Sediments as a source for contaminants?

Salomons, Wim; Rooij, N. M. de; Kerdijk, H.; Bril, J.

doi:10.1007/bf00048643

Cited by 221 publications

(83 citation statements)

References 36 publications

(25 reference statements)

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“…Owing to increasing water quality, the oxygen availability in sediments is increasing, and in a cascade effect, this could cause remobilization of metals associated with, for example, sulfides (Salomons et al, 1987). Controlling the potential of the sediment may aid in a more gradual oxidation of sulfide species and, therefore, slower metal release.…”

Section: Reductive Processesmentioning

confidence: 99%

Microbial ecology meets electrochemistry: electricity-driven and driving communities

et al. 2007

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Bio-electrochemical systems (BESs) have recently emerged as an exciting technology. In a BES, bacteria interact with electrodes using electrons, which are either removed or supplied through an electrical circuit. The most-described type of BES is microbial fuel cells (MFCs), in which useful power is generated from electron donors as, for example, present in wastewater. This form of charge transport, known as extracellular electron transfer, was previously extensively described with respect to metals such as iron and manganese. The importance of these interactions in global biogeochemical cycles is essentially undisputed. A wide variety of bacteria can participate in extracellular electron transfer, and this phenomenon is far more widespread than previously thought. The use of BESs in diverse research projects is helping elucidate the mechanism by which bacteria shuttle electrons externally. New forms of interactions between bacteria have been discovered demonstrating how multiple populations within microbial communities can co-operate to achieve energy generation. New environmental processes that were difficult to observe or study previously can now be simulated and improved via BESs. Whereas pure culture studies make up the majority of the studies performed thus far, even greater contributions of BESs are expected to occur in natural environments and with mixed microbial communities. Owing to their versatility, unmatched level of control and capacity to sustain novel processes, BESs might well serve as the foundation of a new environmental biotechnology. While highlighting some of the major breakthroughs and addressing only recently obtained data, this review points out that despite rapid progress, many questions remain unanswered.

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Section: Reductive Processesmentioning

confidence: 99%

Microbial ecology meets electrochemistry: electricity-driven and driving communities

et al. 2007

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“…During this process, adsorption to suspended particulate matter as well as precipitation processes rapidly transfer both contaminants and nutrients from surface waters to bottom sediments, leading to their accumulation. Although most adsorbed pollutants are not readily available for aquatic organisms, sediments may become an important pollution source, depending on environmental conditions (temperature, pH, redox, and the content of organic chelates, among others) (Salomons et al 1987). Therefore, displacement of sediments (e.g., dredging, deposition, and decontamination) is a major source of concern for aquatic ecosystems because it may cause mobilization and resuspension of contaminants with potential consequences on aquatic biota and water quality.…”

Section: Introductionmentioning

confidence: 99%

The potential of the Phytotoxkit microbiotest for hazard evaluation of sediments in eutrophic freshwater ecosystems

Czerniawska-Kusza

Kusza

2010

Environ Monit Assess

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The applicability of the Phytotoxkit microbiotest for toxicity assessment of sediments in eutrophic freshwater ecosystems was evaluated. Sediments were collected from Turawa dam reservoir (southwestern Poland) which, for years, has been subjected to a marked nutrient enrichment and heavy metal contamination. The test plant species were exposed to whole sediments, solid phases of sediments, and pore waters. Phytotoxicity was estimated on the basis of seed germination and root elongation measurements, combined into an overall germination index (GI). For pore waters, the majority of GI values were not statistically different from the controls, which was consistent with chemical data. For solid phases and whole sediments, GI values showed diversified effects ranging from growth stimulation to growth inhibition. The results obtained vary depending on the plant species and the type of sediment samples. Generally, tests with solid phases of sediments showed phytostimulation, suggesting that higher amount of nutrients adsorbed on organic matterrich sediments might conceal the inhibitory impact of heavy metals (Cd, Cr, Cu, Mn, Ni, Pb, and I. Czerniawska-Kusza (B) · G. Kusza

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“…In particular, the high trapping and settling processes characteristic of lagoons lead to high concentrations of contaminants to accumulate in sediments over time. Surface sediment then in turn appears as a contamination source, especially when physico-chemical conditions of the environment are such that contaminants associated with the sediment are able to flux into the overlying or pore-water, and incorporate into the benthic and pelagic biota (Salomons et al 1987).…”

Section: Introductionmentioning

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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Sediments as a source for contaminants?

Cited by 221 publications

References 36 publications

Microbial ecology meets electrochemistry: electricity-driven and driving communities

Microbial ecology meets electrochemistry: electricity-driven and driving communities

The potential of the Phytotoxkit microbiotest for hazard evaluation of sediments in eutrophic freshwater ecosystems

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

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