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Extraction and Analysis of Triazines in Fish Tissues Following a Toxic Exposure: Environmental Factors Affecting Atrazine Toxicity in Fish.

Rapid, generic, and environmentally friendly methods for extraction and detection of the pesticides atrazine, cyanazine, metribuzin, and simazine were developed for use in monitoring the cause of pesticide related or suspect fish kills. Further, environmental hypoxia and elevated temperature were studied as possible contributors to the toxicity of atrazine in channel catfish (Ictalurus punctatus) and as synergistic factors to be considered in investigating fish kill events. Incurred residues from the exposure of catfish to atrazine alone or hypoxia or elevated temperature and atrazine were also analyzed. A commercial enzyme-linked immunoassay (ELISA) was utilized as a screening method for the presence of atrazine in fortified fish tissue with extracts obtained from matrix solid phase dispersion (MSPD) . Under conditions for the toxicity of atrazine and hypoxia test, tissue concentrations determined by HPLC in exposed fish were 22.1 ppm in the muscle and 32.8 ppm in the liver under normoxia; under hypoxia, concentrations were 22.4 ppm in the muscle and 35.3 ppm in the liver. In addition, fish exposed to hypoxia and atrazine died sooner than fish exposed to normoxia and atrazine. For the elevated temperature and atrazine toxicity test, tissue concentrations were 17.2 ppm in the muscle and 27.2 ppm in the liver at ambient