“To predict the future of coastal areas is necesary to know how was it in past”
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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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To predict the future of coastal areas is necesary to know how was it in past

“To predict the future of coastal areas is necesary to know how was it in past”


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 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

Hg Pb

Urbanwaste

Dum

1972

Hg

Alacranes Dam

Chlor-alkali plant


To predict the future of coastal areas is necesary to know how was it in past

Chlor-alkali plant

1979

Hg

Mercury cell


Sagua la grande city

Sagua la grande city


To predict the future of coastal areas is necesary to know how was it in past

Sampling

Bahía de Santa Clara (15 m)


To predict the future of coastal areas is necesary to know how was it in past

High-resolution gamma spectrometry

Grain size

Mercury analysis

X-Ray Fluorescence (XRF)

SPECTOR X-LAB PRO

2000 system


To predict the future of coastal areas is necesary to know how was it in past

210Pb

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


Pb pollution

Pb (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.


To predict the future of coastal areas is necesary to know how was it in past

1988

The sediment quality

of Sagua la Grande estuary

suggests the presence of a

significant contamination

Total Hg (µg g-1)

Hg (ppm)


Conclusions

Conclusions

  • 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


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