Trace metals in sediments of two estuarine lagoons from Puerto Rico

Acevedo-Figueroa, D.; Jiménez, Braulio D.; Rodríguez-Sierra, Carlos J.

doi:10.1016/j.envpol.2005.08.037

Cited by 181 publications

(85 citation statements)

References 22 publications

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“…1 (Nyékonakpoè) values suggest that the trace element may be entirely from crustal materials or natural weathering processes, while high EF values would indicate that a significant portion of trace element originates from non-crustal materials or non-natural weathering processes (Feng et al 2004). Here, the EF values were interpreted such as EF \ 1 indicates no enrichment, EF = 1-3 minor enrichment, 3-5 moderate, 5-10 moderately severe, 10-25 severe, 25-50 very severe, and [50 extremely severe (Acevedo-Figueroa et al 2006). …”

Section: Enrichment Factor (Ef) and Geoaccumulation Indexmentioning

confidence: 99%

Increased Bioavailability of Mercury in the Lagoons of Lomé, Togo: The Possible Role of Dredging

Gnandi

Han

Rezaie-Boroon

et al. 2010

AMBIO

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Surface sediments of the lagoons of Lomé, Togo, were analyzed for mercury, methylmercury, and trace elements. Concentrations were greater than typical for natural lagoon sediments, and with greater variability within the Eastern lagoon compared to the Western one. The Eastern lagoon is larger and has been dredged in the past, while the Western lagoon, which also receives major waste inputs, has not been dredged and shows less tidal flushing. Accordingly, one naturally believes that the Eastern lagoon is cleaner and probably safe to use due to its natural resources, including fishes to eat. Unexpectedly, we describe here that mercury methylation was greater in the Eastern lagoon, indicating increased bioavailability of mercury, as probably facilitated by past dredging that decreased solidphase retention of inorganic mercury. Urbanization has historically been more developed in the southern part of the lagoons, which is still reflected in contamination levels of sediment despite dredging, probably because sources of contamination are still more important there today. Such urban contamination emphasizes the need to regulate waste discharges and possible airborne contamination in growing cities of developing countries, and implements environmental and public health monitoring, especially in relation to misbelieves systematically associated with the cleansing effect of dredging activity.

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Section: Enrichment Factor (Ef) and Geoaccumulation Indexmentioning

confidence: 99%

Increased Bioavailability of Mercury in the Lagoons of Lomé, Togo: The Possible Role of Dredging

Gnandi

Han

Rezaie-Boroon

et al. 2010

AMBIO

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“…There is no predefined rule for the choice of the referring element if it has not to be locally and mainly representative of terrigenous sources [18]. [19] and [20] (tables 4 and 5). Beginning of the enrichment FE > 10 Source Anthropical A second criterion to evaluate the intensity of the metal pollution is the index of geo-accumulation (Müller, 1969).…”

Section: Laboratory Workmentioning

confidence: 99%

Assessment of heavy metals contamination in sediments at the lake of Ahémé in southern of Benin (West Africa)

Hounkpè¹,

Kèlomé²,

Adechina³

et al. 2017

JMES

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“…In the downstream WLFZ, higher EF values for As, Cd, Pb and Zn were found at X8 and X10; these higher values could be attributed to the chemical fertilizer application in the adjacent farmlands (Srinivasa Gowd et al 2010, Zhao 1996. As for Cr, Cu and Ni, the EF values were relatively lower, ranging from 1.1 to 1.6, both in the upstream and downstream WLFZs; therefore, these metals might come from crustal materials or natural weathering (Acevedo-Figueroa et al 2006). …”

Section: Enrichment Degree Assessmentmentioning

confidence: 99%

Assessing the heavy metal contamination of soils in the water-level fluctuation zone upstream and downstream of the Manwan Dam, Lancang River

et al. 2014

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Purpose The intersections of the terrestrial and aquatic systems (water-level fluctuation zones, WLFZs) suffer from the increasing pressure of hydroelectric construction and operation. Taking WLFZs upstream and downstream of Manwan Dam (first dam completed in Lancang River) as an example, the dam operation impacts on the heavy metals in soils in WLFZs were assessed. Materials and methods In December 2011, 117 soil samples were collected in the WLFZs and infralittoral reference zones (IRZs) with respect to heavy metal (Cd, Cr, Cu, Ni, Pb and Zn) and metalloid (As) concentrations. Their concentrations were determined with the application of inductively coupled plasma atomic absorption spectrometry, ICP-AES. Enrichment factor (EF), ecological risk index (RI) and principal component analysis (PCA) were employed for element contamination and ecological risk assessment and source identification, respectively. The multivariable statistic approaches, an analysis of variance (ANOVA) and a paired-samples T test were performed in the data analysis.Results and discussion Parts of element concentrations in the upstream were significantly higher than those in the downstream and significant differences existed between the WLFZs and IRZs. No significant difference was detected between the different water elevations in the WLFZs. Compared to the soil quality guidelines, As and Cd exceeded the standard in both the WLFZs and IRZs. In addition, the water-level fluctuation during the submergence increased the enrichment degree and risk level in the WLFZs. The sources of the studied elements could be divided into natural factors and anthropogenic inputs. In addition, the submergence changed the major contaminants in the upstream WLFZs. Conclusions The results verified that dam operation had an effect on the heavy metals in the soils in WLFZs. In addition, this study proposed a useful tool (modified enrichment factor) to assess the enrichment degree caused by the water-level fluctuation. Assessing the heavy metal contamination of soils in WLFZs could be an important first step to the rational management of the dam operation.

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Trace metals in sediments of two estuarine lagoons from Puerto Rico

Cited by 181 publications

References 22 publications

Increased Bioavailability of Mercury in the Lagoons of Lomé, Togo: The Possible Role of Dredging

Increased Bioavailability of Mercury in the Lagoons of Lomé, Togo: The Possible Role of Dredging

Assessment of heavy metals contamination in sediments at the lake of Ahémé in southern of Benin (West Africa)

Assessing the heavy metal contamination of soils in the water-level fluctuation zone upstream and downstream of the Manwan Dam, Lancang River

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