The use of the marine copepod - Nitokra sp. in the toxicity evaluation of dyes.

Author(s)

Mariana Coletty Artal

• Document type: Master's Dissertation
• Press: Limeira, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Tecnologia
• Defense date: 2013-05-02

Examining board members

Gisela de Aragão Umbuzeiro; Elisangela Franciscon; Fábio Kummrow

• Advisor: Guilherme Ribeiro Lotufo; Gisela de Aragão Umbuzeiro

Abstract

Production and use of dyes represent relevant numbers in the world and in Brazil. Ecotoxicological effects of these compounds, especially to estuarine and marine organisms are unknown. This study evaluated the toxicity of the azo dye CI Disperse Red 1 and CI Disperse Red 13 to an estuarine copepod Nitokra sp. evaluating adverse effects measured as immobility and egg hatching success before and after photoelectrochemical treatment. Both dyes Disperse Red 1 and Disperse Red 13 were toxic with immobility effective concentration EC50 (96h) in the range of 0.3 to 2.1 mg.L-1 (n= 4) and 1.5 mg.L-1 (n= 2), respectively. The concentrations that caused adverse effects on the success of eggs hatching were higher or close to the EC50 immobility, demonstrating that this is not the most sensitive endpoint as expected. Tests performed after photoelectrochemical treatment showed that the toxicity of both tests was reduced. This treatment shows promise for the treatment of these compounds, however, it is worth noting that the use of salt for treatment is interfering and cause toxicity when discarded or disposed of in freshwater environments (AU)

• FAPESP's process: 10/14033-0 - Evaluation of the toxicity of dyes with a marine organism - Nitocra sp.
• Grantee: Mariana Coletty Artal
• Support Opportunities: Scholarships in Brazil - Master