HR: 1400h
AN: GS23B-07 [Abstracts]
TI: Leached Metals in Surface Sediments in the Southern Gulf of Mexico
AU: * Vazquez, F
EM: felipe@icmyl.unam.mx
AF: Universidad Nacional Autonoma de Mexico. Instituto de Ciencias del Mar y Limnologia,
Ciudad Universitaria, Coyoacan, Mexico, DF 04510, Mexico
AU: Herrera, M
EM: felipe@icmyl.unam.mx
AF: PEMEX-Exploracion-Produccion. Gerencia de Seguridad Industrial, Proteccion Ambiental y
Calidad, Region Marina Noreste, Edificio Cantarell Corporativo, Calle 25, Cd. del Carmen, Cam , Mexico
AU: Perez-Cruz, L
EM: perezcruz@geofisica.unam.mx
AF: Universidad Nacional Autonoma de Mexico. Instituto de Geofisica, Ciudad Universitaria,
Coyoacan, Mexico, DF 04510, Mexico
AU: Alexander, H
EM: alexander-valdes@icmyl.unam.mx
AF: Universidad Nacional Autonoma de Mexico. Instituto de Ciencias del Mar y Limnologia,
Ciudad Universitaria, Coyoacan, Mexico, DF 04510, Mexico
AU: Diaz, A
EM: felipe@icmyl.unam.mx
AF: Universidad Nacional Autonoma de Mexico. Instituto de Ciencias del Mar y Limnologia,
Ciudad Universitaria, Coyoacan, Mexico, DF 04510, Mexico
AB:
Surface sediment samples have been collected a board of R/V "Justo Sierra" in the Gulf of Mexico from 1996 to
2005. Leached metals Ba, Cd, Cu, Ni, and V were analyzed in order to establish their distribution at three levels
of surface sediments (0-1, 4-5, 8-10 cm depth), and to document their spatial distribution in the study area.
Statistical treatments, linear and Spearman correlation and principal components analysis were applied to the
data. Results show that the barium average concentration was 667 ėg/kg during 1998. During subsequent years,
this average value decreased, but in 2005 the value increased four times respect to 1998 levels (>2,800
μg/kg). Cadmium average concentrations were relatively high between 1998 and 2001, afterwards low
concentrations were observed (<45 ėg/kg). Leached copper average concentrations decreased consistently
through the years. But an increase in the two first sedimentary levels ranged between 4.4 -15,540 μg/kg was
observed in 2005. Leached nickel had fairly low concentrations between 1998 to 2004, but an increase in the
three levels were observed in 2005, and later on, its average concentration reached 186 μg/kg, similar to
2005 values. Leached vanadium concentrations were variable through the years, with high values observed in
2006 (235 μg/kg). Metal concentration values mapped with respect to sampling sites permit to investigate on
the spatial and temporal distributions, establishing a micro-zonification in the study area.
DE: 1050 Marine geochemistry (4835, 4845, 4850)
DE: 1065 Major and trace element geochemistry
DE: 4835 Marine inorganic chemistry (1050)
SC: Geochemical Society [GS]
MN: 2007 Joint Assembly