1 23 Environmental Science and Pollution Research ISSN 0944-1344 Environ Sci Pollut Res DOI 10.1007/s11356-016-8225-5 Exploring river pollution based on sediment analysis in the Upper Tisza region (Hungary) Zsuzsanna Balogh, Sándor Harangi, István Gyulai, Mihály Braun, Katalin Hubay, Béla Tóthmérész & Edina Simon