New Approaches to the Cloud Point Extraction: Utilizable for Separation and Preconcentration of Trace Metals

Hagarová, Ingrid; Urík, Martin

doi:10.2174/1573411011666150601204931

Cited by 29 publications

(7 citation statements)

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“…Je to vďaka jeho optimálnym fyzikálnochemickým vlastnostiam, ktorými sú nízka teplota potrebná na vytvorenie zákalu 23-25 °C (čo je zvlášť dôležité pri extrakcii termálne nestabilných kovových chelátov) a vysoká hustota 1,052 g ml -1 (čo uľahčuje fázovú separáciu) 7 . Tento tenzid možno nájsť vo viac ako 80 % publikovaných prác venovaných separácii a prekoncentrácii (ultra)stopových prvkov 8 .…”

Section: Postup Extrakcie S Využitím Teploty Zákalu Micelárnych Roztokovunclassified

“…Zatiaľ čo vo svojich začiatkoch boli jednotlivé kroky CPE postupov takmer identické a aplikované väčšinou na environmentálne vody (často sa líšili iba sledovaným analytom a použitým kompexotvorným činidlom), v súčasnosti možno nájsť v literatúre niekoľko typov inovovaných CPE postupov 8 , ktoré sú často využívané pri analýze komplexnejších matríc, a to biologických tekutín 30 , potravinových vzoriek 31 alebo rôznych tuhých environmentálnych materiálov (buď po výluhu alebo po rozklade) 32 . Niektoré zaujímavé aplikácie inovovaných CPE postupov budú uvedené v časti 6.5.…”

Section: Spojenie Extrakcie S Využitím Teploty Zákalu Micelárnych Roz...unclassified

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Cloud Point Extraction Combined with Electrothermal Atomic Absorption Spectrometry

Hagarová

2022

Chem. Listy

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Nowadays, a considerable number of various separation/preconcentration procedures coupled with electrothermal atomic absorption spectrometry (ETAAS) can be found in the published literature. Among separation techniques, cloud point extraction (CPE) has found its regular use in ultratrace analysis of elements. This review offers a more detailed look to the coupling of CPE and ETAAS, especially to the parameters affecting ETAAS quantification of a selected element. Publications, where this combination of separation technique and quantification method is used, describe an achievement of quantitative extraction recoveries, an acceptable precision and low limits of quantification (LOQs) for different (ultra)trace elements in various complex matrices. These results lead to the conclusion that the developed procedures have a great analytical potential for reliable quantification of (ultra)trace elements, even when complicated matrices containing various components are to be analyzed, which is supported by papers mentioned in this review.

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Section: Postup Extrakcie S Využitím Teploty Zákalu Micelárnych Roztokovunclassified

Section: Spojenie Extrakcie S Využitím Teploty Zákalu Micelárnych Roz...unclassified

Cloud Point Extraction Combined with Electrothermal Atomic Absorption Spectrometry

Hagarová

2022

Chem. Listy

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“…In recent years, Cloud point extraction (CPE) has become widely utilized for separation and preconcentration of trace metals (Hagarová & Urik 2006). The metal may be in ionic form or in the form of hydrophobic chelates which are formed in certain reactions under suitable conditions.…”

Section: Cpe Applicationmentioning

confidence: 99%

Cloud Point Extraction as a Method for Preconcentration of Metal Ions

Hasić

Horozić

2020

J. eng. process. manag.

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Cloud point extraction (CPE) is an attractive technique that reduces solvent con- sumption and exposure, disposal costs, and process time. This method has an im- portant practical application and is used to separate and concentrate the analyte as a step before its determination, and after the formation of a poorly water-soluble complex. Use of nonionic surfactants as ”green solvents” which represent an effec- tive alternative to toxic organic solvents (in classical extraction), along with other advantages, such as low cost and low flammability, makes this method attractive and worth further research and optimization. This paper presents a detailed de- scription of the principles, procedure, advantages, disadvantages and application of CPE.

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“…From an instrumental perspective, atomic spectroscopy and spectrometry are well suited for the measurement of Pb. The determination of Pb in environmental matrices has been reported by AA, GFAAS, ICP-OES and ICP-MS [8]. With the exception of ICP-MS, the other instrumental approaches are often plagued with a lack of sensitivity to meet environmental protection regulations which translates into mandatory sample preconcentration steps.…”

Section: Introductionmentioning

confidence: 99%

Determination of Pb in environmental samples after cloud point extraction using crown ether

Blanchet-Chouinard

Larivière

2018

Talanta

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In the present study, a new cloud point extraction methodology based on the selective preconcentration and the extraction of stable lead in acidic conditions with 4',4''(5'')-di-tert-butyldicyclohexano-18-crown-6 as a chelating agent was developed, optimized and validated. A mixture of Triton X-114 as non-ionic surfactant and CTAB as cationic surfactant was used to produce micellar structures that incorporate the chelating agent. Phase separation, induced by coacervation, was achieved by increasing the temperature of the system above the cloud point temperature. Pb extraction efficiency was maximized through an optimisation process where the effect of each parameter (i.e. non-ionic and ionic surfactant concentrations, pH, chelating agent concentration and cloud point temperature) on the chemical recoveries of Pb was assessed. Under optimum experimental conditions, the method reaches recoveries greater than 67% for Pb in a variety of complex matrices. In order to facilitate the quantification of Pb by plasma based instrumentations, a back-extraction procedure using aqueous solution of ammonium citrate were performed on the surfactant rich phase in order to reduce the effects on sample introduction and non-spectral interferences. LOD and LOQ of 0.8µgL and 2.6µgL, respectively, were determined by ICP-OES for the complete procedure. Using the back-extraction approach, a preconcentration factor of 39 was achieved for an initial sample volume of 195mL. The ruggedness of the methodology was validated by determining Pb concentration in various environmental and biological samples.

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New Approaches to the Cloud Point Extraction: Utilizable for Separation and Preconcentration of Trace Metals

Cited by 29 publications

References 0 publications

Cloud Point Extraction Combined with Electrothermal Atomic Absorption Spectrometry

Cloud Point Extraction Combined with Electrothermal Atomic Absorption Spectrometry

Cloud Point Extraction as a Method for Preconcentration of Metal Ions

Determination of Pb in environmental samples after cloud point extraction using crown ether

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