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Toxicity reduction evaluation, toxicity identification evaluation and toxicity tracking in direct toxicity assessment
Matt Hutchings1, Ian Johnson, Elaine Hayes
1AstraZeneca, Brixham Environmental Laboratory, Freshwater Quarry, Brixham Devon TQ5 8BA, UK. matt.hutchings@brixham.astrazeneca.com
Ecotoxicology (London, England)
|October 7, 2004
Summary
Toxicity reduction evaluations in River Esk and Lower Tees Estuary identified pesticides and cyanide as key toxicants. Further investigation is needed to pinpoint exact sources and fully account for observed environmental toxicity.
Area of Science:
- Environmental Chemistry
- Ecotoxicology
- Water Quality Assessment
Background:
- Toxicity Reduction Evaluations (TREs) are crucial for managing aquatic ecosystems.
- Standard USEPA approaches were adapted for site-specific challenges in River Esk and Lower Tees Estuary.
Purpose of the Study:
- To understand the sources and types of toxicants in River Esk and Lower Tees Estuary.
- To implement adapted Toxicity Reduction Evaluations (TREs) and Toxicity Identification Evaluations (TIEs).
Main Methods:
- Combined toxicity tracking and Toxicity Identification Evaluations (TIE).
- Utilized high-throughput methods and standard test organisms for complex sewerage networks.
- Chemical analysis to identify specific toxic agents.
Main Results:
- In River Esk, organophosphate pesticides (diazinon, propetamphos) were implicated but did not explain all toxicity.
- In Lower Tees Estuary, a significant source of toxicity was an untreated industrial effluent containing cyanide.
- Toxicity tracking identified potential sources in River Esk and key sources in Lower Tees Estuary.
Conclusions:
- Pesticides and cyanide are significant toxicants in the studied environments.
- Site-specific adaptations of TREs and TIEs are effective for identifying toxicants.
- Further research is required to fully elucidate toxicity sources and mechanisms.