Sediment-associated contaminants ? an overview of scientific bases for developing remedial options

F�rstner, Ulrich

doi:10.1007/bf00048663

Cited by 69 publications

(10 citation statements)

References 153 publications

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“…In fact, the fraction F3 in SIII was second in descending order presented above, other than S0. Accordingly, Förstner (1987) reported the existence of a time-dependent intensity adsorption compounds and suggested that the adsorption sites high energy (less numerous) are filled first, and become limiting in few, and that all the energy of the sediment decreases as these sites are filled less energy.…”

Section: Discussionmentioning

confidence: 99%

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

et al. 2013

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AIM: Artificial sediments with simple formulations were used to assess the toxicity of Cr to C. xanthus, D. rerio and P. reticulata. METHODS: The organisms were exposed to two sediment formulations: one without organic matter (S0) and one with 1% organic matter (SIII), both contaminated with Cr at concentrations of 90, 180, 360, 720 and 1440 mg/kg for the assays with C. xanthus, and 375, 750, 1500 and 3000 mg/kg for those with the two fish species. Chromium was obtained from the potassium dichromate (K2Cr2O7). RESULTS: The results of the acute toxicity tests demonstrated a reduction of up to four times in toxicity with the presence of OM, consisting of biodegradable detritus, even at the low concentration used (1%), and that C. xanthus was most sensitive to the metal. The reduction in the chromium toxicity was indicated by the LC50 values, which were higher in SIII (1234.43 mg/kg; 2263.54 m/kg; 2244.48 mg/kg) than in S0 (340.56 mg/kg; 1731.04 mg/kg; 1733.55 mg/kg) for C. xanthus, D. rerio and P. reticulata, respectively. CONCLUSIONS: Because of the repeatability of the results obtained, the artificial sediments with simple formulations were satisfactory to assess toxicity and can thus provide reliable results in ecotoxicological studies

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Section: Discussionmentioning

confidence: 99%

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

et al. 2013

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“…In accordance with Förstner studies in 1987, the mercury solubility in the water is increased by the amount of decomposed organic matter (Förstner 1987). A great percentage of it is removed by biological processes, what consequently cause a microbial growth and a consumption of the oxygen dissolved in the liquid mass (Wren et al 1991;Jordão et al 2002).…”

Section: Resultsmentioning

confidence: 51%

“…This is due to the fact that aquatic organisms are capable to concentrate the trace elements in up to 105 times the concentration observed in the environment (Hylander et al 2000;Cooper and Gillespie 2001). It is already known that Hg concentration in an organism cannot be considered as a constant value, but as a subjected factor for the influences of the biotic variations as well as abiotic influences (Förstner 1987).…”

Section: Introductionmentioning

confidence: 99%

Mercury concentration in fish from Piracicaba River (Minas Gerais, Brazil)

Arantes¹,

Pinto²,

Mangabeira³

et al. 2008

Environ Monit Assess

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Mercury emissions from some upstream gold mining areas and recent findings of high natural Hg levels in sediments motivated studies on the Hg cycle in the Minas Gerais state. The study presents the total mercury amount found in Geophagus brasiliensis' muscular tissue (wet weight) and sediments from Piracicaba River. Mercury was analyzed using acid digestion followed by determination of total mercury by cold vapour atomic absorption spectrophotometry. This study was also complemented with the analysis of the limnological parameters (water temperature, conductivity, total dissolved solids, suspended particles, pH, dissolved oxygen, maximum depth, photic index and total carbon). The mercury concentration in sediments samples was higher than the mercury concentration in muscular tissue of fish. The lowest Hg level measured in fish was 0.0147 microg g( - 1), while the highest was 0.101 microg g( - 1). In the sediment samples, the lowest and highest levels were 0.02 microg g( - 1) and 0.16 microg g( - 1), respectively. The Hg concentrations in fish and sediment were both under the maximum limit permitted by the World Health Organization.

