miniaturization of sample preparation procedures as well as the minimization of solvent and reagent consumption.…”

Section: Introductionmentioning

confidence: 99%

Determination of Gold in Various Environment Samples by Flame Atomic Absorption Spectrometry Using Dispersive Liquid–Liquid Microextraction Sampling

Saçmacı¹,

Kartal²,

Kalkan³

2015

Croat. Chem. Acta

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Abstract.A new dispersive liquid-liquid microextraction separation/preconcentration procedure as a rapid sample-preparation technique is proposed for detection of ultra trace amounts of Au(III) in various media by flame atomic absorption spectrometry using 1,5-diphenyl-1,3,5-pentanetrione as chelating agent. Carbon tetrachloride and methanol were used as extraction and dispersive solvents, respectively. Various parameters that affect the extraction efficiency such as pH, centrifugation rate and time, chelating agent concentration and sampling volume on the recovery of Au(III) were investigated. Under optimum conditions, the enhancement factor of 750, relative standard deviation of 2.7 % and calibration graphs obtained in the concentration range of 0.04-5.6 μg L −1 for gold were obtained. The limit of detection was 1.1 ng L −1 . The accuracy of the method was performed by analysis of the certified reference material (CDN-PGMS-10). The developed method was applied successfully to the determination of gold in the catalytic converter, anode slime, ore and seawater samples. The results show that dispersive liquid-liquid microextraction procedure is sensitive, rapid, simple and safe for the separation/preconcentration of gold from complex sample media.

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“…An effective separation and preconcentration procedure is usually necessary prior to determination. Various preconcentration and separation procedures including coprecipitation (Novgorodova, Generelov, Trubkin, & Ziborova, 1994;Sato & Ueda, 2000), cloud point extraction (Akita, Rovira, Satre, & Takeuchi, 1998;Wongwailikhit, Tasakorn, Prasassarakich, & Aratono, 2003), solvent extraction (Begerow, Turfeld, & Dunemann, 1997;Chowdhury & Kamata, 1997;Zhao, Wu, & Chen, 1999), ion-exchange (Lai et al, 2002) and electroanalytical methods (Komarek & Houserova, 2003) are widely used prior to flame atomic absorption spectrometric determination of gold.…”

Section: Introductionmentioning

confidence: 99%

Solid phase extraction of gold(III) on Amberlite XAD-2000 prior to its flame atomic absorption spectrometric determination

Elçi

Sahan

Basaran³

et al. 2006

Environ Monit Assess

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A solid phase extraction method for the determination of gold(III) at trace levels by flame atomic absorption spectrometer (FAAS) was developed. The method was based on retention of gold as chloro complexes through the Amberlite XAD-2000. The effect of some analytical parameters including hydrochloric acid concentration, sample volume, sample and eluent flow rates, eluent volume, eluent concentration and interfering ions on the recovery of gold(III) was investigated. The retention of gold(III) from 1.5 mol l(-1) HCl solution and the recovery of gold with 0.07 mol l(-1) NH3 solution were quantitative (>or=95%). The relative standard deviation (RSD) was calculated as 3.2% (n = 10). The detection limit for gold was 2 microg l(-1). The accuracy was checked with the determination of gold spiked an artificial seawater and a pure copper samples.

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Determination of Gold by Graphite Furnace Atomic Absorption Spectrometry after Coprecipitation with Nickel Diethyldithiocarbamate

Cited by 20 publications

References 7 publications

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

Determination of Heavy Metals at Sub-ppm Levels in Seawater and Dialysis Solutions by FA AS after Tetrakis(pyridine)-nickel(II)bis(thiocyanate) Coprecipitation

Determination of Gold in Various Environment Samples by Flame Atomic Absorption Spectrometry Using Dispersive Liquid–Liquid Microextraction Sampling

Solid phase extraction of gold(III) on Amberlite XAD-2000 prior to its flame atomic absorption spectrometric determination

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