Assessing the biological relevance of exposing freshwater organisms to atrazine and molinate in environmentally realistic exposure test systems

Latt Phyu Yin, Michael St J. Warne, Richard P. Lim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Assessing the toxicity of chemicals in treated laboratory water may not accurately represent the toxicity of chemicals in natural aquatic systems. In natural water, dissolved organic matter, suspended particulate matter, and sediment play key roles in the sorption of contaminants from the water. Our previously published series of papers illustrated that the presence of sediment in aquatic toxicity testing systems significantly (p < 0.05) reduced the bioavailability of the herbicides atrazine and molinate to five Australian freshwater organisms. It is not clear whether the reduced bioavailability means that the trigger values (TVs) in the current Australian and New Zealand water quality guidelines, which are calculated using toxicity data from water-only toxicity tests, provide appropriate environmental protection. Several new sets of TVs were derived in the present study and were compared to each other and to the current Australian and New Zealand TVs for atrazine and molinate. The current Australian and New Zealand TVs for atrazine and molinate provided appropriate protection to Australian freshwater species. Australian freshwater species have a sensitivity distribution similar to those of overseas species to atrazine and molinate.

Original languageEnglish
Pages (from-to)420-424
Number of pages5
JournalEnvironmental Toxicology and Chemistry
Volume27
Issue number2
DOIs
Publication statusPublished - 1 Feb 2008
Externally publishedYes

Keywords

  • Atrazine
  • Bioavailability
  • Molinate
  • Trigger values
  • Water quality guidelines

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis

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