XII Congresso Brasileiro de Ecotoxicologia
25 a 28 de setembro de 2012
Porto de Galinhas – PE
EFFECTS OF AZO DYE DISPERSE RED 1 BEFORE AND AFTER
PHOTOELECTROCATALYTIC TREATMENT TO AN ESTUARINE COPEPOD
Mariana C. Artal1; Guilherme R. Lotufo2; Juliano Carvalho3, Maria Valnice B. Zanoni3;
Gisela A. Umbuzeiro1
1
[email protected] (Faculdade de Tecnologia da UNICAMP, Limeira, São Paulo)
[email protected] (U.S. Army Engineer Research and Development Center, Vicksburg, Mississippi)
3
[email protected] (Universidade Estadual Paulista “Júlio de Mesquita Filho”, Araraquara, São
Paulo)
3
[email protected] (Universidade Estadual Paulista “Júlio de Mesquita Filho”, Araraquara, São Paulo)
1
[email protected] (Faculdade de Tecnologia da UNICAMP, Limeira, São Paulo)
2
Dyes can be considered emerging contaminants because they are not yet regulated and are present in the
environment. Azo dyes are the most produced and commercialized worldwide. These compounds have been
detected and related to the mutagenic activity in the environment, however, ecotoxicological effects of these
compounds are poorly explored, especially in marine environments. Besides the toxicity evaluation it is
essential to propose new and effective treatments to remove color and toxicity of these compounds.
Advanced oxidation processes appear as an emerging proposal for the treatment of these contaminants. The
toxicity of the Disperse Red 1 was evaluated before and after two hours of a photoelectrocatalytic process
using the estuarine copepod Nitokra sp. The endpoints evaluated were immobility and egg hatching success.
The photoelectrochemical treatment was performed in the presence of sea salt as electrolyte support.
Titanium nanotube arrays self-organized were used as working electrode followed by Ag/AgCl KCl 3-Mol
as a reference electrode and a plate of titanium coated with a layer of ruthenium chloride as the auxiliary
electrode. The concentration of Disperse Red 1 treated was 100 mg L -1. Aliquots were withdrawn at different
times and the loss of color was monitored. The EC50(96h) for immobility was 0.92 mg.L-1 and 1.9 mg.L-1 for
the dye solution before and after treatment, respectively. There were no effects on egg hatching rate of
exposed organisms until the highest tested dye concentration of 1 mg.L-1 and 5 mg.L-1 before and after
treatment, respectively. The treatment was not efficient in removing the toxicity under the tested conditions
and the identity of the generated products are being elucidated.
Keywords: Nitokra sp, ecotoxicity, Disperse Red 1
Acknoledgements: FAPESP (2008/10449-7) and (2010/14033-0).
Sociedade Brasileira de Ecotoxicologia (SBE)
Universidade Federal de Pernambuco (UFPE)
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