1 Federal Environment Agency, Wörlitzer Platz 1, D-06844 Dessau-Roßlau, Germany.
2 TZW: DVGW-Technologiezentrum Wasser (German Water Centre), Karlsruher Str. 84, 76139 Karlsruhe, Germany.
3 Environmental Institute, Okružná 784/42, 97241 Koš, Slovak Republic; Laboratory of Analytical Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece.
4 Environmental Institute, Okružná 784/42, 97241 Koš, Slovak Republic.
5 Laboratory of Analytical Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, 15771 Athens, Greece.
6 Slovak University of Technology, Faculty of Chemical and Food Technology, Institute of Information Engineering, Automation and Mathematics, Radlinskeho 9, 81237 Bratislava, Slovak Republic.
7 TZW: DVGW-Technologiezentrum Wasser (German Water Centre), Karlsruher Str. 84, 76139 Karlsruhe, Germany. Electronic address: marco.scheurer@tzw.de.