Biotests an Sedimenten

Ahlf, Wolfgang

doi:10.1002/9783527678488.hbal1995009

Cited by 9 publications

(9 citation statements)

References 196 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Bacteria toxicity is permanently a significant part of the overall toxicity at the hot spots. It is probably caused rather by organic contaminants like PAHs [29] than by heavy metals [30]. The peak in the bacteria toxicity at the monitoring sites in the middle of the 1990s could be caused by PAHs, too.…”

Section: Resultsmentioning

confidence: 99%

Results of Long‐term Sediment Quality Studies on the River Elbe

Heininger

Pelzer

Claus

et al. 2003

Acta hydrochim. hydrobiol.

View full text Add to dashboard Cite

The results of long-term studies in the Upper and Middle Elbe River between 1991 and 2001 are presented and the temporal and spatial trends in sediment contamination and toxicity are studied. Although the concentrations of heavy metals and arsenic have significantly decreased in the last 10 years for most of the toxic elements they are still far from natural background values. For organic priority pollutants increasing as well as decreasing trends are observed, depending on the Elbe reach and/or the parameter under consideration. Elbe sediments have a permanent measurable toxicity. It is usually low in terms of aquatic tests as far as the persisting hot spots are not considered. Whole sediment testing with nematode Caenorhabditis elegans which was started in 1997 revealed clear toxic effects. In contrast to the priority pollution situation, no significant trend could be found in general sediment toxicity between 1992 and 2001. Ergebnisse von Langzeituntersuchungen zur Sedimentqualität in der ElbeEs werden Ergebnisse langjähriger Untersuchungen in der Ober-und Mittelelbe aus dem Zeitraum 1991-2001 vorgestellt. Die zeitlichen und örtlichen Trends in der Schadstoffbelastung der Sedimente und ihrer Toxizität werden diskutiert. Obwohl die Konzentrationen für Schwermetalle und Arsen in den letzten zehn Jahren signifikant abgenommen haben, sind sie für die meisten der toxischen Elemente noch weit von den natürlichen Hintergrundwerten entfernt. Bei den organischen Schadstoffen werden in Abhängigkeit von dem betrachteten Elbeabschnitt und/oder Parameter sowohl zu-als auch abnehmende Trends beobachtet. Elbesedimente zeigen ständig messbare toxische Effekte. Sie sind in aquatischen Tests gewöhnlich niedrig, sofern nicht die bestehenden Hot spots betrachtet werden. In den 1997 begonnenen Gesamtsedimenttests mit dem Nematoden Caenorhabditis elegans wurden deutliche toxische Wirkungen nachgewiesen. Im Gegensatz zur Situation bei den prioritären Schadstoffen zeigte sich für die Sedimenttoxizität zwischen 1992 und 2001 kein signifikanter Trend.

show abstract

Section: Resultsmentioning

confidence: 99%

Results of Long‐term Sediment Quality Studies on the River Elbe

Heininger

Pelzer

Claus

et al. 2003

Acta hydrochim. hydrobiol.

View full text Add to dashboard Cite

show abstract

“…Most importantly, the lack of embryotoxic effects in sediments from the site Eberbach 1 documents that the zebrafish embryo contact assay is capable of identifying non-toxic native sediments showing an embryotoxicity comparable to those of (sterilized) W4 quartz powder and pure water controls. Acetonic extracts are commonly believed to assess the total potential toxicity and to, therefore, overestimate the actual bioavailable toxicity of sediments (Ahlf 1995, Burton 1991. As a consequence, a critical re-evaluation of the relevance of results obtained by means of organic extracts has repeatedly been postulated.…”

Section: Embryo Toxicity Of Native Sediments and Organic Extractsmentioning

confidence: 99%

A new sediment contact assay to assess particle-bound pollutants using zebrafish (danio rerio) embryos

