45 papers present the development of new reserach techniques, synopses of available techniques, findings concerning various environmental stressors, and the application of techniques and processes to environmental assessment.

In eight sections:

• Aquatic Toxicology and Use of Experimental Ecosystems

• Biomarkers

• Effluent Toxicity and Simulated Treatment

• Environmental Neurotoxicology

• Plants for Toxicity Assessments

• Risk Assessment

• SAR/QSAR in the Office of Pollution Prevention and Toxics

• Sediment Toxicology.