Parent, Lise, Twiss, Michael R. et Campbell, Peter G. C. (1996). Influences of natural dissolved organic matter on the interaction of aluminum with the Microalga Chlorella: a test of the free-ion model of trace metal toxicity. Environmental Science and Technology, 30 (5), 1713-1720. 10.1021/es950718s
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| Catégorie de document : | Articles de revues |
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| Évaluation par un comité de lecture : | Oui |
| Étape de publication : | Publié |
| Résumé : | The free-ion model of trace metal interactions with aquatic microorganisms states that the biological response to a metal is proportional to the activity of the free-ion {Mz+} in solution. The applicability of the free-ion model, as it applied to the toxicity of aluminum to the green alga Chlorella pyrenoidosa in the presence of a soil fulvic acid (SFA), was tested in defined media (pH 5) designed to limit Al interactions to algae and SFA. Toxicity was not proportional to the activity of Al3+, an apparent failing of the free-ion model. Fulvic acid adsorbed to cell surfaces (17 mg m-2, pH 5) and increased membrane permeability (as measured with [14C]sorbitol) whereas Al decreased membrane permeability. In addition, SFA may act as a source of phosphorus to P-deficient algae. These results emphasize the importance of considering not only the metal-complexing properties of natural dissolved organic matter but also its direct metabolic and physiological influences on algae. |
| Déposant: | Parent, Lise |
| Responsable : | Lise Parent |
| Dépôt : | 10 dec. 2024 18:19 |
| Dernière modification : | 10 dec. 2024 18:19 |
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