Determination of Anionic-Active Detergents by Two-phase Titration

Reid, V. W.; Longman, G. F.; Heinerth, E.

doi:10.1515/tsd-1967-040903

Cited by 268 publications

(33 citation statements)

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“…Probably the most common analysis method for anionic surfactants is Epton's two-phase titration method 209,210 or one of its variations. 211, 212 Related, single-phase titrations can be performed and monitored by either surface tension 213 or surfactant-sensitive electrode 200,201,214,215,216 measurements. Endpoints have also been detected by turbidity and refractive index changes.…”

Section: Analysis For Surfactantsmentioning

confidence: 99%

2 Surfactants and their applications

Schramm

Stasiuk

Marangoni

2003

Annu. Rep. Prog. Chem., Sect. C: Phys. Chem.

558

323

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Surfactants form a unique class of chemical compounds. This review provides an introduction to the nature and physical properties of surfactants, emphasizing their ability to radically alter surface and interfacial properties and to self-associate and solubilize themselves in micelles. These properties provide the means to apply surfactants in wettability modification, detergency, and the displacement of liquid phases through porous media on one hand, and to stabilize dispersions (including foams, froths and emulsions), or to destabilize dispersions (again including foams and emulsions) on the other hand. These in turn lead to a vast array of practical application areas which are illustrated in terms of mineral and petroleum processing, biological systems, health and personal care products, foods, and crop protection.

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Section: Analysis For Surfactantsmentioning

confidence: 99%

2 Surfactants and their applications

Schramm

Stasiuk

Marangoni

2003

Annu. Rep. Prog. Chem., Sect. C: Phys. Chem.

558

323

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“…The volume fractions of supernatant (φ sup ) and sediment (φ sed ) were determined from height measurements (see Figure S1). The equilibrium concentration of the free surfactant in the supernatant was determined using the two-phase Epton titration involving Hyamine 1622 as a cationic titrant . A 1 mL portion of supernatant was pipetted into a 100 mL stoppered mixing cylinder.…”

Section: Methodsmentioning

confidence: 99%

“…The equilibrium concentration of the free surfactant in the supernatant was determined using the two-phase Epton titration involving Hyamine 1622 as a cationic titrant. 37 A 1 mL portion of supernatant was pipetted into a 100 mL stoppered mixing cylinder. A 2 mL portion of aqueous indicator solution containing 0.14 mM disulphine blue, 0.21 mM dimidium bromide, and 0.1 mM sulfuric acid was then added followed by 10 mL of Milli-Q water and 15 mL of chloroform.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Aqueous Foams in the Presence of Surfactant Crystals

Binks

Shi

2020

Langmuir

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Aqueous foams are used extensively in many fields and anionic surfactants are commonly used foaming agents. However, potential trouble may arise when they are utilized in hard water areas and/or at low temperatures. Anionic surfactants, like sodium dodecyl sulfate (SDS), may precipitate in the form of crystals when the concentration of divalent counterions such as Mg 2+ exceeds a certain limit. In an attempt to prepare ultra-stable foams containing precipitated crystals, the behaviour of SDS in water was systematically investigated as a function of surfactant concentration at different concentrations of Mg(NO3)2 prior to a study of their foam properties. We quantitatively study the conversion of surfactant micelles to crystals and the redissolution of crystals into micelles. It was found that the presence of surfactant crystals reduced the initial foam volume and foam half-life but greatly improved the long-term stability of foams. Foam studies were also conducted for the supernatant and sediment isolated from crystal dispersions so that the importance of surfactant crystals to foam stability could be established. Despite the foamability of a sediment being low, an order of magnitude increase in foam half-life was related to the coverage of bubble surfaces by surfactant crystals. Both rapid cooling and ultrasonication were shown to influence the surfactant crystal shape and size with an impact on foam properties.

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“…Serum replacement 43 was used to separate the serum from the latex particles to determine the free surfmer content. Serum replacement was performed with a UHP-76 of MicroFiltration Systems, flushing distilled water through in discontinuous mode and the affluent was collected for later analysis of the surfmer concentration, by the two-phase titration method …”

Section: Methodsmentioning

confidence: 99%

Reactive Surfactants in Heterophase Polymerization. 11. Particle Nucleation

et al. 1998

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The nucleation process in the emulsion polymerizations of styrene, methyl methacrylate, and vinyl acetate stabilized by sodium dodecyl sulfopropyl maleate, a polymerizable surfactant (surfmer), was investigated. A nonpolymerizable surfactant, sodium dodecyl sulfate (SDS), was used as a reference. The results obtained suggested that the presence of the surfmer did not affect the nucleation mechanism (which seems to be micellar for styrene and homogeneous for MMA and VAc). The type of surfactant did not affect the dependence of the number of particles upon surfactant concentration for styrene, but the dependence for the surfmer was lower than that for SDS in the cases of MMA and VAc. This was interpreted in terms of formation of water-soluble oligomers that do not participate in the stabilization of the polymer particles.

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Determination of Anionic-Active Detergents by Two-phase Titration

Cited by 268 publications

References 0 publications

2 Surfactants and their applications

2 Surfactants and their applications

Aqueous Foams in the Presence of Surfactant Crystals

Reactive Surfactants in Heterophase Polymerization. 11. Particle Nucleation

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