Abstract
A method was developed for the analysis of a number of surfactants which contained no UV-chromophores, using RP-HPLC with Indirect Photometric Detection, IPD. Pyridinium salts such as N-methylpyridinium iodide, N-methyl-2,2'-dipyridinium iodide and N,N'-dimethyl-2,2'-dipyridinium diiodide, were used as the visualization reagents, forming ion-pair complexes with the sulfonate surfactants. This allowed ordinary UV-detection. N-methylpyridinium iodide proved to be a suitable reagent, both with respect to ease of preparation and response. The eluents consisted of mixtures of acetonitrile and water, being 0.1 - 0.25 mM with respect to pyridinium salt. The method was sensitive and exhibited good signal to noise ratios, as well as linear responses over a wide concentration range. All of the analyzed surfactants were separated, including the diastereomeric forms of some of the surfactants.
Highlights
Many modern surfactants are combinations of alkyl chains and a variety of polyether segments, such as ethyleneoxy units (EO-units)
In studies related to Enhanced Oil Recovery, EOR, and the analysis of the composition of surfactants used for that purpose, our group has been involved with the synthesis of a variety of such surfactants
We have investigated the use of these methods on the surfactants studied in this work
Summary
Many modern surfactants are combinations of alkyl chains and a variety of polyether segments, such as ethyleneoxy units (EO-units). Surfactant / Analysis / Ion-pair detection / HPLC One of the studies concluded that the alkyl moiety should preferably consist of a methyl group [18] as use of longer alkyl groups resulted in variations of the retention time of a system peak as a function of eluent composition. In the development of a HPLC method, detection of 1a-e and 2a-b was studied using a variety of pyridinium iodides, 3- 5, Figure 3.
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