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MUTAGENIC COMPOUNDS GENERATED FROM THE CHLORINATION OF DISPERSE AZO-DYES AND THEIR PRESENCE IN DRINKING WATER
Citation:
OLIVERA, D. P., P. A. CANNEIRO, C. M. RECH, M. Y. ZANONI, L. D. CLAXTON, AND G. UMBUZEIRO. MUTAGENIC COMPOUNDS GENERATED FROM THE CHLORINATION OF DISPERSE AZO-DYES AND THEIR PRESENCE IN DRINKING WATER. ENVIRONMENTAL SCIENCE AND TECHNOLOGY. American Chemical Society, Washington, DC, 40(21):6682-6689, (2006).
Impact/Purpose:
This study identifies a new class of DBPs (nitrated benzotriazoles) generated by chlorine disinfection of an azo dye mixture
Description:
Although the disinfection of water for human usage is necessary, the formation of toxic disinfection by-products (DBPs) does occur. Recent discovery of a novel class of mutagenic DBPs, PBTA (2-phenylbenzotriazole) derivatives, demonstrates that textile effluents have the potential to contaminate surface waters and treated drinking waters. This study identifies a new but related class of DBPs (nitrated benzotriazoles) that is generated by chlorine disinfection of an azo dye mixture that is used in Brazil. A chlorination process was used to decolorize and produce products from a Black Dye Commercial Product (BDCP) (a mixture of C.I. Disperse Blue 373, C.I. Disperse Violet 93 and C.I. Disperse Orange 37) that were then tested in the Salmonella mutagenicity assay. HPLC chromatograms showed that the original dyes were not found in the chlorinated solutions. The chlorinated solution, however, was mutagenic. Using TLC, we showed that the BDCP components were in surface waters and the water intake at a drinking water treatment plant, but these dyes were not found in the drinking water. However, mutagenicity of the drinking water gave results like those of the chlorinated products.