Selective cloud point extraction and preconcentration of trace amounts of silver as a dithizone complex prior to flame atomic absorption spectrometric determination

Manzoori, Jamshid L.; Karim‐Nezhad, Ghasem

doi:10.1016/s0003-2670(03)00343-x

Cited by 114 publications

(57 citation statements)

References 19 publications

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“…Because ionic Ag is not extractable when certain chelating agents are added, the speciation of Ag NPs and ions can be achieved by measuring both total Ag and Ag NP concentration [15]. The reported values of limit of detection (LOD) for CPE are generally in the sub μg kg −1 range, although a LOD as low as 0.6 ng kg −1 has been reported for waste water sample by using electrothermal atomic absorption spectrometry [14][15][16]. However, studies have shown that the extraction efficiency was significantly reduced when Ag NPs were coated with proteins, which limits its application in biological samples [17].…”

Section: Introductionmentioning

confidence: 99%

Capillary electrophoresis coupled with inductively coupled mass spectrometry as an alternative to cloud point extraction based methods for rapid quantification of silver ions and surface coated silver nanoparticles

Mudalige

Linder

2016

Journal of Chromatography A

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Speciation and accurate quantification of ionic silver and metallic silver nanoparticles are critical to investigate silver toxicity and to determine the shelf-life of products that contain nano silver under various storage conditions. We developed a rapid method for quantification of silver ions and silver nanoparticles using capillary electrophoresis (CE) interfaced with inductively-coupled plasma mass spectrometry (ICPMS). The addition of 2-mercaptopropionylglycine (tiopronin) to the background electrolyte was used to facilitate the chromatographic separation of ionic silver and maintain the oxidation state of silver. The obtained limits of detection were 0.05 μg kg −1 of silver nanoparticles and 0.03 μg kg −1 of ionic silver. Nanoparticles of varied sizes (10-110 nm) with different surface coating, including citrate acid, lipoic acid, polyvinylpyrrolidone and bovine serum albumin (BSA) were successfully analyzed. Particularly good recoveries (>93%) were obtained for both ionic silver and silver nanoparticle in the presence of excess amount of BSA. The method was further tested with six commercially available dietary supplements which varied in concentration and matrix components. The summed values of silver ions and silver nanoparticles correlated well with the total silver concentration determined by ICPMS after acid digestion. This method can serve as an alternative to cloud point extraction technique when the extraction efficiency for protein coated nanoparticles is low.

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Section: Introductionmentioning

confidence: 99%

Capillary electrophoresis coupled with inductively coupled mass spectrometry as an alternative to cloud point extraction based methods for rapid quantification of silver ions and surface coated silver nanoparticles

Mudalige

Linder

2016

Journal of Chromatography A

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“…This is one of the advantages of CIAME compared to CPE. In case of CPE, the extraction system is destroyed in the presence of over 3% water-miscible organic solvents (Manzoori et al, 2003). Even in case of DLLME based on common organic solvents like chloroform, carbon tetrachloride, etc., the extraction efficiency was clearly reduced for solutions containing water-miscible organic solvents.…”

Section: Effect Of Salt Concentration and Water-miscible Organic Solvmentioning

confidence: 99%

Cold-Induced Aggregation Microextraction: A Novel Sample Preparation Technique Based on Ionic Liquids for Preconcentration of Cobalt Prior to Its Determination by Fiber Optic-Linear Array Detection Spectrophotometry in Real Water Samples

Gharehbaghi¹,

Shemirani²,

Farahani³

et al. 2011

Ionic Liquids: Applications and Perspectives

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“…Cloud point extraction (CPE) by phases of nonionic surfactants (NS) is a selective and a friendly biological-environmental method for separation and preconcentration [6][7][8] . CPE method has been successfully employed for the preconcentration of metal ions [9][10][11][12] and organic compounds such as polycyclic aromatic hydrocarbons [13][14][15] , polychlorinated compounds 16 , vitamins [17][18][19] , dyes [20][21][22] and biomaterials 23 .…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric Determination of Trace Amounts of Eosin B Dye after Cloud Point Extraction

Shokrollah

Malekhosseini²

2013

Chem Sci Trans

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Cloud point extraction (CPE) was carried out to extract Eosin B dye from aqueous solution using non-ionic surfactant Triton x-114. The enrichment of dye was determined by a spectrophotometric study. The effects of different operating parameters, e.g., concentrations of surfactant, salt, temperature, pH, the heating time, equilibration temperature and time of centrifuge have been studied. The extracted surfactant-rich phase was diluted with ethanol and its absorbance was measured at 533 nm. The calibration curve was linear in the range of 0.0067-0.7300 mgL -1 with r 2 =0.995. The detection limit, preconcentration and enrichment factor were obtained 1.08 ng mL -1 , 15.00 and 11.20, respectively. The effect of some foreign species including cations, anions and similar dye, fluorescein was also investigated. This method was applied successfully for determination of the amount of Eosin B in water samples.

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Selective cloud point extraction and preconcentration of trace amounts of silver as a dithizone complex prior to flame atomic absorption spectrometric determination

Cited by 114 publications

References 19 publications

Capillary electrophoresis coupled with inductively coupled mass spectrometry as an alternative to cloud point extraction based methods for rapid quantification of silver ions and surface coated silver nanoparticles

Capillary electrophoresis coupled with inductively coupled mass spectrometry as an alternative to cloud point extraction based methods for rapid quantification of silver ions and surface coated silver nanoparticles

Cold-Induced Aggregation Microextraction: A Novel Sample Preparation Technique Based on Ionic Liquids for Preconcentration of Cobalt Prior to Its Determination by Fiber Optic-Linear Array Detection Spectrophotometry in Real Water Samples

Spectrophotometric Determination of Trace Amounts of Eosin B Dye after Cloud Point Extraction

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