Pharmaceuticals in the river Elbe and its tributaries

Area of Science:

• Environmental Chemistry
• Water Quality Monitoring
• Ecotoxicology

Background:

• Medicinal drugs are increasingly detected in aquatic environments globally.
• Wastewater treatment plants are a primary source of pharmaceutical pollution.
• The ecological impact of pharmaceutical contamination remains poorly understood.

Purpose of the Study:

• To investigate the occurrence and distribution of pharmaceuticals in the Elbe river and its tributaries.
• To identify the sources of pharmaceutical pollution in the aquatic system.
• To highlight the need for risk assessment and regulatory action regarding pharmaceutical residues.

Main Methods:

• Extensive water sampling across the Elbe river and its tributaries over several years (1998-2002).
• Analysis of various pharmaceuticals, including diclofenac, ibuprofen, carbamazepine, and metabolites like AAA and FAA.
• Multivariate statistical analysis to understand substance distribution and correlations.

Main Results:

• Pharmaceuticals were ubiquitously detected in the Elbe and Saale rivers and their tributaries.
• Treated wastewater from municipal sewage treatment works was identified as the main emission source.
• Concentrations of specific drugs and their metabolites were quantified, with some metabolites contributing significantly to total pharmaceutical load.
• Tributary inflow influenced pharmaceutical concentrations, either increasing or decreasing them based on wastewater load.
• Carbamazepine showed ubiquitous occurrence in surface waters in Saxony.

Conclusions:

• Medicinal substances in rivers can serve as indicators of human-induced water pollution.
• Current ecotoxicological effects are difficult to assess due to a lack of established legal frameworks and research.
• There is an urgent need to include significant pharmaceutical substances in environmental risk assessment concepts.