From multi-residue screening to target analysis of pharmaceuticals in water: Development of a new approach based on magnetic sector mass spectrometry and application in the Nairobi River basin, Kenya

► Environmental analysis of pharmaceutical residues by magnetic sector HRMS. ► New methodology for screening and target analysis without availability of standards. ► Unique data on the occurrence of human pharmaceuticals in river water for Africa. ► Detection of antimalarials and antiretrovirals in the Nairobi River basin, Kenya.