Toxic metal(loids) levels in the aquatic environment and nuclear alterations in fish in a tropical river impacted by gold mining

Córdoba-Tovar, Leonomir; Marrugo‐Negrete, José; Barón, Pablo Andrés Ramos; Calao-Ramos, Clelia; Dı́ez, Sergi

doi:10.1016/j.envres.2023.115517

Cited by 4 publications

(3 citation statements)

References 58 publications

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“…Only five microorganisms did not exhibit colony development in any tolerance trials. It has been reported that gold mining occurs upstream of the Atrato, San Juan, and Baudó rivers, with wastewater influence downstream [22,31,32]. Therefore, it is possible that the presence of inorganic pollutants, such as heavy metals, in the collected sediments may have alter microbial metabolism and community structures [69], thus fostering the development of heavy metal-resistant strains in the selected sampling points.…”

Section: Discussionmentioning

confidence: 99%

“…Three sampling zones (eight total sampling sites) in the Chocó region of Colombia were selected for collecting sediment samples (Figure 1). These sites experience anthropogenic influence due to the discharge of untreated wastewater and alluvial gold mining [30][31][32]. Three sampling sites were located in estuarine areas in the southern Atlantic portion of the Colombian Caribbean Sea, i.e., in the Atrato River mouth (Gulf of Urabá) (Figure 1, left).…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

See 1 more Smart Citation

Heavy Metal Tolerance of Microorganisms Isolated from Coastal Marine Sediments and Their Lead Removal Potential

Alvarado-Campo,

Quintero,

Cuadrado-Cano

et al. 2023

Microorganisms

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In this study, 338 microorganisms, comprising 271 bacteria and 67 fungi, were isolated from sediment samples collected from underexplored Pacific and Caribbean regions of Colombia. Screening trials were conducted on selected strains (n = 276) to assess their tolerance to cadmium (Cd2+), lead (Pb2+), and zinc (Zn2+), leading to the identification of six bacteria capable of withstanding 750 mg·L−1 of each heavy metal ion. Three promising microorganisms, identified as Enterobacter sp. INV PRT213, Pseudomonas sp. INV PRT215, and Stenotrophomonas sp. INV PRT216 were selected for lead removal experiments using LB broth medium supplemented with 400 mg·L−1 Pb2+. Among these, Pseudomonas sp. INV PRT215 exhibited significant potential, removing 49% of initial Pb2+ after 240 min of exposure (16.7 g wet biomass·L−1, pH 5, 30 °C). Infrared spectra of Pb-exposed biomass showed changes in functional groups, including carbonyl groups of amides, carboxylate, phosphate, hydroxyl, and amine groups, compared to the not-exposed control. These changes suggested interactions between the metal and functional groups in the biomass. The findings of this study highlight the potential of microorganisms derived from coastal marine environments as promising candidates for future applications in bioremediation of polluted environments contaminated with heavy metals.

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Section: Discussionmentioning

confidence: 99%

Section: Study Area and Sample Collectionmentioning

confidence: 99%

Heavy Metal Tolerance of Microorganisms Isolated from Coastal Marine Sediments and Their Lead Removal Potential

Alvarado-Campo,

Quintero,

Cuadrado-Cano

et al. 2023

Microorganisms

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“…However, the pH values were relatively homogeneous between the sampling sites (6 to 7.4; CV = 7.4%). Increasing pH alters the number of ligands available in the aqueous medium through the adsorption of cations and the desorption of anions [59]; hence, greater pH values facilitate mercury adsorption on suspended particulate matter [60]. Therefore, the transport of Hg bound to particulate matter into the lakes and the pH of the water close to neutral might favor the immobilization of Hg in the water column in the lakes upstream of our study area.…”

Section: Influence Of Land Use and Ph On Thg Concentrations In Watermentioning

confidence: 95%

Mercury Bioconcentration and Translocation in Rooted Macrophytes (Paspalum repens Berg.) from Floodplain Lakes in the Araguaia River Watershed, Brazilian Savanna

Monteiro,

Vieira,

Bernardi

et al. 2024

Water

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Macrophytes are fundamental photosynthetic organisms for functioning freshwater ecosystems, identified as potential bioindicators of mercury (Hg) in the environment. We quantified the concentrations of total Hg (THg) in water and macrophytes (Paspalum repens Berg.) from 17 lakes on the Araguaia River floodplain, aiming to compare the bioconcentration factor (BCF) in the aerial tissues and roots; evaluate the translocation factor (TF) between plant tissues; and assess the influence of environmental factors and land use on THg concentrations in water and macrophytes. The BCF was significantly higher in roots (1.29 ± 0.32) than in aerial tissues (0.41 ± 0.34), with low TF between plant tissues (0.14 ± 0.06). The highest concentrations of THg in water were determined in lakes with higher land use intensity and a pH close to neutral, indicating the transport of particulate-bound Hg and the immobilization in the water column. In contrast, wetlands were priority areas for the bioconcentration of THg in macrophytes, associated with sulfate, dissolved oxygen, and oxidation–reduction potential in the water. Thus, although P. repens is not a suitable bioindicator of Hg mobilization by anthropogenic land use in our study area, our results suggest the potential of macrophytes as bioindicators of sites that are favorable to Hg methylation.

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Effects of blood metal(loid) concentrations on genomic damages in sharks

Botêlho de Araújo,

Alves de Mendonça,

de Lima Viana

et al. 2024

Environmental Pollution

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Toxic metal(loids) levels in the aquatic environment and nuclear alterations in fish in a tropical river impacted by gold mining

Cited by 4 publications

References 58 publications

Heavy Metal Tolerance of Microorganisms Isolated from Coastal Marine Sediments and Their Lead Removal Potential

Heavy Metal Tolerance of Microorganisms Isolated from Coastal Marine Sediments and Their Lead Removal Potential

Mercury Bioconcentration and Translocation in Rooted Macrophytes (Paspalum repens Berg.) from Floodplain Lakes in the Araguaia River Watershed, Brazilian Savanna

Effects of blood metal(loid) concentrations on genomic damages in sharks

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