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Long-term ozone consumption by aquatic fulvic acids acting as precursors of radical chain reactions

Article Abstract:

The way in which aquatic fulvic acids consumed ozone was studied, along with the impact of various reaction parameters. The focus was on the way that ozone consumption was affected by radical scavengers so that precursors to radical chain reactions could be identified. The results indicated that relative ozone consumption increased at a greater rate when scavengers were not present. This indicated that radical chain reactions occurred between ozone and fulvic acids. The precursors of the reactions were found to be hydrogen peroxide and glyoxalic acid.

Author: Feng Xiong, Croue, Jean-Philippe, Legube, Bernard
Publisher: American Chemical Society
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
Chemical reaction, Rate of, Chemical kinetics, Ozonization

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Chlorination and formation of organoiodinated compounds: the important role of ammonia

Article Abstract:

A study investigates the conditions of formation of organoiodinated compounds responsible of medicinal tastes and odors often observed after chlorination of waters containing iodides. Results reveal that ammonia or organic amines contribute in iodorm formation during chlorination of iodides containing waters at amine ratios corresponding to the presence of inorganic or organic chloramines. Nitrogenated molecules such as amines and amino acids, however, have limited role in the production of organoiodinated compounds during chlorination.

Author: Legube, Bernard, Vel Leitner, Karpel, Nathalie, Vessella, Johanne, Dore, Marcel
Publisher: American Chemical Society
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
Water Supply and Irrigation Systems, Water supply, Water Treatment, Nitrogenous Fertilizer Manufacturing, Nitrogenous fertilizers, Ammonia, Chlorination

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Synchronous fluorescence spectra of metal-fulvic acid complexes

Article Abstract:

The binding of dissolved organic matter (DOM) to metal ions in natural waters is an important regulator of metal toxicity, transport and bioavailability. Fluorescence spectroscopy measures the DOM ligand, as opposed to techniques that simply measure metal concentrations. Synchronous quenching spectra of the complexation of divalent transition metal ions by fulvic acid are used to examine binding site heterogeneity and competition between metals for binding sites.

Author: Cabaniss, Stephen E.
Publisher: American Chemical Society
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1992
Health aspects, Usage, Coordination compounds, Fluorescence spectroscopy

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Subjects list: Research, Fulvic acids, Water
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