“…For example, low concentrations of omeprazole were detected in urban and hospital WWTPs as well as in surface and river waters Kosma et al, 2014b;Pedrouzo et al, 2008;Valcárcel et al, 2011). Although, PPIs are not regularly detected, considering their high use (Godman et al, 2009(Godman et al, , 2011Woldegiorgis et al, 2009) its analytical monitoring becomes relevant. In addition, in view of the recent reports dealing with the detection of many metabolites and environmental Transformation Products (TPs) in aqueous samples (Boix et al, 2013(Boix et al, , 2014Boleda et al, 2013;Hernández et al, 2011;Gracia-Lor et al, 2014;Ibáñez et al, 2016;López et al, 2014;Ibáñez et al, 2016), environmental contamination by PPIs should be checked and evaluated more thoroughly.…”