News - Aquatic Ecotoxicology

31. January 2018, Topic: Aquatic Ecotoxicology, Sediment Ecotoxicology, Risk Assessment

Symposium "Environmental Monitoring with Bioassays" on 5./6. June 2018

Symposium "Environmental Monitoring with Bioassays" on 5./6. June 2018

The use of bioassays to assess water quality has many advantages and the acceptance of bioassays has increased in recent years. For this reason, the Ecotox Centre organises a symposium on the topic.

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22. December 2017, Topic: Aquatic Ecotoxicology, Risk Assessment

Eawag supports introduction of effect-based environmental quality criteria

Eawag supports introduction of effect-based environmental quality criteria

At the end of November, the Federal Council has sent the new risk-based required limits for biocides, plant protection products and other micro-pollutants within the Water Protection Ordinance in consultation. A new Eawag fact sheet shows why these values are meaningful and necessary.

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24. November 2017, Topic: Aquatic Ecotoxicology, Risk Assessment

Estrogens in surface waters - Screening and risk assessment for Europe

Estrogens in surface waters - Screening and risk assessment for Europe

In the framework of an international project, European water samples were analysed for estrogens using various biological and chemical methods. Bioassays based on cell cultures were shown to be well suited to detect the substances that are to be monitored across Europe.

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24. November 2017, Topic: Aquatic Ecotoxicology

Immunotoxicity: an underestimated ecotoxicological effect of chemicals

Immunotoxicity: an underestimated ecotoxicological effect of chemicals

Numerous substances influence the ability of wild animals to cope with pathogens. However, there are no established bioassays in ecotoxicology to screen environmental samples and chemicals for immunotoxic effects. The Ecotox Centre would like to improve this situation.

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24. November 2017, Topic: Aquatic Ecotoxicology, Soil Ecotoxicology, Sediment Ecotoxicology, Risk Assessment

 Info sheet on pyrethroides

Info sheet on pyrethroides

Pyrethroids are among the most frequently used pesticides in the world. For this reason, the Ecotox Centre has published a new info sheet on the emissions, mechanism of action, toxicity and risk of the substances.

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23. November 2017, Topic: Aquatic Ecotoxicology, Risk Assessment

How long to collect water samples?

How long to collect water samples?

If the measured concentration of a substance in surface waters exceeds its quality criterion, the water quality is assessed as poor. But over which time period should the water sample be collected and the concentration be averaged?

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01. June 2017, Topic: Aquatic Ecotoxicology, Risk Assessment

Ecosystem stress caused by micropollutants

Ecosystem stress caused by micropollutants

Micropollutants enter rivers and streams in effluents discharged from wastewater treatment plants (WWTPs). As well as having adverse impacts on individual species, these substances appear to alter aquatic ecosystem functions, such as litter decomposition.

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30. May 2017, Topic: Aquatic Ecotoxicology, Risk Assessment

Ecotoxicological risks in small streams are high

Ecotoxicological risks in small streams are high

A comprehensive monitoring study in small Swiss streams shows that these are often heavily contaminated with plant protection products. The ecotoxicological risk due to the pollutant mixtures was high at four of the five examined sites and the water quality therefore considered to be bad. Due to the long-term exposure, there were no time for recovery for the water organisms.

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30. May 2017, Topic: Aquatic Ecotoxicology, Sediment Ecotoxicology, Risk Assessment

Priorisation of pollutants for sediment monitoring in Switzerland

Priorisation of pollutants for sediment monitoring in Switzerland

The Ecotox Centre has prioritised organic pollutants for sediment monitoring. The resulting list provides a basis for the sediment module of the Modular Stepwise Procedure.

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23. May 2017, Topic: Sediment Ecotoxicology, Aquatic Ecotoxicology

Do stormwater overflows in Lake Geneva contribute to sediment pollution?

Do stormwater overflows in Lake Geneva contribute to sediment pollution?

Trough the discharge of untreated rainwater, surface waters can be contaminated with heavy metals and organic pollutants. A combination of chemical and biological studies has shown that these substances in Lake Geneva reach the sediments and lead to a shift towards more resistant species.

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