TY - JOUR
T1 - Historical trends of polychlorinated dibenzo-p-dioxins and dibenzofurans in three dated sediment cores from Mexico
AU - Yunuén, Canedo López
AU - Vinicio, MacÍas Zamora J.
AU - Miguel Angel, Huerta Diaz
AU - Wee Kwong, Laval Liong
AU - Sanchez-Cabeza, Joan Albert
PY - 2011/2/1
Y1 - 2011/2/1
N2 - This paper describes the first report of dioxins and furans (PCDDs/Fs) in sediment cores from Mexico. Sedimentation rates and vertical fluxes were estimated using 210Pb dating. Two cores correspond to marine sediments and one to an endorheic lake. Concentrations of PCDDs/Fs found in the three sites are typical of non-impacted areas with low concentrations when compared to reference values. However the PCDDs/Fs sediment profiles show an increasing concentration trend in the upper core sections. This behavior is different from that found at many sites around the globe where diminishing concentrations have been reported. A strong predominance of OCDD was observed, and a comparison to typical composition profiles of industrial and other sources did not result in clear origin assignments for these measured compounds. We suggest that local sources may be responsible for the increase in concentration and, because these undetermined sources have not been curtailed, their importance is still growing. © 2010 Elsevier Ltd. All rights reserved.
AB - This paper describes the first report of dioxins and furans (PCDDs/Fs) in sediment cores from Mexico. Sedimentation rates and vertical fluxes were estimated using 210Pb dating. Two cores correspond to marine sediments and one to an endorheic lake. Concentrations of PCDDs/Fs found in the three sites are typical of non-impacted areas with low concentrations when compared to reference values. However the PCDDs/Fs sediment profiles show an increasing concentration trend in the upper core sections. This behavior is different from that found at many sites around the globe where diminishing concentrations have been reported. A strong predominance of OCDD was observed, and a comparison to typical composition profiles of industrial and other sources did not result in clear origin assignments for these measured compounds. We suggest that local sources may be responsible for the increase in concentration and, because these undetermined sources have not been curtailed, their importance is still growing. © 2010 Elsevier Ltd. All rights reserved.
KW - Mexico
KW - PCDD
KW - PCDF
KW - Sediment cores
KW - Time trends
U2 - 10.1016/j.envpol.2010.10.024
DO - 10.1016/j.envpol.2010.10.024
M3 - Article
VL - 159
SP - 487
EP - 494
IS - 2
ER -