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“…[64][65][66] In this case, the saturation of dissolved oxygen in the SEPAPM can also influence the content of the metals associated with the SPM, which has been verified in other river systems under oxide conditions, where Cd, Zn and Ni were associated with Mn/Fe oxides. 67 For example, Pb and Cu exhibit low mobility due to their affinity with the OH-(hydroxyl) functional group present on the surfaces of kaolinite, oxide, oxyhydroxides, and Fe and Al hydroxides, 68,69 which are found in the region and whose concentrations are controlled by erosion and natural leaching. 70 The control of Pb mobility is also associated with pH and high OM contents, 71 as observed in the SEPAPM, which has alkaline pH values (mean of 7.77) and OM contents between 20.97 and 41.42%.…”

Section: Metals and Arsenic Associated With Spmmentioning

confidence: 99%

Geoquímica do material particulado em suspensão em um sistema estuarino tropical, sudeste do Brasil

Monteiro¹,

Sá²,

Neto³

2017

Quim. Nova

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The aim of this study is to assess the variation of the geochemistry of suspended particulate matter (SPM) in the tropical estuarine system composed of the adjacent Piraquê-Açu and Piraquê-Mirim (ES) rivers using SPM sampled with sediment traps (45 µm mesh) installed in the drainage channels. We collected SPM during different tidal stages and seasonal periods and analysed the metals using inductively coupled plasma mass spectrometry according to EPA 3051A, the mineralogy using X-ray diffraction, the particle size using laser ray diffraction, and organic matter (OM) using calcination. The traps collected enough SPM to perform analyses for each sampling period. The SPM consists of silt size particles, and the percentage of OM is between 20 and 40%. The particles are dominated by kaolinite and quartz, and gibbsite, haematite, goethite, and pyrite are also present. These materials are found in the Barreiras Formation, through which the drainage system cuts. The metal concentrations were higher in the summer: Al (3208.32 g kg ). The Piraquê-Açu River had higher metal concentrations than the Piraquê-Mirim River, and the geochemical indices of both rivers indicate that they naturally contribute to the estuarine system of the Piraquê-Açu and Piraquê-Mirim rivers (SEPAPM). However, anthropic interferences influence these indices at the confluence of the two channels.Keywords: sediment trap; metals; mineralogy; Piraquê-Açu. INTRODUCTIONEstuaries are transitional environments that act as biogeochemical filters that retain dissolved and particulate material, including pollutants.1-4 Because they are largely influenced by hydrodynamic processes (waves, currents, and tides), estuaries distribute these elements and determine whether the system is a retainer or an exporter.5 Several studies have addressed the chemical composition and transport of suspended particulate matter (SPM; ≥ 0.45 µm) from estuarine regions to the adjacent coastal zones, mainly to quantify the continental contribution to the oceans. [6][7][8][9][10][11] However, few studies have been conducted in estuaries located in small and medium river basins in tropical regions, especially in those where human impacts are not yet evident. Understanding the geochemistry of SPM and the processes that influence it in estuarine systems has become a challenge when considering conditioning parameters such as rainfall, river discharge, the concentrations of major and trace elements and the physicochemical variables that may modify the geochemical behaviour of the SPM.To address these issues, the estuarine system of the Piraquê-Açu and Piraquê-Mirim rivers (SEPAPM) was studied to 1) evaluate if the geochemistry of the SPM of these two adjacent fluvial channels with different drainages varies 12,13 and 2) test if a sediment trap can be used to collect SPM considering the difficulty of sampling SPM with conventional methods, which require filtering many litres of water to acquire sufficient material for the geochemical analysis. Study areaThe SEPAPM is located in the municipa...

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Sediment-associated contaminants ? an overview of scientific bases for developing remedial options

Cited by 69 publications

References 153 publications

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

Mercury concentration in fish from Piracicaba River (Minas Gerais, Brazil)

Geoquímica do material particulado em suspensão em um sistema estuarino tropical, sudeste do Brasil

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