Is selenium a global contaminant of potential concern?

Area of Science:

• Environmental Chemistry
• Ecotoxicology
• Aquatic Ecology

Background:

• Selenium (Se) is a contaminant increasingly detected in water bodies due to advanced analytical methods.
• Environmentally relevant concentrations of Se pose risks to aquatic organisms, yet no definitive chronic effect standards exist.
• The US Environmental Protection Agency (EPA) acknowledges the need for tissue guidelines but has not finalized them.

Purpose of the Study:

• To solicit global information on the presence and ecological significance of selenium (Se) in aquatic environments.
• To identify regions beyond North America, Australia, and New Zealand where Se contamination is a concern.
• To gather data on adverse effects of Se on fish, water birds, and amphibians.

Main Methods:

• Review of existing scientific literature and data on selenium contamination.
• Solicitation of information from the scientific community regarding Se presence and impacts.
• Synthesis of findings from the SETAC Pellston Workshop on ecological assessment of Se.

Main Results:

• The SETAC Pellston Workshop identified the state-of-the-science for aquatic Se ecological assessment.
• Information on Se contamination is currently limited to specific global regions like North America, Australia, and New Zealand.
• A comprehensive book on aquatic Se assessment will be published by SETAC Press.

Conclusions:

• Improved analytical techniques are revealing widespread selenium contamination in aquatic systems.
• There is a critical need for broader global data on selenium's ecological impacts to inform regulatory standards.
• Further research and data collection are essential to understand and mitigate selenium's risks to aquatic ecosystems worldwide.