Ozonization of humic acids. Medium term toxicity towards daphnia magna

Journal Article · · Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States)

DOI:https://doi.org/10.1080/01919518608552302· OSTI ID:6057218

Imbenotte, M; Pommery, J; Pommery, N; Erb, F ^[1]

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1. Faculte de Pharmacie, Lille (France)

The ozonation products of humic acids are toxicologically interesting because their actual toxicity and also because of their complexing capacity of metals present in water which are, incompletely eliminated by potabilization techniques. Determination of the ultimate toxicity of ozonized humic acids is achieved with the aid of the medium term Daphnia magna test. Statistical treatment of the two lethal parameters and of the four sublethal parameters have shown a toxicity for ozonized humic acids in solution, at a concentration of 100 mg.L{sup {minus}1}. Ultrafiltration has allowed isolation of those fractions discovered to be responsible for complexing of metals. The first fraction is toxic only after ozonation, and uniquely on a level of a number of ranges. From the results of the chemical structure of the compounds under the effect of ozonation, it is noted, medium term toxicity can be related to the increase in aromatic character, which practically triple in the intermediate mass fraction. Mutagenic activity of humic materials and of their ozonization or chlorination products has been studied recently. This form of toxicity appears during chlorination of humic acids and ozonization of natural fulvic acids. These latter molecules therefore are interesting from a toxicological point of view, because of their own toxicity and their complexing ability towards trace metals that are consequently not completely eliminated by purification processes. Nevertheless, complexation with humic acids lessens the toxicity of metals. By changing the chemical structure of humic materials, ozonization causes degradations with formation of new functional groups and variations in the proportions of free and complexed metal species. It thus constitutes an important water purification step which strongly influences overall toxicity, depending on both the structure of ozonization products and the extent of complexation of trace metals.

• OSTI ID: 6057218
• Journal Information: Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States), Journal Name: Ozone: Science and Engineering (The Journal of the International Ozone Association); (United States) Vol. 8:1; ISSN OZSED; ISSN 0191-9512
• Country of Publication: United States
• Language: English

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