Authors:
E. Machado Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro, Nilópolis, RJ 26530-060, Brazil

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W. Machado Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-007, Brazil

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A. Bellido Departamento de Físico-Química, Universidade Federal Fluminense, Niterói, RJ 24020-007, Brazil

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L. Bellido Instituto de Engenharia Nuclear/CNEN, Rio de Janeiro, RJ 21945-970, Brazil

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S. Patchineelam Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-007, Brazil

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Abstract  

A study on the trace elements transfer from tidal water to mangrove sediments from Guanabara Bay (southeastern Brazil) was performed in laboratory microcosms. Sediment cores were covered with tidal water spiked with 137Cs, 54Mn and 57Co during 5-h experiments, and water samples were taken at regular intervals to measure uptake kinetics at the sediment–water interface. At the end of the experiments, the uptake and diffusional penetration into the sediments was evaluated. Half-removal times from water to sediments were slightly higher for 137Cs (3.4 ± 1.7 h) than observed for 54Mn (2.3 ± 0.2 h) and 57Co (2.6 ± 1.1 h). After these experiments, all radioisotopes presented decreasing activities with increasing sediment depth, being the distribution of 137Cs indicative of higher diffusion within the upper 2 cm. This study on the removal of 137Cs, 54Mn and 57Co from tidal water by mangrove sediments suggests that while 57Co and 54Mn presented closer behaviors, there was a slightly higher mobility of 137Cs.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)