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- Title
Removal of Zinc from Tidal Water by Sediments of a Mangrove Ecosystem: A Radiotracer Study.
- Authors
Machado, E. C.; Machado, W.; Bellido, L. F.; Patchineelam, S. R.; Bellido, A. V. B.
- Abstract
The removal of 65Zn from tidal water by underlaying sediment cores collected in a mangrove forest and a tidal creek that drains this forest in Sepetiba Bay (SE Brazil) was investigated. After 30-h experiments in laboratory microcosms, the 65Zn half-removal times from tidal creek and mangrove forest sediments were 8.7 ± 1.8 and 9.2 ± 0.9 h respectively. Depth penetration of 65Zn was mainly restricted to the upper 3 cm in mangrove forest cores, while detectable 65Zn activities were found in all layers (0–7 cm depth) of tidal creek cores. An unexpected 65Zn release back to the overlaying water was observed for one of the tidal creek experiments in the 12–18 h interval (corresponding to a return of 17% of the initial 65Zn activity in overlaying water), suggesting a reversibility of the 65Zn removal process (e.g., by adsorption) in tidal creek sediments. The results indicate that mangrove-vegetated sediments allowed a lower vertical mobility of Zn than observed in creek sediments and mangrove sediments appear to be less susceptible to a reversion in the process of zinc removal from overlaying water, suggesting a greater capacity to retain this metal near the water–sediment interface. This first radiotracer approach on the mangrove sediments removal of Zn from tidal waters supports earlier experimental studies employing stable Zn, contributing for a better understanding of the metal uptake kinetics by such sediments and suggesting that these sediments act as active sinks for trace metals.
- Subjects
BRAZIL; CHEMISTRY experiments; SEPARATION (Technology); SCIENTIFIC experimentation; ZINC; SEDIMENTS; MANGROVE forests; SEDIMENTATION &; deposition; TIDE-waters
- Publication
Water, Air & Soil Pollution, 2008, Vol 192, Issue 1-4, p77
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-008-9636-9