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“To predict the future of coastal areas is necesary to know how was it in past”. One century sedimentary record of Hg and Pb pollution in the Sagua estuary (Cuba) derived from 210 Pb and 137 Cs chronology.

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One century sedimentary record of know how was it in past”Hg and Pb pollution in the Sagua estuary (Cuba) derived from 210Pb and 137Cs chronology

Díaz-Asencio M. Alonso-Hernández C.M., Bolanos-Álvarez Y., Gómez-Batista M. , Morabito R., Hernández-Albernas J.I., Eriksson M., Sanchez-Cabeza J.A.

Centro de Estudio Ambientales de Cienfuegos, Cienfuegos, Cuba.

ENEA-C.R.E. Casaccia, PROT-CHIM, Roma, Italy.

Centro de Investigaciones y Servicios Ambientales, Villa Clara, Cuba.

IAEA Marine Environment Laboratories, Monaco.


Pollution sources
Pollution sources know how was it in past”

Hg Pb

Urbanwaste

Dum

1972

Hg

Alacranes Dam

Chlor-alkali plant


Chlor-alkali plant know how was it in past”

1979

Hg

Mercury cell


Sagua la grande city
Sagua la grande city know how was it in past”


Sampling know how was it in past”

Bahía de Santa Clara (15 m)


High-resolution gamma spectrometry know how was it in past”

Grain size

Mercury analysis

X-Ray Fluorescence (XRF)

SPECTOR X-LAB PRO

2000 system


210 know how was it in past”Pb

Accumulation rate:

0.17 ± 0.04 g cm-2y -1

(0.52 ± 0.13 cm y-1)

137Cs

Accumulation rate

0.18 ± 0.07 g cm-2 y-1

(0.52 ± 0.09 cm y-1)


Hg and pb profiles
Hg and Pb profiles know how was it in past”


Pb pollution

Pb ( know how was it in past”µg.g-1)

This period coincides with a strong economic contraction in Cuba

Pb pollution

Based onEnrichment Factor (EF):

EF=(Ms/Als)/(Mb/Alb)

where M and Al represent the trace metal and aluminium concentrations, respectively; and, the subscripts s and b refer to sample and background values.


1988 know how was it in past”

The sediment quality

of Sagua la Grande estuary

suggests the presence of a

significant contamination

Total Hg (µg g-1)

Hg (ppm)


Conclusions
Conclusions know how was it in past”

  • The observed sedimentation rate was 0.171 ± 0.04 g cm-2 year-1, corresponding to a sediment accumulation rate of 0.52 ± 0.13 cm year-1. The 137Cs profile corroborated these estimates.

  • The Hg (concentrations up to 2.7 µg g-1) and Pb (concentrations up to 22 µg g-1) depth profiles showed important anthropogenic inputs to the coastal environment. The incomplete treatment of the residual from the chlor-alkali plant and the increment of Sagua la Grande city population are the main human activities that determine the time evolution of Hg and Pb in these sediments.

  • The observed Pb fluxes to sediments may reflect the overall development of Cuba. While industrial and economical expansion was continuous in the 1920-1980 period, a certain economical contraction was observed in the 90s, in good agreement with the collapse of the soviet economy and the commercial embargo to the country.

  • The present study showed high mercury contamination in sediments of Sagua la Grande estuary. Further studies on the uptake and distribution of Hg in edible organisms will be necessary for evaluating the risk for the local populations.


Thanks
Thanks know how was it in past”


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