Rapid, low pressure, and simultaneous ion chromatography of common inorganic anions and cations on short permanently coated monolithic columns.
Short permanently coated reversed-phase silica based monolithic columns have been investigated for the rapid separation of inorganic anions and cations. One 2.5 x 0.46 cm column was permanently coated with didodecyldimethylammonium (DDAB), for anion analysis; and a second 5.0 x 0.46 cm column was coated with dioctylsulphosuccinnate (DOSS), for cation analysis. The use of a single combined eluent of 2.5 mM phthalate/1.5 mM ethylenediamine, at flow rates of between 4.0 and 8.0 mL/min, resulted in the rapid separation of 8 anions (in under 100 s) and 5 cations (in under 100 s) on the above columns when used individually, with detection limits for common anions ranging from approximately 0.25 to 5 mg/L, and between 2.5 and 50 mg/L for alkaline earth metals, by direct and indirect conductivity detection, respectively. However, with both columns subsequently connected in parallel, with the eluent delivered using a flow splitter from a single isocratic pump, the simultaneous analysis of anions and cations was also possible, based on a single conductivity detector. The potential of this system for the rapid, complete screening of water samples for multiple common anions and cations is shown.
Connolly
Damian
D
National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland.
Victory
Danielle
D
Paull
Brett
B
D000838:Anions / Q000032:analysis*; D002412:Cations / Q000032:analysis*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D004143:Dioctyl Sulfosuccinic Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D011312:Pressure; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013997:Time Factors; D014867:Water / Q000032:analysis / Q000737:chemistry
D000838:Anions; D002412:Cations; D007477:Ions; D000644:Quaternary Ammonium Compounds; D014867:Water; D004143:Dioctyl Sulfosuccinic Acid; C046112:didodecyldimethylammonium