Simultaneous quantitative trace analysis of anionic and nonionic surfactant mixtures by reversed-phase liquid chromatography

Portet, F.; Treiner, Claude; Desbène, P.L.

doi:10.1016/s0021-9673(00)00225-9

Cited by 20 publications

(12 citation statements)

References 34 publications

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“…The supernatant was analyzed by high-performance liquid chromatography (HPLC) for each surfactant. When the concentrations were high enough, a RID-6A differential refractometer was employed (Touzart and Matignon, France) and the solutions were injected in a System Gold HPLC chromatographic device (Beckman, USA) as described previously …”

Section: Methodsmentioning

confidence: 99%

Self-Desorption of Mixtures of Anionic and Nonionic Surfactants from a Silica/Water Interface

2001

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The adsorption of a mixture of two surfactants, the anionic sodium dodecyl sulfate and the nonionic nonylethylene glycol n-dodecyl ether, from water to a hydrophilic silica dispersion has been studied at pH = 5.0 and 25 °C in a large concentration range at several surfactant compositions by a classical depletion method. The adsorption of the latter compound onto silica induces the incorporation of the former by the formation of mixed surfactant aggregates. However, at high total surfactant concentration, about 100 times the mixed critical micelle concentration, both surfactants are partially desorbed from the silica surface. This behavior is qualitatively interpreted as the consequence of two phenomena: on one hand, the strong interaction between the anionic and the nonionic surfactant in the bulk above the critical micelle concentration and on the other hand the repulsion which occurs between the negatively charged dissociated silanol groups and the anionic surfactant in the mixed aggregates at the silica/water interface. At high total surfactant concentration and above a specific anionic/nonionic surfactant ratio the former phenomenon is favored over the latter, hence the desorption of both surfactants.

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Section: Methodsmentioning

confidence: 99%

Self-Desorption of Mixtures of Anionic and Nonionic Surfactants from a Silica/Water Interface

2001

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“…They play an important role in the medium-dependent reactivity in molecular chemistry [2] and polymerization mechanisms. [3] They are used as interacting reagents in separation techniques (HPLC [4] or capillary electrophoresis [5] ) and are also involved in biphasic processes, such as phase-transfer catalysis [6] or reactive extraction. [7] In liquid-liquid systems quaternary ammonium salts, which are known for their ability to form hydrophobic IPs with organic and inorganic anions in water, are used as anion carriers.…”

Section: Introductionmentioning

confidence: 99%

“…[14] However, a theoretical model based on hard-sphere ions in a solvent of hard multipolar polarizable particles has been developed for some alkali halides and for (C 2 H 5 ) 4 NBr in water. [15] This study found a contact minimum with a depth of approximately 2.2 kcal mol À1 and a very shallow solvent-separated minimum.…”

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confidence: 99%

Amphiphilic Organic Ion Pairs in Solution: A Theoretical Study

2007

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The macroscopic manifestation of hydrophobic interactions for amphiphilic organic ion pairs (tetraalkylammonium-anion) has been shown experimentally by measuring their association constants and their affinity with the organic phase. Beyond a certain size, there is a direct relation between association constants and chain lengths in tetraalkylammonium ions. We propose to cast a bridge between these results and geometrical properties considered at the level of a single ion pair by means of quantum chemistry calculations performed on model systems: trimethylalkylammonium-pentyl sulfate instead of tetraalkylammonium-dodecyl sulfate. Two limiting cases are considered: head-to-head configurations, which yield an optimal electrostatic interaction between polar heads, and parallel configurations with a balance between electrostatic and hydrophobic interactions. All properties (geometries, complexation energies, and atomic charges) were obtained at the MP2 level of calculation, with water described by a continuum model (CPCM). Dispersion forces link hydrocarbon chains of tetraalkylammonium ions and pentyl sulfate, thus yielding (for the largest ion pairs) parallel configurations favored with respect to head-to-head geometries by solute-solvent electrostatic interactions. Given the small experimental association energies, we probe the accuracy limit of the MP2 and CPCM methods. However, clear trends are obtained as a function of chain length, which agree with the experimental observations. The calculated monotonic stabilization of ion pairs when the hydrocarbon chain increases in length is discussed in terms of electrostatic interactions (between ions and between ion pairs and water), dispersion forces, and cavitation energies.

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“…However, determining the chemical composition of a detergent represents an analytical-chemical challenge due to the complex nature of the material, as it is a mixture of nonionic surfactants, ionic surfactants, polymers, low-molecular-mass organic and inorganic ingredients, and in some cases insoluble materials like zeolites and clay (Aboulkassim and Simoneit, 1993;Hoyt et al, 1979). Reported analytical methods typically focus on a single component, e.g., nonionic surfactants, and rely on chromatographic methods such as high-performance liquid chromatography (HPLC) (Abrar and Trathnigg, 2010;Mico-Tormos et al, 2008;Portet et al, 2000), capillary electrophoresis (Sebastiano et al, 2004), and gas chromatography (GC) (Silver and Kalinoski, 1992), or on mass spectrometry (MS) methods such as MALDI (Bartsch et al, 1998;Sato et al, 2001Sato et al, , 2003 or electrospray ionization -mass spectrometry (Cassani et al, 2004;Ogura et al, 1996;Pratesi et al, 2006). NMR is an extremely powerful analytical method for both qualitative and quantitative analysis of complex mixtures, as illustrated with the developments of NMR applications in the field of metabolomics (Emwas et al, 2013;Fan and Lane, 2016) and its subfield lipidomics (Li et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Rapid and Simple Identification and Quantification of Components in Detergent Formulations by Nuclear Magnetic Resonance Spectroscopy

Hansen

Damhus

Brask

2019

J Surfact & Detergents

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A rapid, inexpensive, and simple high‐resolution NMR spectroscopic method is outlined for determining the content of surfactants and other low‐molecular‐weight organic compounds in detergent formulations. With simple sample preparation, quantitative results can be obtained from an internal standard and/or the method can be used as a fingerprint analysis of the surfactant composition. The NMR sample is prepared by suspending the detergent sample in deuterated acetic acid and thus dissolving surfactants and other organic compounds. Any content of carbonate will be liberated as CO2, whereas other inorganic materials are removed by centrifugation. From one‐dimensional 1H and two‐dimensional HSQC NMR spectra, the surfactant components and low‐molecular‐weight organic compounds can be identified from reference spectra. Intensities of signature signals in the one‐dimensional 1H NMR spectrum are used for quantification by comparing with an internal standard. Furthermore, it is demonstrated how 31P NMR can be used to identify and quantify phosphonate‐type chelators.

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Simultaneous quantitative trace analysis of anionic and nonionic surfactant mixtures by reversed-phase liquid chromatography

Cited by 20 publications

References 34 publications

Self-Desorption of Mixtures of Anionic and Nonionic Surfactants from a Silica/Water Interface

Self-Desorption of Mixtures of Anionic and Nonionic Surfactants from a Silica/Water Interface

Amphiphilic Organic Ion Pairs in Solution: A Theoretical Study

Rapid and Simple Identification and Quantification of Components in Detergent Formulations by Nuclear Magnetic Resonance Spectroscopy

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