Cloud Point Extraction as a Procedure of Separation and Pre‐Concentration for Metal Determination Using Spectroanalytical Techniques: A Review

Bezerra, Marcos Almeida; Arruda, Marco Aurélio Zezzi; Ferreira, Sérgio Luís Costa

doi:10.1080/05704920500230880

Cited by 378 publications

(119 citation statements)

References 78 publications

Supporting

Mentioning

115

Contrasting

Unclassified

Order By: Relevance

“…The small volume of the surfactant-rich phase obtained with this methodology permits the design of extraction schemes that are simpler, cheaper, more highly efficient and more environmentally friendly than those extractions that use organic solvents. Cloud point methodology practical application of surfactants in analytical chemistry has been used to separate and preconcentrate analyte compounds as a step prior to their determination after the formation of sparingly water-soluble complexes [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Development of efficient method for preconcentration and determination of copper, nickel, zinc and iron ions in environmental samples by combination of cloud point extraction and flame atomic absorption spectrometry

et al. 2009

View full text Add to dashboard Cite

A cloud point extraction procedure for the preconcentration of copper, nickel, iron and zinc ions in various samples has been described. Analyte ions in aqueous phase are complexed with 3-((indolin-3-yl)(phenyl)methyl)indoline (IYPMI) and following centrifugation quantitatively extracted to the aqueous phase rich in Triton X-114. The surfactant-rich phase was dissolved in 2.0 mol L−1 HNO3 in methanol prior to metal content determination by flame atomic absorption spectrometry (FAAS). The effects of some parameters including, the concentrations of IYPMI, Triton X-114 and HNO3, bath temperature, centrifuge rate and time were investigated on the recoveries of analyte ions. At optimum conditions, the detection limits of (3 SDb m−1) of 1.6, 2.8, 2.1 and 1.1 ng mL−1 for Cu2+, Fe3+, Ni2+ and Zn2+ along with preconcentration factors of 30 and enrichment factor of 48, 39, 34 and 52 for Cu2+, Ni2+, Fe3+ and Zn2+ respectively, were obtained. The proposed cloud point extraction has been successfully applied for the determination of metal ions in real samples with complicated matrix such as biological, soil and blood samples with high efficiency.

show abstract

Section: Introductionmentioning

confidence: 99%

Development of efficient method for preconcentration and determination of copper, nickel, zinc and iron ions in environmental samples by combination of cloud point extraction and flame atomic absorption spectrometry

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Spectra were recorded as follows: UV/Vis spectra on a Jasco V-670 spectrophotometer, IR spectra in KBr pellets on a Bruker Alpha-P IR spectrometer in the range of 4000-400 cm -1 , 1 H, 13 C, COSY and HSQC NMR spectra on a Bruker Avance 500 MHz NMR spectrometer. LDI-ToF mass spectrometry experiments were performed using Bruker Autoflex Speed time-of-flight mass spectrometer equipped with a SmartBeam II laser (355 nm; laser impulse energy was approx.…”

Section: Methods and Techniquesmentioning

confidence: 99%

“…The use of thiazolylazo reagents in procedures involving extraction (liquid-liquid or cloud point) is based on the high solubility of these compounds in organic solvents. But unfortunately azo dyes and their chelate complexes with metallic ions are only partially soluble or insoluble in aqueous solution [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural characterization and thermal studies of a novel reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol

Tupys

Kalembkiewicz

Ostapiuk

et al. 2016

J Therm Anal Calorim

View full text Add to dashboard Cite

A new thiazolylazo reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol has been synthesized via arylation of acrolein and further diazotization and diazocoupling with 2-naphthol. The chemical structure of the compound was confirmed by IR, NMR: 1 H, 13 C, COSY, HSQC and SALDI-MS spectral data. The DSC method was employed to determine the melting point and the enthalpy of fusion (T fus = 159.7°C and DH fus = 28.0 kJ mol -1 , respectively). Thermal stability and decomposition studies of the obtained azo dye were performed in air and nitrogen atmosphere using the TG technique. The evolved gases from the heated sample were registered on FTIR spectra. The decomposition of the azo dye in air atmosphere occurred in five consecutive stages. The pK a ionization constants of the substance were determined in ethanol-water mixture (1:1 v/v) by means of the spectroscopic method and were found to be equal to 0.41 for pK a1 and 9.59 for pK a2 . Using the spectrophotometric procedures, the methods for determination of trace amounts of toxic metallic ions with the new reagent were characterized and limits of detection were calculated.

show abstract

“…13−19 The advantages and limitations of this technique have been summarized in recent reviews. 20,21 The mixed micellemediated extraction (mixed-MME) system is becoming an important and practical application of the use of surfactants in analytical chemistry. 22,23 Mixed-MME was used to the preconcentration of organic compounds 24 The chromotrope 2R (CTR) (Scheme 1) is a dye derived from the chromotropeic acid and has been used as complexing agent for uranium 30 U(IV) reacts with CTR and form a negative charge complex (ML 2 ) which in the presence of CTAB can subsequently be trapped in the surfactant micelles (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cloud Point Extraction and Spectrophotometric Determination of Uranium (VI) in Water Samples after Mixed Micelle-Mediated Extraction Using Chromotrope 2R as Complexing Agent

Gholivand¹,

Omidi²,

Khodadadian³

2012

Croat. Chem. Acta

View full text Add to dashboard Cite

Abstract. A rapid, selective and sensitive method for the preconcentration and determination of uranium (VI) by cloud point extraction (CPE) was developed. The method was based on the color reaction of 5.00 ng mL −1 uranium (VI) with 1.5×10 −4 mol L −1 of chromotrope 2R in the presence of 0.015 mol L −1 potassium iodide at pH 8 in HEPES buffer and mixed micelle-mediated extraction of complex. The mixture of a nonionic surfactant (0.2 % (v/v) of (Triton X-114) and a cationic (2.0×10−4 mol L −1 of CTAB) was utilized as a suitable micellar medium for preconcentration and extraction of uranium (VI) complexes. Effect of extraction and reaction parameters was studied and optimum parameters were established. The analytical characteristics of the method (e.g. linear range, limit of detection, preconcentration and improvement factors) were obtained. Linearity was obeyed in the range of 0.2−10 ng mL −1 of uranium (VI) with a detection limit of 0.035 ng mL −1 . The diverse ion effect of some anions and cations on the extraction efficiency of target ions was tested. The proposed method was successfully applied for the determination of uranium (VI) in various water samples. (doi: 10.5562/cca1922)

show abstract

Cloud Point Extraction as a Procedure of Separation and Pre‐Concentration for Metal Determination Using Spectroanalytical Techniques: A Review

Cited by 378 publications

References 78 publications

Development of efficient method for preconcentration and determination of copper, nickel, zinc and iron ions in environmental samples by combination of cloud point extraction and flame atomic absorption spectrometry

Development of efficient method for preconcentration and determination of copper, nickel, zinc and iron ions in environmental samples by combination of cloud point extraction and flame atomic absorption spectrometry

Synthesis, structural characterization and thermal studies of a novel reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol

Cloud Point Extraction and Spectrophotometric Determination of Uranium (VI) in Water Samples after Mixed Micelle-Mediated Extraction Using Chromotrope 2R as Complexing Agent

Contact Info

Product

Resources

About