These dyes common present on archaeological textile objects to be used as standard dyed textile samples. In this study wool textile samples were dyed with 10 natural dyes such as cochineal, cutch, henna, indigo, Lac, madder, safflower, saffron, sumac and turmeric. This study aims to evaluate the use of Laser Fluorescent as a non-destructive technique for identification of natural dyes on archaeological textile objects. The results obtained with this study can be a guide for all conservators in identification of natural organic dyes on archaeological textile objects.« less This study confirms that Laser Florescent is very useful and a rapid technique can be used as a non-destructive technique for identification of natural dyes on archaeological textile objects. The dyed textile samples were investigated with laser radiation in different wavelengths to detect themore » best wavelengths for identification each dye. These selected natural dyes will be used as known references that can be used a guide to identify unknown archaeological dyes. Identification Of Natural Dyes On Archaeological Textile Objects Using Laser Induced Fluorescent TechniqueĭOE Office of Scientific and Technical Information (OSTI.GOV)Ībdel-Kareem, O. However, the third method was considered the most adequate for application on an industrial scale due to its wider work range, which provides a significant advantage over the others. The results indicated that the three methods that we studied met the established acceptance criteria regarding accuracy and precision. Finally, in the last method, the concentration of indigo is determined by redox titration with potassium hexacyanoferrate (K3(Fe(CN)6)). The second method determines the concentration of indigo in its leuco form in aqueous medium by UV-visible spectrophotometry at 407 nm. The organic solution is measured by Ultraviolet (UV)-visible spectrophotometry at 604 nm. The first method is based on the extraction of the dye, with chloroform, in its oxidized form. In this work, three analytical methods were studied and validated with the aim to select a reliable, fast and automated method for the indigo dye determination. The control of the indigo concentration in dyeing liquors and effluents is an important tool to ensure the reproducibility of the dyed fabrics and also to establish the efficiency of the wastewater treatment. Indigo is one of the most important dyes in the textile industry. All rights reserved.Ī Critical Comparison of Methods for the Analysis of Indigo in Dyeing Liquors and Effluentsīuscio, Valentina Crespi, Martà Gutiérrez-Bouzán, Carmen Copyright © 2016 Sociedade Brasileira de Microbiologia. The cyanobacteria showed the ability to degrade the dyes present in a textile effluent therefore, they can be used in a tertiary treatment of effluents with recalcitrant compounds. Two metabolites were produced during the degradation, anthranilic acid and isatin, but toxicity did not increase after the treatment. No mutagenicity was observed after the treatment. An evaluation of the mutagenicity potential was performed by use of the micronucleus assay using Allium sp. autumnale UTEX1580 was the only strain that completely degraded the indigo dye. However, the growth of cyanobacteria on sludge was slow and discoloration was not efficient. The three cyanobacteria showed the potential to remediate textile effluent by removing the colour and reducing the toxicity. Toxicity was measured using the organisms Hydra attenuata, the alga Selenastrum capricornutum and lettuce seeds. The discoloration was evaluated by absorption spectroscopy. The dye degradation efficiency of the cyanobacteria was compared with anaerobic and anaerobic-aerobic systems in terms of discolouration and toxicity evaluations. The degradation of three textile dyes ( Indigo, RBBR and Sulphur Black), and the dye-containing liquid effluent and solid waste from the Municipal Treatment Station, Americana, São Paulo, Brazil, by the cyanobacteria Anabaena flos-aquae UTCC64, Phormidium autumnale UTEX1580 and Synechococcus sp. Degradation of textile dyes by cyanobacteria.ĭellamatrice, Priscila Maria Silva-Stenico, Maria Estela Moraes, Luiz Alberto Beraldo de Fiore, Marli Fátima Monteiro, Regina Teresa Rosimĭyes are recalcitrant compounds that resist conventional biological treatments.
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