1. a Spanish National Reference Centre for Persistent Organic Pollutants , University of Alcalá , Alcalá de Henares, Madrid, Spain
2. b Department of Chemical Engineering and Analytical Chemistry , University of Alcalá , Alcalá de Henares, Madrid, Spain
3. c Department of Organic Chemistry , University of Alcalá , Alcalá de Henares, Madrid, Spain
4. d Department of Hydrogeology and Analytical Chemistry , University of Almería , Almería, Spain
5. e IMDEA Water Foundation , Alcalá de Henares , Madrid, Spain