Separation of aliphatic and aromatic acids, aromatic sulfonates, quaternary ammonium compounds, and chelating agents on a reversed-phase column without ion pairing.
Cleaning products contain a wide variety of components. These include inorganic materials, weak acids, anionic surfactants, cationic surfactants, amphoteric compounds, and nonionic materials. The separation of these generally requires the use of multichromatographic modes. A system is developed that would give the maximum information for a cleaning product in a single chromatographic run. With the use of a hydrophobic, high-carbon-loading, and a relatively hydrophobic surface reversed-phase packing, such compounds as aromatic sulfonates, quaternary ammonium compounds, weak acids, nitrilotriacetic acid, ethylenediaminetetraacetic acid, and nonionic materials may be separated in a single run. The mode of separation is considered to be a combination of reversed-phase, ion-suppression reversed-phase, and adsorption chromatography. The separation is made on a YMC-Packl ODS-AQl column (4.6 x 250 mm, 120 angstroms). The separation employs a gradient run starting with 0.01 N H2SO4 for 10 min followed by a gradient for 15 min to 100% acetonitrile and continuing for an additional 5 min with 100% acetonitrile. The flow rate is 1 mL/min, and the separation is monitored at 210 nm.
Skelly
Norman E
NE
Impact Analytical, 1910 West Saint Andrews Road, Midland, MI 48640-2696, USA.