Micelle-mediated extraction

Tani, Hirofumi; Kamidate, Tamio; Watanabe, Hiroto

doi:10.1016/s0021-9673(97)00345-2

Cited by 175 publications

(131 citation statements)

References 66 publications

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“…This result might be related to the presence of the high amount of surfactant, resulting in an increase in the volume of the surfactant-rich phase. In addition, the viscosity of the surfactant-rich phase increases, leading to poor sensitivity [28,29]. At lower Triton X-114 concentrations (below 0.04% w/v), the preconcentration efficiency of the complex was very low, probably due to assemblies that were inadequate to quantitatively entrap the hydrophobic complex [31,32].…”

Section: Effect Of Triton X-114 Concentrationmentioning

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

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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.

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Section: Effect Of Triton X-114 Concentrationmentioning

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

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show abstract

“…In addition, the viscosity of the surfactant-rich phase increases, leading to poor sensitivity. 21,22 At lower Triton X-114 concentrations (below 0.04% v/v), the preconcentration efficiency of the complex was very low, probably due to assemblies that were inadequate to quantitatively entrap the hydrophobic complex. 23 A surfactant concentration of 0.15% (v/v) for Triton X-114 was selected for all further works.…”

Section: Effect Of Triton X-114 Concentrationmentioning

confidence: 99%

“…The effect of additives organic or inorganic on cloud point temperature of micellar solution of surfactants is reported in the literature. 9,22 The incubation time and equilibration temperature above the cloud point were thoroughly optimized. It was desirable to employ the shortest incubation time and the lowest possible equilibration temperature, which compromise completion of the reaction and efficient separation of phases.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Cloud point extraction for the determination of copper in environmental samples by flame atomic absorption spectrometry

et al. 2008

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Recebido em 13/12/06; aceito em 5/7/07; publicado na web em 19/12/07 A simple cloud point extraction procedure is presented for the preconcentration of copper in various samples. After complexation by 4-hydroxy-2-mercapto-6-propylpyrimidine (PTU), copper ions are quantitatively extracted into the phase rich in Triton X-114 after centrifugation. Methanol acidified with 0.5 mol L -1 HNO 3 was added to the surfactant-rich phase prior to its analysis by flame atomic absorption spectrometry (FAAS). Analytical parameters including concentrations for PTU, Triton X-114 and HNO 3 , bath temperature, centrifugation rate and time were optimized. The influences of the matrix ions on the recoveries of copper ions were investigated. The detection limits (3SD b /m, n=4) of 1.6 ng mL -1 along with enrichment factors of 30 for Cu were achieved. The proposed procedure was applied to the analysis of environmental samples.

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“…As an alternative to other preconcentration techniques, CPE uses a small amount of nonflammable and nonvolatile surfactant, instead of organic solvents, in solvent extractions such as liquid-liquid extraction [6]. CPE involves a series of fussy procedures, however, including equilibration, centrifugation, and removal of the surfactant-rich phase, resulting in poor reproducibility and low preconcentration factor.…”

Section: Introductionmentioning

confidence: 99%

Comparison of traditional cloud-point extraction and on-line flow-injection cloud-point extraction with a chemiluminescence method using benzo[a]pyrene as a marker

Song

Hayakawa

et al. 2005

Anal Bioanal Chem

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In this work, using benzo(a)pyrene (BaP) as marker, the analytical merits of on-line flow-injection cloud-point extraction (FI CPE), including preconcentration factor, extraction efficiency, sample throughput, and analysis time were evaluated by use of peroxyoxalate chemiluminescence (CL) detection. Moreover, by detailed discussion of several preconcentration conditions for traditional and on-line FI CPE the advantages of on-line FI CPE became conspicuously apparent. When coupled with separation techniques such as high-performance liquid chromatography (HPLC) or capillary electrophoresis (CE), on-line FI CPE-CL has much potential for analysis of low concentrations of polycyclic aromatic hydrocarbons (PAH) in environmental samples.

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Micelle-mediated extraction

Cited by 175 publications

References 66 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

Cloud point extraction for the determination of copper in environmental samples by flame atomic absorption spectrometry

Comparison of traditional cloud-point extraction and on-line flow-injection cloud-point extraction with a chemiluminescence method using benzo[a]pyrene as a marker

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