%0 Conference Proceedings
%9 ACTI : Communications avec actes dans un congrès international
%A Maurice Bourgoin, Laurence
%A Quiroga, I.
%A Malm, O.
%A Courau, P.
%T Total mercury distribution in the Bolivian tributaries of the Madeira river : importance of the biomagnification process in the aquatic food-chain
%S Manaus'99 : hydrological and geochemical processes in large scale river
%C s.l.
%D 1999
%E Guyot, Jean-Loup
%L fdi:010025638
%G ENG
%I s.n.
%K MERCURE ; CONTAMINATION ; POLLUTION DES EAUX CONTINENTALES ; COURS D'EAU ; POISSON D'EAU DOUCE ; EXPLOITATION DU SOUS SOL ; OR ; ALIMENTATION HUMAINE ; SANTE PUBLIQUE
%K BOLIVIE
%K MADEIRA FLEUVE
%P 7  multigr.
%U 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
%W Horizon (IRD)
%X 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)
%B Manaus'99 - Hydrological Geochemical Processes in Large Scale River Basins
%8 1999/11/16-19
%$ 038POLCON