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Speciation of selenium in stream insects using X-ray absorption spectroscopy.

Ruwandi Andrahennadi1, Mark Wayland, Ingrid J Pickering

  • 1Department of Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada.

Environmental Science & Technology
|December 14, 2007
PubMed
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Selenium biotransformation in insects is key to understanding environmental contamination. X-ray absorption spectroscopy revealed varied selenium chemical forms in aquatic insects, influencing toxicity and trophic transfer.

Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Analytical Chemistry

Background:

  • Environmental selenium contamination poses risks to wildlife.
  • Insects are crucial in selenium's food chain transfer, but uptake mechanisms are unclear.
  • Selenium's chemical form (speciation) in insects impacts its toxicity.

Purpose of the Study:

  • To identify the chemical forms of selenium in aquatic insects.
  • To understand how insects biotransform selenium.
  • To assess selenium's impact on insect health and food webs.

Main Methods:

  • Utilized X-ray absorption spectroscopy (XAS) to analyze selenium speciation.
  • Collected insects from selenium-contaminated streams near Hinton, Alberta.
  • Examined various insect orders including mayflies, stoneflies, caddisflies, and craneflies.

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Main Results:

  • Observed diverse selenium speciation across different insect groups.
  • Found higher inorganic selenium in primary consumers than predators.
  • Identified organic selenides as a major selenium form; trimethylselenonium noted in caddisfly pupae.

Conclusions:

  • Insect selenium biotransformation influences toxicity and elimination.
  • XAS is effective for studying trace heavy element effects in field-collected insects.
  • Findings offer insights into insect adaptation to selenium contamination.