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Biology is a natural science that studies life and living organisms, including their structure, function, development, interactions, evolution, distribution, and taxonomy. The field's scope is extensive and divided into several specialized disciplines, such as anatomy, physiology, ethology, genetics, and many more. All living things share a few key traits, including cellular organization, heritable genetic material and the ability to adapt/evolve, metabolism to regulate energy needs, the...
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When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
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A Whole Cell Bioreporter Approach to Assess Transport and Bioavailability of Organic Contaminants in Water Unsaturated Systems
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Target and Nontarget Analyses Reveal Similar Dissolved Organic Contaminant Patterns Relative to Quantified Catchment

Lana G Graves1,2, Christiane Zarfl1, Tina Hirsch1,2

  • 1Department of Geosciences, Eberhard Karls University of Tübingen, Schnarrenbergstr. 94-96, 72076 Tübingen, Germany.

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River contaminant mixtures show high similarity across catchments, with concentrations increasing downstream of urban areas. Understanding these chemicals is key for water quality management and pollution control.

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Area of Science:

  • Environmental Chemistry
  • Water Quality Monitoring
  • Riverine Ecosystems

Background:

  • River water quality is impacted by various organic contaminants from human activities.
  • The longitudinal evolution of dissolved organic contaminants and their link to river catchment characteristics are not well understood.

Purpose of the Study:

  • To investigate the longitudinal patterns of organic contaminants in two German rivers (Neckar and Spree).
  • To correlate contaminant occurrence and concentration with river catchment characteristics.
  • To assess the effectiveness of target and nontarget analyses in characterizing riverine chemical pollution.

Main Methods:

  • Collection of dry-weather water samples from two large, anthropogenically impacted German rivers.
  • Application of target and nontarget analyses to identify and quantify organic contaminants.
  • Utilized feature-based molecular networks for comprehensive contaminant profiling.

Main Results:

  • High chemical similarity observed between the two river catchments, with 81% of target contaminants detected in over 50% of sites.
  • Contaminant concentrations and feature peak areas increased within and downstream of urbanized regions.
  • Pharmaceuticals correlated with treated wastewater effluent, while polymer-related chemicals linked to urban land cover.

Conclusions:

  • River contaminant profiles exhibit significant similarity across different catchments.
  • Urbanization and wastewater effluent are major drivers of riverine organic contamination.
  • Integrated analytical approaches are crucial for a complete understanding of riverine chemical pollution and for effective water management.