A novel water treatment process Can humic acid be used as a complexing agent to remove hydrophobic pollutants from contaminated water? M. Rebhun and co-workers studied a novel, two-step water treatment process in which humic acid was first added to polluted water and allowed to bind with PAH contaminants. The resulting humic acid-pollutant complex was then removed by flocculation with added alum or ferric chloride. Results indicate that the complexes did not disintegrate during addition of flocculants and that the process efficiently removed PAHs. Flocculation of humic acids is facilitated by their acidic hydrophilic sites. Moreover, their hydrophobic moieties allow association with nonionic solutes. The authors suggest that adding dissolved humic acids during the flocculation step of water treatment processes is an efficient, cost-effective means to remove hydrophobic compounds such as PAHs, PCBs, and DDT. (Environ. Sci. Technol., this issue, pp. 981-986)
O Z O N E DIPLOMACY New Directions in Safeguarding the Planet Enlarged
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Richard Benedick—a principal architect and the chief U.S. negotiator of the Montreal Protocol—expands the ozone story, bringing us to the eve of the tenth anniversary of the signing of the historic treaty. He describes subsequent negotiations to deal with unexpected major scientific discoveries and important amendments adding new chemicals and accelerating the phaseout schedules. Ozone Diplomacy is essential reading for those concerned about the future of our planet. "A landmark book that should command the attention of every serious student of American diplomacy, international environmental issues, or the art of negotiation." —FOREIGN SERVICE JOURNAL 512 pp. • $18.95 paper • $.39.95 cloth
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Sediment toxicants. A simple method was developed and used to detect, identify, and confirm toxic compounds in contaminated sediment pore waters. Ammonia was confirmed as the main toxic agent. The practicality of the toxicity identification evaluation procedure was demonstrated. (Van Sprang, R A.; Janssen, C. R. "Identification and Confirmation of Ammonia Toxicity in Contaminated Sediments Using a Modified Toxicity Identification Evaluation Approach," Environ. Toxicol. Chem. 1997, 16 (12), 2501-2507)
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Contributors: Michael Brauer, University of British Columbia, Vancouver, Canada; Brian Eitzer, Connecticut Agricultural Experiment Station, New Haven, Conn.; Stephen Geiger, Remediation Technologies, Inc., King of Prussia, Pa.; Vincent Hand, Miami University, Institute of Environmental Sciences, Oxford, Ohio; Louis Kovach, Ecolife Associates, Wilmington, Del; Geoffrey Nobes, McGill University, Montreal, Canada; and Raewyn Town, Queen's University of Belfast, Northern Ireland.
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