Azo dyes and carcinogenic aromatic amines in cell cultures

Hildenbrand, Sibylle; Schmahl, F. W.; Wodarz, Roman; Kimmel, R.; Dartsch, Peter C.

doi:10.1007/pl00014217

Cited by 74 publications

(39 citation statements)

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“…A major class of all colorants used worldwide is represented by azo dyes -substituted aromatic moieties linked by azo groups (2 N ¼ N 2). The presence of such compounds in the industrial wastewater may create serious environmental problems due to toxicity for aquatic life and mutagenecity to humans (Hildenbrand et al, 1999). In spite of persistence to biodegradation under aerobic conditions (Pearce et al, 2003;Yemashova and Kalyuzhnyi, 2005), azo dyes undergo reductive splitting of the azo bond relatively easily under anaerobic conditions (Kalyuzhnyi and Sklyar, 2000;Pearce et al, 2003;Yemashova et al, 2004) releasing corresponding aromatic amines.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of anaerobic biodecolourisation of azo dyes

Kalyuzhnyi

Yemashova

Fedorovich

2006

Water Science and Technology

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Kinetics of anaerobic biodecolourisation (methanogenic environment) of four azo dyes (Acid Orange 6, Acid Orange 7, Methyl Orange and Methyl Red) was investigated with regard to their electrochemical properties as well as under variation of dye and sludge concentrations, pH and temperature. Cyclic voltammetry revealed a correlation between the potential of irreversible reduction peak of the dye and its first-order decolorisation constant. For each dye tested, this decolourisation constant was adversely proportional to dye concentration (0.086 -1.7 mM) and had a saturation (hyperbolic) dependency on sludge concentration (0.04 -1.1 g VSS/l), a bell-shape dependency on pH (4.0-9.0) and Arrhenius dependency on temperature (24 -40 8C). Transfer from methanogenic to sulphate reducing environment led to an increase of decolorisation constant for all the dyes investigated due to the abundant presence of sulphide as a reducing agent in the reaction medium. Similar transfer to a denitrifying environment resulted in an almost complete decease of decolourisation because nitrate easily outcompetes azo dyes as an electron acceptor.

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Section: Introductionmentioning

confidence: 99%

Kinetics of anaerobic biodecolourisation of azo dyes

Kalyuzhnyi

Yemashova

Fedorovich

2006

Water Science and Technology

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“…When it was found that some of these dyes can be degraded by bacteria and enzymes [1,2] to form mutagenic and carcinogenic aromatic amines [3,4], the European Parliament reacted by introducing a ban on azo dyes, in textile and leather articles, which after reductive cleavage of their azo groups will form any of the 22 listed harmful aromatic amines [5]. This has led to an increasing demand for a quantitative analytical procedure for the determination of banned azo dyes in leather.…”

Section: Introductionmentioning

confidence: 98%

Standard addition – A way of improving quantification of banned azo dyes in leather

Ahlström

Amon

Mathiasson

2005

J of Separation Science

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An analytical procedure based on supercritical-fluid extraction and microwave-assisted extraction was applied on six different real leather samples for the determination of banned azo dyes. Determination of the dyes was performed indirectly by measuring their corresponding harmful aromatic amines, formed after reduction. A comparative study between external standard calibration and standard addition using both the dyes as well as the corresponding amines showed that the latter quantification method provided the highest accuracy.

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“…Dyes with striking visibility in recipients may significantly affect photosynthetic activity in aquatic environment due to the reduced light penetration (Fu and Virarahavan 2001). It is estimated that over 10% of dye used in textile processing does not bind to the fibers and is, therefore, released to the environment (Hildenbrand et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Gamma irradiation and steam pretreatment of jute stick powder for the enhancement of dye adsorption efficiency

et al. 2017

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The aim of this study is to find out the facile and effective pretreatment technique to enhance the capacity of jute stick powder (JSP) in adsorbing dye from raw textile effluent. Hence, different pretreatment techniques, i.e., radiation treatment, alkali treatment, ammonia treatment, steam treatment and CaCl 2 treatment were applied to JSP and the adsorbing performance were examined for synthetic dye solutions (Blue FCL and Red RL dye). Different gamma radiation doses were applied on JSP and optimum dye removal efficiency was found at 500 krad in removing these two dyes (50 ppm) from solutions. Among the different pretreatment techniques, gamma irradiated JSP (500 Krad) exhibits highest dye uptake capacity for RED RL dye, whereas steam-treated JSP shows highest performance in adsorbing blue FCL dye. Subsequently, we applied the gamma irradiated and steam-treated JSP on real textile effluent (RTE) and these two techniques shows potentiality in adsorbing dye from raw textile effluent and in reducing BOD 5 , COD load and TOC to some extent as well. Fourier transform infrared spectroscopy (FTIR) analysis also proved that dye has been adsorbed on pretreated JSP.

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Azo dyes and carcinogenic aromatic amines in cell cultures

Cited by 74 publications

References 0 publications

Kinetics of anaerobic biodecolourisation of azo dyes

Kinetics of anaerobic biodecolourisation of azo dyes

Standard addition – A way of improving quantification of banned azo dyes in leather

Gamma irradiation and steam pretreatment of jute stick powder for the enhancement of dye adsorption efficiency

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