Unmixing the water and sediments from the Amazon River - Sawakuchi, André Oliveira; Chiessi, Cristiano Mazur; Zabel, Matthias; Schefuß, Enno; Nogueira, Luciana; Mineli, Thays Desiree; Grohmann, Carlos Henrique; Sawakuchi, Henrique Oliveira (South American Symposium on Isotope Geology, 2014)