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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Acknowledgments
We thank the Laboratório Nacional de Metrologia das Radiações Ionizantes (LNMRI) from the Radiation Protection and Dosimetry Institute (IRD) for the supply of the radionuclides used in the present study.
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Machado, E.C., Machado, W., Bellido, A.V.B. et al. Cesium, manganese and cobalt water–sediment transfer kinetics and diffusion into mangrove sediments inferred by radiotracer experiments. J Radioanal Nucl Chem 292, 349–353 (2012). https://doi.org/10.1007/s10967-011-1449-4
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DOI: https://doi.org/10.1007/s10967-011-1449-4