Determination of sulfonic acids and alkylsulfates by ion chromatography in water.
A fast ion chromatographic method with suppressed conductivity detection has been developed for the simultaneous determination of methane-, ethane-, 1-propane-, 1-butane-, 1-pentane-, 1-hexane-, 1-heptane-, 1-octane-, 1-nonane-, 1-decane-, 1-dodecane-, dodecylbenzene-, p-toluene-, benzenesulfonic acids, octylsulfate and dodecylsulfate in water samples. Due to the high number of analytes and their heterogeneity, the effect of the mobile phase parameters (NaOH, CH(3)OH and CH(3)CN concentration) on the retention factors has been studied in detail, so achieving, for the first time, the separation among 15 of these analytes by a gradient elution. Detection limits included within 0.06-0.16 microM have been obtained. Interferences from Cl(-), NO(3)(-) and SO(4)(2-), possible anions present in water samples, have been considered and a SPE procedure has been developed for analytes enrichment and matrix removal in a seawater sample. This is the first application of an ion-exchange chromatographic method to a seawater sample for this kind of analytes.
Bruzzoniti
Maria Concetta
MC
Department of Analytical Chemistry, University of Torino, Via P. Giuria 5, 10125 Torino, Italy. mariaconcetta.bruzzoniti@unito.it
De Carlo
Rosa Maria
RM
Sarzanini
Corrado
C
D000838:Anions / Q000737:chemistry; D002852:Chromatography, Ion Exchange / Q000379:methods*; D004553:Electric Conductivity; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry; D012623:Seawater / Q000737:chemistry*; D013451:Sulfonic Acids / Q000032:analysis* / Q000145:classification; D013463:Sulfuric Acid Esters / Q000032:analysis*; D013501:Surface-Active Agents / Q000737:chemistry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis
D000838:Anions; D009930:Organic Chemicals; D013451:Sulfonic Acids; D013463:Sulfuric Acid Esters; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical