Maurice Bourgoin Laurence auteur aut IRD Quiroga I. auteur aut IRD Malm O. auteur aut IRD Courau P. auteur aut IRD text conferencePaper eng text/pdf reformatted digital access Total mercury concentration range measured in surface waters of the Bolivian Amazon basin vary from 2.24-2.57 ng 1-1 in glacial waters to 7.228.22 ng 1-1, in the Beni River at the end of the Andean piedmont. The highest mercury concentration were not found in the rivers where the mining activities take place but at the outlet of the Andean sub-basins exploited for their alluvial gold. The quite low concentrations of Hg in the sediments indicate a low sedimentary contamination due to the high particulate transport in the Andena tributaries. In piscivorous fishes, the mercury concentrations found vary in the Beni and Mamore rivers from 0.8-2.3 ug Hg g-1 and 0.4-2-1 ug Hg g-1 respectively, to 0.3-5.2 ug Hg g-1 in the Madeira River at its formatin. We found that 70% of the piscivorous fishes collected was highty contaminated. The major health impact caused by mercury affects people who are not working directly in gold cooperatives but who have a regular fish diet. (Résumé d'auteur) specialized MERCURE CONTAMINATION POLLUTION DES EAUX CONTINENTALES COURS D'EAU POISSON D'EAU DOUCE EXPLOITATION DU SOUS SOL OR ALIMENTATION HUMAINE SANTE PUBLIQUE BOLIVIE 038POLCON Manaus'99 - Hydrological Geochemical Processes in Large Scale River Basins, Manaus (BRA), 1999/11/16-19 7 multigr. Guyot Jean-Loup ed. edt IRD s.l. s.n. 1999 https://www.documentation.ird.fr/hor/fdi:010025638 [F B010025638] https://www.documentation.ird.fr/hor/fdi:010025638 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_7/b_fdi_57-58/010025638.pdf IRD - Base Horizon / Pleins textes 2001-07-31 2021-05-20 fdi:010025638 fre