Quantitative trace analysis of surfactant mixtures by reversed-phase high-performance liquid chromatography with refractometric detection

Adsorption of Pure Nonionic Alkylethoxylated Surfactants down to Low Concentrations at a Silica/Water Interface as Determined Using a HPLC Technique

“…The equilibrium concentrations in the supernatant (C eq As far as the standards differing by the ethoxylated chain length are concerned (the C 12 E n series), the adsorbed quantiin mol/L) were determined for each of the standards by integration of the areas below the peaks of the chromato-ties at very small surface coverage depend upon the length of the polar chain at least above a critical value of n: the grams using linear calibrations and the corrected factor F when C o was below 100 ppm (19). The quantities adsorbed longer the chain, the larger the adsorption (Fig.…”

Polydispersity of a Non-ionic Surfactant as Related to Its Adsorption Characteristics on Porous Silica Particles in Water

“…The detailed HPLC technique used as well as the full analysis of the surfactant has been described previously (15). Briefly summarized, the apparatus consisted in a GOLD system (Beckman, USA), a C 8 reversed phase column (ultrasphere, Beckman) an acetonitrile/water mobile phase, and a differential refractometer (model RID-6A, Shimadzu, Japan).…”

“…The surfactants are of the type used in today's detergency formulations. The particular HPLC technique used enabled us to determine trace amounts of the various oligomers (down to the ppb region) (15). Distribution of alkyl chains and polar chains had to be characterized.…”

Development of an analytical procedure for the measurement of nonionic aliphatic polyethoxylated surfactants in raw wastewater

“…The AAE mixtures denoted by A and C were gifts from Lever-France (Hambourdin, France). These mixtures were quantitatively analyzed in terms of both alkyl and ethylene oxide chain lengths by Desbène [22]: A is a mixture of C 13 and C 15 homologs; C consists of even homologs ranging from C 10 to C 16 ; both mixtures contains oligomers ranging from 1 to 25 ethylene oxide units and their average degree of ethoxylation is 7. For method development, a mixture of even and odd homologs was prepared by mixing A and C in equal proportions.…”

“…For method development, a mixture of even and odd homologs was prepared by mixing A and C in equal proportions. This new sample denoted by A + C contains about 120 individual AAEs and, from Desbène's data [22], its percentage weight distribution is accurately known.…”