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Removal of Zn and Cd from Overlying Water by Mangrove Sediments: Testing the Effects of Sediment Resuspension/Redeposition Events

Authors
  • Suzuki, K. N.1, 2
  • Castro, R. J. M.1
  • Sondermann, M. N.1, 3
  • Machado, E. C.4
  • Bellido, A. B.1
  • Lopes, R. T.2
  • Machado, W.1
  • 1 Universidade Federal Fluminense, Niterói, RJ, 24020-007, Brazil , Niterói (Brazil)
  • 2 Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21945-970, Brazil , Rio de Janeiro (Brazil)
  • 3 Universidade de Lisboa, Lisbon, 1600-189, Portugal , Lisbon (Portugal)
  • 4 Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro, Nilópolis, RJ, 26530-060, Brazil , Nilópolis (Brazil)
Type
Published Article
Journal
Water Air & Soil Pollution
Publisher
Springer-Verlag
Publication Date
Jan 20, 2020
Volume
231
Issue
2
Identifiers
DOI: 10.1007/s11270-020-4417-1
Source
Springer Nature
Keywords
License
Yellow

Abstract

Coastal sediment redeposition after resuspension events may change the sediment capacity to sequester pollutants after the formation of new sediment-water interfaces. To test this hypothesis, radiotracer experiments were performed to evaluate zinc (65Zn) and cadmium (109Cd) removal kinetics by redeposited mangrove sediments. After 24-h experiments, average inventories within redeposited sediments were close to those from control sediments (~ 20% lower in redeposited sediments), while average decreases of 41% (109Cd) and 27% (65Zn) in the half-removal times (t1/2) from overlying water were promoted by redeposited sediments in comparison with control sediments. High variability in metal removal rates, however, implied in no statistically significant differences between t1/2 values, suggesting a low influence of sediment redeposition on the metal removal capacity of mangrove sediments. More limited depth diffusion of metals was observed within redeposited sediments, always within the uppermost centimeter. Possible benefits to water quality by a slightly faster metal diffusion into redeposited sediments may be less effective due to this trend since the metal retention very close to the sediment top can facilitate new remobilization to the overlying water.

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