Passaic river sediment interstitial water phase I toxicity identification evaluation.

Area of Science:

• Environmental Toxicology
• Ecotoxicology
• Marine Biology

Background:

• Passaic River sediments exhibit toxicity.
• Identifying the specific toxicants is crucial for environmental remediation.

Purpose of the Study:

• To evaluate and identify the causes of toxicity in Passaic River sediments.
• To determine the role of different contaminants in sediment toxicity.

Main Methods:

• Whole sediment bioassays using marine amphipod Ampelisca abdita.
• Interstitial water bioassays with A. abdita and Vibrio fisheri (Microtox((R))).
• Phase I Toxicity Identification Evaluation (TIE) and chemical residue analysis.

Main Results:

• Whole sediment bioassays showed significant amphipod mortality across all tested stations.
• Interstitial water bioassays and Microtox((R)) assays did not indicate significant toxicity.
• Toxicity was reduced by filtering interstitial water, suggesting particle-associated toxicants.

Conclusions:

• Particle-associated neutral organics are the likely cause of sediment toxicity.
• Dissolved phase contaminants, oxidants, and soluble metals were not primary toxicants.
• Results support targeted remediation strategies for Passaic River sediments.