Aquatic toxicity of dyes before and after photo-Fenton treatment
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Data
2014-07-15
Autores
Luna, Luis A. V. de
Silva, Thiago H. G. da [UNESP]
Pupo Nogueira, Raquel F. [UNESP]
Kummrow, Fabio
Umbuzeiro, Gisela A.
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Editor
Elsevier B.V.
Resumo
This study evaluated the ecotoxicity of five dyes to freshwater organisms before and during their photo-Fenton degradation. EC50 (48 h) of the five tested dyes ranged from of 6.9 to >1000 mg L-1 for Daphnia similis. In the chronic tests IC50 (72 h) varied from 65 to >100 mg L-1 for Pseudokirchneriella subcapitata and IC50 (8 days) from 0.5 to 410 mg L-1 for Ceriodaphnia dubia. Toxicity tests revealed that although the applied treatment was effective for decolorization of the dye, the partial mineralization may be responsible for the presence of degradation products which can be either more toxic than the original dye, as is the case of Vat Green 3 and Reactive Black 5, lead to initially toxic products which may be further degraded to non toxic products (acid Orange 7 and Food Red 17), or generate non toxic products as in the case of Food Yellow 3. The results highlighted the importance of assessing both acute and chronic toxicity tests of treated sample before effluent discharge. (C) 2014 Elsevier B.V. All rights reserved.
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Palavras-chave
Reactive Black 5, Vat Green 3, Acid Orange 7, Food Yellow 3, Food Red 17
Como citar
Journal Of Hazardous Materials. Amsterdam: Elsevier Science Bv, v. 276, p. 332-338, 2014.