gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.3.172 Seasonal Variations of Trace Elements and Organic Carbon in Dissolved and Particulate Phases of Tropical River Waters (Nyong Basin, Cameroon) Viers J. Dupré B. Deberdt S. Laboratoire de Géochimie, CNRS-UMR 5563, Université Paul Sabatier, 38 rue des 36 Ponts, 31400 Toulouse, France Hamelin B. CEREGE, CNRS URA 132, Aix-En-Provence, France Braun J. J. ORSTOM BP 1857, Yaoundé, Cameroun Ngoupayou J. N. IRGM-CRH BP 4110, Yaoundr, Cameroun 1998 62A 3 1599 1600 Copyright © 1998, The Mineralogical Society 1998