Liquid chromatography–tandem mass spectrometry analysis of estrogenic compounds in coastal surface water of the Baltic Sea

An alternative method for the determination of estrogens in surface water and wastewater treatment plant effluent using pre-column trimethylsilyl derivatization and gas chromatography/mass spectrometry

“…As a result, it is difficult to obtain good reproducibility using C 18 cartridge. In comparison, Oasis HLB cartridge was a very good choice because of its hydrophobic and hydrophilic groups, which were more beneficial for enrichment of steroid estrogen (Benijts et al 2004;Hernando et al 2004;Beck et al 2005;Peck et al 2007). Acidity of water sample would change the distribution of target substances between water and cartridge.…”

Distribution of endocrine disruptors in the Mondego River estuary, Portugal

“…Afterwards, the cartridges were kept under vacuum aspiration, for 30 min, to dry out residual water. The elution process, was performed with 20 mL of CH 2 Cl 2 : CH 3 OH (50:50, v/v), nonetheless, since the extracts from the estuarine water samples had a dark and sticky appearance, a cleanup step based in anterior protocols (Quintana et al 2004;Beck et al 2005), was implemented for the current assays (Ribeiro et al 2007). Here, all extracts were quantitatively transferred to the 1 g Sep-Pak silica cartridges, acquired from Waters Corporation (Milford, MA, USA).…”

Analysis of estrogens in environmental waters using polymer monolith in-polyether ether ketone tube solid-phase microextraction combined with high-performance liquid chromatography

“…Several pretreatment methods, such as liquid-liquid extraction (LLE) [17,33], solid-phase extraction (SPE) [3][4][5][6][7][8][23][24][25][26][27][28][29][30][31][32] and stir bar sorptive extraction (SBSE) [10][11][12], have been widely applied to the extraction of EDCs from environmental waters. However, the LLE method demands complex extraction and cleanup procedures, as well as large volumes of sample and organic extractant.…”