Cloud-point extraction of selected polycyclic aromatic hydrocarbons by nonionic surfactants

Hung, Kun Chih; Chen, Bing‐Hung; Yu, Liya E.

doi:10.1016/j.seppur.2007.03.004

Cited by 57 publications

(31 citation statements)

References 29 publications

(84 reference statements)

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“…High recoveries and preconcentration factors of PAHs using CPE have been also demonstrated (Bai et al, 2001;Hung et al, 2007;Li and Chen, 2003;Li et al, 2004). The CPE process is mainly based on the clouding phenomena of surfactants, especially that of nonionic surfactants.…”

Section: Introductionmentioning

confidence: 93%

“…Surfactants can increase the solubility of hydrophobic compounds significantly through a process known as solubilization (Li and Chen, 2002;Rosen, 2004). The enhanced solubilization of PAHs in presence of surfactants has been reported considerably (Dar et al, 2007;Grimberg et al, 1994Grimberg et al, , 1995Hung et al, 2007). While much effort has been shown on how to increase the decontamination efficiency by surfactant flushing in soil remediation processes, relatively less attention has been paid on the proper treatment or disposal of the washing solution.…”

Section: Introductionmentioning

confidence: 99%

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Recovering phenanthrene from spiked sand by a combined remediation process of micellar solubilization and cloud-point extraction

Chen

2008

Journal of the Chinese Institute of Chemical Engineers

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Recovering phenanthrene from spiked sand by a combined remediation process of micellar solubilization and cloud-point extraction

Chen

2008

Journal of the Chinese Institute of Chemical Engineers

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“…The cloud point phenomenon causes the emergence of two liquid phases in equilibrium [1]. Thus, it is important to study additive compounds that affect the cloud point of nonionic surfactants, enabling their application at controlled temperatures and their use in extraction processes [2]. Various works about the effect of salts on the cloud point have been presented in the literature.…”

Section: Introductionmentioning

confidence: 99%

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

Araújo

Neto

Chiavone‐Filho

et al. 2015

Rev. Fac. Ing. Antioquia

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In this study, the influence of NaCl on the cloud point of polyethoxylate surfactants from the family of lauryl alcohol polyethoxylates (C 12 EO n ) and nonylphenol polyethoxylates (NPEO n ) was investigated. Liquid-liquid equilibrium curves of the aforementioned aqueous surfactants system with the presence of NaCl were plotted and thermodynamic parameters based on the Flory-Huggins model were obtained. The visual method was used to determine the cloud point. Solutions containing surfactant concentrations between 0.5 and 20% (by weight) and NaCl between 4.9 and 12.1% (by weight) were prepared. Salt had a salting-out effect, decreasing surfactant solubility in water. Furthermore, the cloud point decreased with an increase of NaCl concentration. The Flory-Huggins model satisfactorily described the experimental data for all surfactant + NaCl aqueous mixtures studied. ---------

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“…In most cases, the sorbent is packed in cartridges or disks. However, to avoid the adsorption of PAHs on sample containers or connection tubing, an organic solvent (Tfouni et al 2007) or a surfactant should be added before extraction (Ballesteros-Gomez and Rubio 2009;Pino et al 2002;Hung et al 2007). More recently, solid-phase microextraction (SPME) coupled to liquid chromatography (LC) has been used for determination of PAHs in water (Chen 2004).…”

Section: Introductionmentioning

confidence: 99%

Off-line solid-phase extraction procedure for the determination of polycyclic aromatic hydrocarbons from aqueous matrices

Limam

Driss

2013

Int. J. Environ. Sci. Technol.

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An off-line solid-phase extraction procedure followed by high-performance liquid chromatography with ultraviolet detection for the determination of 16 priority polycyclic aromatic hydrocarbon pollutants in aqueous matrices was described. Diverse aspects determining extraction efficiency such as packing type (disk or cartridge), elution solvents and addition of organic modifiers to the sample were evaluated. Elution with acetonitrile yields the highest recoveries. Rinsing the sample bottle with acetonitrile and combining the rinse with the sample extract avoids the adsorption of polycyclic aromatic hydrocarbons on the walls of the water containers. The use of isopropanol or methanol 10 % (V/V) was the most appropriate amount for the enrichment of 2-to 6-ring aromatic compounds only on C18 cartridge. The recoveries for all studied polycyclic aromatic hydrocarbons are ranged from 71.4 to 95.2 % for a treated water samples of 500 mL. The proposed method gives very low detection limits (subnanograms per liter) and it has been applied to drinking water, surface water and industrial effluent (oil refinery) samples with good results.

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Cloud-point extraction of selected polycyclic aromatic hydrocarbons by nonionic surfactants

Cited by 57 publications

References 29 publications

Recovering phenanthrene from spiked sand by a combined remediation process of micellar solubilization and cloud-point extraction

Recovering phenanthrene from spiked sand by a combined remediation process of micellar solubilization and cloud-point extraction

Influence of sodium chloride on the cloud point of polyethoxylate surfactants and estimation of Flory-Huggins model parameters

Off-line solid-phase extraction procedure for the determination of polycyclic aromatic hydrocarbons from aqueous matrices

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