Author(s): Petrovic M, Tavazzi S, Barcelo D
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Abstract A novel methodology based on column switching LC-MS, using restricted access material (RAM), for an integrated sample clean-up and analysis of endocrine disrupting compounds in sediment samples is described. The use of RAM precolumns, that combines size exclusion and reversed-phase retention mechanisms, enables fast on-line clean-up of sediment extracts and sensitive determination of alkylphenolic compounds, bisphenol A and steroid sex hormones at low ppb level (LODs=0.5-5 ng/g). Different LiChrospher ADS RAM precolumns (Merck, Germany) with C4, C8 and C18, respectively, modification of inner pore surface were tested. ADS C4 precolumns gave the best results in terms of recovery, selectivity and sensitivity, eliminating efficiently matrix components and consequently reducing ion suppression effects. Except for the most polar compounds, all compounds exhibit complete recovery with RSD from 0.87 to 15\%. A complete analysis, including efficient pressurized liquid extraction (PLE) of target compounds, on-line clean-up, chromatographic separation and MS detection takes approximately 2 h, which is a significant improvement in comparison to the methods reported previously.
This article was published in J Chromatogr A
and referenced in Pharmaceutica Analytica Acta