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Chemical pollution of European waters is stronger than anticipated
Date:6/17/2014

the Rhine River at a pan-European level. For the first time, the extent to which risk thresholds were exceeded for three groups of organisms, namely fish, invertebrates and algae / primary producers, was estimated for these major river basins. The data used originated from official water monitoring activities of recent years. The scope of sampling consequently varied significantly in terms of spatial coverage, as well as timing, therefore, direct comparison(s) between different countries proves rather difficult. For example, the study finds, that water quality is worst in France, presumably due to the fact that authorities in this country installed a dense monitoring network and analyzed water samples for a multitude of substances, including the ecotoxicological relevant compounds. In other countries, by contrast, risks may remain unrecognized due to inadequate sensitivity in chemical analysis or an incomplete list of ecotoxicologically relevant monitoring compounds. "Generally speaking we probably underestimated rather than overestimated the risks in our analyses", comments the head of the research study team, Jun.-Prof. Dr. Ralf B. Schfer from the Institute for Environmental Sciences Landau. "The actual state and condition of European freshwater ecosystems is probably even worse."

The primary factors contributing to chemical contamination of aquatic ecosystems are the discharge from agricultural activities, urban areas and municipal sewage treatment plants. Pesticides were by far the major toxicants of freshwater systems, although, organotin compounds, brominated flame retardants and combustion-derived polycyclic aromatic hydrocarbons, also occurred at critical levels of concentration. EU requirements and targets regarding water quality currently focus primarily on the occurrence of the so-called priority substance, i.e. around 40 chemicals classified as being particularly hazardous to the aquatic environment. "Fortunately the use of many of these prior
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Contact: Tilo Arnhold
presse@ufz.de
49-341-235-1635
Helmholtz Centre for Environmental Research - UFZ
Source:Eurekalert  

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