Biological Approaches for Remediation of Metal-Contaminated Sites

Pinto, Ana Paula; Varennes, Amarílis de; Lopes, M. E.; Teixeira, Dora Martins

doi:10.1007/978-3-319-40148-5_3

Cited by 9 publications

(2 citation statements)

References 351 publications

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“…This can be corroborated since, there is no significant difference (p > 0.05) in the content of metals in sediments and in the Water hyacinth plants for Co, Zn, Ni, Cu, Pb, Cr, Ba, Mo and V. Moreover, mean metal content in Water hyacinth plants is significantly higher than in sediments for As (p < 0.05) (Figure 4). This could imply, as reported by some authors [54,55] that as with Hg and Selenium (Se) [65], Arsenic (As) in the Water hyacinth plants is undergoing a process of phytovolatilization before it dies.…”

Section: Potential Toxic Metal In Sedimentsmentioning

confidence: 86%

“…Moreover, the presence of Water hyacinth plants in this zone might promote the sedimentation process driven mainly by the change of the hydraulic regimen. In addition, the plant's rhizosphere stimulates the growth of the aerobic biofilm which may play an important role in adsorbing PTMs from water [54]. Furthermore, the plants can secrete exudates that contain carbohydrates, amino acids, polysaccharides and flavonoids [55,56], which in turn can act as exogenous chelating agents and thus precipitate PTMs.…”

Section: Physicochemical Parameters and Potential Toxic Metal (Ptms) mentioning

confidence: 99%

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Assessment of Potential Toxic Metals in a Ramsar Wetland, Central Mexico and its Self-Depuration through Eichhornia crassipes

Tabla-Hernandez

Rodríguez-Espinosa

Mendoza-Pérez

et al. 2019

Water

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The Valsequillo reservoir is a Ramsar wetland due to its importance as a point of convergence of migratory waterfowl. It is located in Central Mexico and is currently endangered by the constant spill of municipal and industrial discharges from Puebla city. On this context, we evaluated thirteen potential toxic metals (PTMs) in water, Water hyacinth (E. crassipes) plants and sediments at this site. A combined number of 31 samples were collected from the study area. The degree/extent of metal contamination in sediments was assessed through different geochemical indexes, namely: Geoaccumulation index (Igeo), Enrichment Factor (EF) and Potential Ecological Risk Index (PERI). The ability of Water hyacinth plants residues as a phytodepurator in the Ramsar site was tested in terms of the bioaccumulation factor (BF) and the translocation factor (TF). The results concerning sediments showed that Pb, Cu and Hg pose a threat to the aquatic environment since Igeo and EF indicate sediments ranging from moderately contaminated to contaminated. Moreover, PERI pointed out Hg as the main contributor to the ecological risk in sediments, especially in the part of the reservoir covered by E. crassipes. Water hyacinth plants displayed good capacity to absorb PTMs from the water, since the content of Co, Zn, As, Ni, Cu, Pb, Ti, Cr, Ba, Mo and V in the total plant was (all values in mg/kg of dry weight) 21 ± 9, 408 ± 300, 12 ± 6, 93 ± 21, 93 ± 69, 53 ± 29, 1067 ± 643, 78 ± 55, 362 ± 39, 14 ± 0.6 and 96 ± 35, respectively. Metal content in sediments resembles to that of E. crassipes; especially in the roots, suggesting a constant deposition of plants at the bottom of the reservoir, which contributes to the eutrophication of the water. The present work encourages the need for a sustainable management of Water hyacinth plants in the Ramsar site, since they represent a plague and a natural phyto-depurator at the same time.

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Section: Potential Toxic Metal In Sedimentsmentioning

confidence: 86%