Hollert

Keiter

König

et al. 2003

J Soils & Sediments

201

View full text Add to dashboard Cite

A new sediment contact assay to assess particle-bound pollutants using zebrafish (Danio rerio) embryos. Soils and Sediments, http://dx.doi.org/10.1065/jss2003.09.085 Journal ofAccess to the published version may require subscription. Conclusions.A modified protocol of the zebrafish embryo test allows the assessment of sediment toxicity in both aqueous extracts and native sediments. The isolated investigation of pore waters may result in a clear-cut underestimation of the bioavailability of lipophilic particle-bound substances (as determined by native sediments). Recommendations and Perspectives.The zebrafish embryo test with native (whole, solid phase) sediments appears very promising for the evaluation of the bioavailable fraction of lipophilic particle-bound substances and can therefore be recommended for the evaluation of vertebrate toxicity in tiered sediment test strategies and dredging directives such as the HABAB-WSV. Whereas acetone extracts may be tested as a rough estimation of embryotoxicity, native sediment samples will provide a more comprehensive and realistic insight into the bioavailable hazard potential. (2) to compare the hazard potential of solid phase sediments to the effects of corresponding pore waters and organic extracts in order to characterize the bioavailability of the particle-bound pollutants; and (3) to relatively evaluate the embryotoxic effects of sediments from the catchment areas of the rivers Rhine, Neckar and Danube. Keywords Methods (or Main Features).To investigate the toxicity of sediment samples on vertebrates, the standard embryo toxicity test with the zebrafish (Danio rerio; Hamilton-Buchanan 1922) according to DIN 38415-6 was modified with respect to exposure scheme and toxicological endpoints. Sediments from the catchment area of the Neckar River were assessed using pore waters, acetonic extracts and native sediments in order to get inside into the potential bioavailability of particle-bound pollutants. A comprehensive test protocol for the investigation of native sediments in the embryo toxicity test with the zebrafish is presented.Results and Discussion. The fish embryo assay with Danio rerio can be carried out with both aqueous and organic sediment extracts as well as native (whole, solid phase) sediment samples. Elongation of exposure time from 48 to up to 196 h significantly increased the mortality. Using the fish egg assay with native sediments, a broad range of embryotoxic effects could be elucidated, including clear-cut dose-response curves for the embryotoxic effects of contaminated sediments; in contrast, absence of embryotoxic effects could be demonstrated even for the highest test concentrations of unpolluted sediments. With native sediments, embryotoxicity was clearly higher than with corresponding pore waters, thus corroborating the view that -at least for fish eggs -the bioavailability of particle-bound lipophilic substances in native sediments is higher than generally assumed. The relative ranking of sediment toxicity was identical using both nati...

show abstract

“…Dr. Henner Hollert RWTH Aachen University, Department of Ecosystem Analysis 52076 Aachen Germany Dear Wolfgang, When writing my Diploma thesis on toxic effects of sediment and suspended particulate matter from flood events in 1996 at Heidelberg University I found a great chapter on sediment toxicology written by you in the Handbook on Applied Ecology [10]. This chapter, mainly based on your habilitation thesis, was very inspiring to me.…”

Section: Laudation Henner Hollertmentioning

confidence: 99%

Laudation to PD Dr. Wolfgang Ahlf: towards integrated approaches in sediment toxicology and its transfer to sediment quality guidelines

et al. 2015

View full text Add to dashboard Cite

Thanking PD Dr. Wolfgang Ahlf on the occasion of his retirement for his outstanding experimental and conceptual merits in the field of sediment ecotoxicology and his personal 65th anniversary this article will present a laudation. This Editorial furthermore introduces a series of papers on 'Progress in sediment research and decision making' which is dedicated to Wolfgang Ahlf, one of the longstanding and leading experts in the field of sediment research. We cordially invite all colleagues who feel they can contribute to the topic to submit a manuscript to ESEU with reference to this series.

show abstract

Biotests an Sedimenten

Cited by 9 publications

References 196 publications

Results of Long‐term Sediment Quality Studies on the River Elbe

Results of Long‐term Sediment Quality Studies on the River Elbe

A new sediment contact assay to assess particle-bound pollutants using zebrafish (danio rerio) embryos

Laudation to PD Dr. Wolfgang Ahlf: towards integrated approaches in sediment toxicology and its transfer to sediment quality guidelines

Contact Info

Product

Resources

About