Estimation of ecotoxicological potential of contaminated sediments based on a sequential extraction procedure with supercritical CO2 and subcritical H2O solvents

Heltai, György; Percsich, K.; Halasz, Gábor; Jung, Klaus; Fekete, Ilona

doi:10.1016/j.microc.2004.05.007

Cited by 32 publications

(11 citation statements)

References 13 publications

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“…Our data are low compared to literature data which are 10-20 times higher [13], indicating a low bioavailability of the trace metals for the benthic organisms living in the sediments of the studied rivers. This conclusion is in contrast to recent investigations which revealed at least for the Szamos river a potentially high environmental mobility of Zn and other metals (Cd, Cu) [8,14].…”

Section: Element Content In Benthic Organisms and Sediment Bioaccumulcontrasting

confidence: 99%

“…The highest differences were observed for Zn, Cu, Sr and Pb which were about 10 times higher concentrated in the Szamos/Maros rivers than in the Tisza river. Our results on the element content of Zn, Cu and Pb in the Szamos sediment are about three times higher than those from literature data [14]. However, this might be related to the fact that these authors analyzed the 0-10 cm sediment layer, whereas our data refer to the 0-3 cm layer which probable showed higher metal concentration due to the recent metal input.…”

Section: Element Concentration In Water and Sedimentcontrasting

confidence: 94%

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Determination of heavy metals in macrozoobenthos from the rivers Tisza and Szamos by total reflection X-ray fluorescence spectrometry

Woelfl

Mages

Óvári

et al. 2006

Spectrochimica Acta Part B: Atomic Spectroscopy

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Section: Element Content In Benthic Organisms and Sediment Bioaccumulcontrasting

confidence: 99%

Section: Element Concentration In Water and Sedimentcontrasting

confidence: 94%

Determination of heavy metals in macrozoobenthos from the rivers Tisza and Szamos by total reflection X-ray fluorescence spectrometry

Woelfl

Mages

Óvári

et al. 2006

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Due to the possible remobilization a high environmental hazard is expected. A high mobility of Zn and Cd was also observed by Heltai et al [24]. Concentrations eluted in phases 1 to 4 can be considered to be due mainly to mining activities.…”

Section: Sequential Extractionsupporting

confidence: 59%

The effects of mining in Northern Romania on the heavy metal distribution in sediments of the rivers Szamos and Tisza (Hungary)

Kraft¹,

Tümpling

Zachmann

2006

Acta hydrochim. hydrobiol.

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The breach in the dam of a tailing pond in the processing plant of a gold mine in Baia Mare (NW Romania) in January 2000 lead to an ecological disaster in the rivers Szamos and Tisza. It was mainly caused by the released slurries containing cyanides and heavy metals. The investigation of surface sediment samples and depth profiles of the years 2000 and 2001 documented the pollution of the rivers Szamos and Tisza on Hungarian territory. In the Szamos and large areas of the Tisza floodplains a significant enrichment with the heavy metals Pb, Cd, Cu, and Zn is existent. The identification of the binding forms with sequential extraction showed that Cd and Zn exist in an easily available form. Therefore the remobilization is possible and an environmental hazard in the downstream areas must be considered. The anthropogenically caused portions of heavy metal concentrations decrease considerably with increasing distance to the mining region. The comparison of the concentrations of heavy metals in both years shows that the pollution is not only caused by the accident in January 2000. The increase of concentrations is based on the permanent input of pollutants into the rivers. The pollution is mainly caused by the erosion of exposed tailing dumps and the poor maintenance of the treatment plants.

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“…Later several articles discussed the results in international scientific journals [3][4][5], among them a very comprehensive study [3] that was carried out after the accidents on the Lapuş and Szamos rivers. The latter article contains most information on the sediments taken after the accidents in 2000; however, the exact dates are not specified.…”

Section: Introductionmentioning

confidence: 99%

Comparison of sediment pollution in the rivers of the Hungarian Upper Tisza Region using non-destructive analytical techniques

Osán

Török

Alföldy

et al. 2007

Spectrochimica Acta Part B: Atomic Spectroscopy

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The rivers in the Hungarian Upper Tisza Region are frequently polluted mainly due to mining activities in the catchment area. At the beginning of 2000, two major mining accidents occurred in the Romanian part of the catchment area due to the failure of a tailings dam releasing huge amounts of cyanide and heavy metals to the rivers. Surface sediment as well as water samples were collected at six sites in the years 2000-2003, from the northeast-Hungarian section of the Tisza, Szamos and Túr rivers. The sediment pollution of the rivers was compared based on measurements of bulk material and selected single particles, in order to relate the observed compositions and chemical states of metals to the possible sources and weathering of pollution. Non-destructive X-ray analytical methods were applied in order to obtain different kinds of information from the same samples or particles. In order to identify the pollution sources, their magnitude and fate, complementary analyses were carried out. Heterogeneous particulate samples were analyzed from a large geographical territory and a 4-year time period. Individual particles were analyzed only from the "hot" samples that showed elevated concentrations of heavy metals. Particles that were classified as anthropogenic were finally analyzed to identify trace concentrations and chemical states of heavy metals.Although the Tisza river was affected by water pollution due to the two major mining accidents at the beginning of 2000, the concentration of heavy metals in sediments decreased to the mineral background level 1 year after the pollution event. In the tributaries Szamos and Túr, however, no significant decrease of the heavy metal concentrations was observed in the recent years, indicating a continuous pollution. Among the water suspended particles collected from river Túr, fibers of unknown origin were observed by electron microscopy; these particles were aluminosilicates enriched in Zn and Mn. Cd was also concentrated in this particle type. Zn in the sulfide form was observed by microbeam X-ray absorption near-edge structure analysis only in the samples collected from river Tisza in 2000, while this metal was connected to carbonates and silicates in the other samples. The dissolved Zn content of the river water and the chemical state of Zn in the fibers collected from river Túr indicate that the heavy metal pollution arrived to the Hungarian section originally mostly in the dissolved phase. The accidental heavy metal pollution of River Tisza, however, was in the form of microscopic metal sulfide particles.

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Estimation of ecotoxicological potential of contaminated sediments based on a sequential extraction procedure with supercritical CO2 and subcritical H2O solvents

Cited by 32 publications

References 13 publications

Determination of heavy metals in macrozoobenthos from the rivers Tisza and Szamos by total reflection X-ray fluorescence spectrometry

Determination of heavy metals in macrozoobenthos from the rivers Tisza and Szamos by total reflection X-ray fluorescence spectrometry

The effects of mining in Northern Romania on the heavy metal distribution in sediments of the rivers Szamos and Tisza (Hungary)

Comparison of sediment pollution in the rivers of the Hungarian Upper Tisza Region using non-destructive analytical techniques

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