1. Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, D-95447 Bayreuth, Germany
2. Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavík, Iceland
3. Sweco Environment AB, Västra Varvsgatan 11, 972 36 Luleå, Sweden