1. Facultad de Ciencias Ambientales, Universidad Tecnológica de Pereira, Apartado Aereo 97. Sede la Julita, Pereira, Colombia (E-mail: diparede@utp.edu.co)
2. UFZ Centre for Environmental Research Leipzig-Halle, Permoserstrasse15, D-04318 , Leipzig, Germany (E-mail: peter.kuschk@ufz.de)
3. Institute for Environmental Engineering. Martin-Luther-University Halle-Wittenberg, Geusaerstrasse/Geb. 135, D-06217, Merseburg, Germany