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ENVIRONMENTAL RISK OR BENEFIT? COMPREHENSIVE RISK ASSESSMENT OF GROUNDWATER TREATED WITH NANO FE0-BASED CARBO-IRON®
Weil, M., K. Mackenzie, K. Foit, D. Kuehnel, W. Busch, M. Bundschuh, R. Schulz, and K. Duis.
Science of the Total Environment 677:156-166(2019)

Carbo-Iron® is a composite of zero-valent nano-iron and active carbon. In a study of the environmental risk of the in situ remediation agent, existing ecotoxicity data were complemented by studies with Daphnia magna (Crustacea), Scenedesmus vacuolatus (Algae), Chironomus riparius (Insecta), and nitrifying soil microorganisms. The predicted no-effect concentration of 0.1 mg/L (derived from acute and chronic ecotoxicity studies) was compared to environmental concentrations measured and modeled in a field study of Carbo-Iron applied in a groundwater contaminated with chlorohydrocarbons, and risk ratios were derived. The study data showed about a 50% decrease in the total environmental risk in the heavily contaminated zones after Carbo-Iron application, which suggests the benefit of remediation with Carbo-Iron outweighs its negative effects on the environment.



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