Cloud Point Extraction for the Preconcentration of Silver and Palladium in Real Samples and Determination by Atomic Absorption Spectrometry

Tavallali, Hossein; Yazdandoust, Saeed; Yazdandoust, Mozhdeh

doi:10.1002/clen.200900207

Cited by 42 publications

(20 citation statements)

References 26 publications

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“…Several methods including solid phase extraction [5,6], ion exchange [7], cloud point extraction [8,9], electrochemical deposition [10], and coprecipitation [11], etc., have been extensively used for separation and preconcentration of heavy metal ions.…”

Section: Introductionmentioning

confidence: 99%

Preconcentration by Coprecipitation of Copper and Nickel with Mo(VI)/Triazole Derivative System and Their Determinations by Flame Atomic Absorption Spectrometry in Food and Water Samples

Özdeş

Duran

Bayrak

et al. 2011

CLEAN Soil Air Water

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A new separation and preconcentration technique based on coprecipitation of Cu (II) and Ni(II) ions by the aid of Mo(VI)/di-tert-butyl{methylenebis[5-(chlorobenzyl)-4H-1,2,4-triazol-3,4-diyl]}biscarbamate (BUMECTAC) precipitate has been established. The Mo(VI)/ BUMECTAC precipitate was dissolved by concentrated HNO 3 and the solution was completed to 5.0 mL with distilled/deionized water. The levels of the analyte ions were determined by flame atomic absorption spectrometer. The effects of experimental conditions like HNO 3 concentration, amount of BUMECTAC and Mo(VI), sample volume, etc. and also the influences of some foreign ions were investigated in detail on the quantitative recoveries of analyte ions. The preconcentration factors were found to be 40 for Cu(II) and 100 for Ni(II) ions. The detection limits for Cu(II) and Ni(II) ions based on 3s (N:10) were 0.43 and 0.70 mg L À1 , respectively. The relative standard deviations were found to be lower than 4.0% for both analyte ions. The accuracy of the method was checked by spiked/recovery tests and the analysis of two certified reference materials (Environment Canada TM-25.3 and CRM-SA-C Sandy Soil C). The procedure was successfully applied to sea water and stream water as liquid samples and baby food as solid sample in order to determine the levels of Cu(II) and Ni(II) ions.

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Section: Introductionmentioning

confidence: 99%

Preconcentration by Coprecipitation of Copper and Nickel with Mo(VI)/Triazole Derivative System and Their Determinations by Flame Atomic Absorption Spectrometry in Food and Water Samples

Özdeş

Duran

Bayrak

et al. 2011

CLEAN Soil Air Water

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“…There are many sensitive but expensive analytical methods such as electrochemical analysis, 3 inductively coupled plasma mass spectrometry 4 and electrothermal atomic absorption spectrometry. 5 In addition, these instrumental techniques involve complicated processing step. Flame atomic absorption spectrometry (FAAS) method has the advantage of simplicity and does not need expensive or complicated test equipment; however, direct determination of trace amount of silver by FAAS is not possible due to its low sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…To solve this problem, separation / preconcentration procedure prior to determination by FAAS is a popular choice. Several methods for the preconcentration of silver have been proposed, such as cloud point extraction, 5 liquid -liquid extraction,…”

Section: Introductionmentioning

confidence: 99%

Flame Atomic Absorption Spectrometric Determination of Trace Amounts of Silver in Radiological Waste Samples After Solid Phase Extraction Using Multi-Walled Carbon Nano-Tubes Modified by Sodium Dodecyl Sulfate

Kahkha

Kaykhaii

2015

J. Chil. Chem. Soc.

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Multi-walled carbon nano-tubes was modified with sodium dodecyl sulfate and used as a solid phase extraction adsorbent for the determination of trace silver in radiological waste samples by flame absorption spectrometry. The effects of pH, initial silver ion concentration, sample flow rate and volume, elution conditions and the amount of adsorbent on the recovery of the analyte were investigated and optimized. The results showed that silver could be fully adsorbed at pH 7.0 and eluted by 5.0 mL 2% thiourea in HNO 3 (0.1 mol.L -1 ). Under the optimized conditions, the adsorption capacity of modified multi-walled carbon nano-tubes was found to be 3.2 mg.g -1 of silver. The detection limit of the proposed method was 350 µg. L -1 for silver with an enrichment factor of 35. The relative standard deviation for ten replicate measurement of 0.5 μg of silver from 700 mL samples was 4.7%. The analytical procedure was successfully applied to the determination of trace silver in a few radiological waste samples with the recoveries between 94% and 105%. Graphite furnace atomic absorption spectrometric technique was also used for the comparison with the suggested method for the determination of the real samples.

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“…Separation, preconcentration, and determination of Fe(III) and Ni(II) from aqueous solution can be achieved by different techniques such as solvent extraction [5,6], cloud point extraction (CPE) [7][8][9], solid phase extraction [10][11][12][13], and coprecipitation [14][15][16][17]. Among these preconcentration methods, coprecipitation is one of the most efficient separation and enrichment techniques for trace heavy metal ions.…”

Section: Introductionmentioning

confidence: 99%

Coprecipitation with Cu(II)‐4‐(2‐Pyridylazo)‐resorcinol for Separation and Preconcentration of Fe(III) and Ni(II) in Water and Food Samples

Tokalıoğlu

Daşdelen

2011

CLEAN Soil Air Water

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The coprecipitation method is widely used for the preconcentration of trace metal ions prior to their determination by flame atomic absorption spectrometry (FAAS). A simple and sensitive method based on coprecipitation of Fe(III) and Ni(II) ions with Cu(II)-4-(2-pyridylazo)-resorcinol was developed. The analytical parameters including pH, amount of copper (II), amount of reagent, sample volume, etc., were examined. It was found that the metal ions studied were quantitatively coprecipitated in the pH range of 5.0-6.5. The detection limits (DL) (n ¼ 10, 3s/b) were found to be 0.68 mg L À1 for Fe(III) and 0.43 mg L À1 for Ni(II) and the relative standard deviations (RSD) were 4.0%. The proposed method was validated by the analysis of three certified reference materials (TMDA 54.4 fortified lake water, SRM 1568a rice flour, and GBW07605 tea) and recovery tests. The method was successfully applied to sea water, lake water, and various food samples.

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Cloud Point Extraction for the Preconcentration of Silver and Palladium in Real Samples and Determination by Atomic Absorption Spectrometry

Abstract: , respectively. The method has been successfully applied to evaluate these metals in some real samples, including waste water, soil and hydrogenation catalyst samples.

Cited by 42 publications

References 26 publications

Preconcentration by Coprecipitation of Copper and Nickel with Mo(VI)/Triazole Derivative System and Their Determinations by Flame Atomic Absorption Spectrometry in Food and Water Samples

Preconcentration by Coprecipitation of Copper and Nickel with Mo(VI)/Triazole Derivative System and Their Determinations by Flame Atomic Absorption Spectrometry in Food and Water Samples

Flame Atomic Absorption Spectrometric Determination of Trace Amounts of Silver in Radiological Waste Samples After Solid Phase Extraction Using Multi-Walled Carbon Nano-Tubes Modified by Sodium Dodecyl Sulfate

Coprecipitation with Cu(II)‐4‐(2‐Pyridylazo)‐resorcinol for Separation and Preconcentration of Fe(III) and Ni(II) in Water and Food Samples

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