Distribution of micropollutants in estuarine and sea water along the Portuguese coast.

This work provides the first spatial distribution report of micropollutants (MPs) in the entire Portuguese coast, comprising the ocean shore (sea water, SW) and whenever possible the nearest river discharging on it (estuarine water, EW). This surface water monitoring programme aimed to assess the spatial distribution of 37 MPs with a wide chemical nature, including some substances prioritized by the European Union Directive 39/2013/EU and contaminants of emerging concern targeted in the Watch List of Decisions 495/2015/EU and 840/2018/EU. The risk quotients were estimated in each sampling point for the detected MPs. High concentrations of diclofenac, tramadol and carbamazepine were determined, the latter with medium to high risk for algae. Some pharmaceuticals and perfluorooctanesulfonic acid (PFOS) were broadly distributed, maybe due to the direct discharge into the sea. Atrazine and alachlor were found in the majority of the samples, with alachlor levels often considered as medium to high risk. Unlabelled Image • 38 micropollutants were investigated along the Portuguese coast. • Atrazine was the most frequently detected compound in both estuarine and sea water. • Pharmaceuticals were found more often near highly urbanized areas. • PFOS, EHMC and pesticides were largely spread. • Only norfluoxetine, imidacloprid and methiocarb were never detected. [ABSTRACT FROM AUTHOR]