Determinación de la bencidina en los rios que reciben la carga de efluentes de las industrias textiles de la ciudad de São Carlos / Determinação de benzidina nos rios que recebem a carga de efluentes das industrias têxteis da cidade de São Carlos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

It is estimated that approximately 12% of synthetic textile dyes are lost between production and use, which makes the evaluation of the environmental impact of the textile industry difficult. Benzidine is a recognized carcinogen and mutagen, which can be found in a wide variety of dyes listed in the Color Index. A number of countries have banned the use of benzidines. This is true for USA (1973), which only permits production of benzidine for a companys own consumption. However, countries like Brazil do not have such an efficient control over the production and use of benzidine-based dyes, which can even be found in pediatric medicines. In this study, the presence of benzidines in the Tijuco Preto and Gregório streams (São Carlos city) was verified. These waterways were chosen due to the fact that two textile industries discharge their wastewater into these watercourses. In this study the liquid-liquid extraction method at pH 5 was employed for sample preparation and gas chromatography coupled with a mass spectrometer (GC-MS) was used to detect and quantify benzidines in the collected water samples. The presence of benzidines was verified in both the Tijuco Preto and Gregório streams at concentrations of 0.0006 and 0.0007 mg L-1, respectively.

ASSUNTO(S)

salting-out salting-out benzidina bencidina cg-em efs ell efs ell cg-em

ACESSO AO ARTIGO

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