A Critical Comparison of Methods for the Analysis of Indigo in Dyeing Liquors and Effluents.
A Critical Comparison of Methods for the Analysis of Indigo in Dyeing Liquors and Effluents.
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DOI：
10.3390/ma7096184
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发表时间：
2014-08-29
期刊：
影响因子：
--
通讯作者：
Gutiérrez-Bouzán C
中科院分区：
文献类型：
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作者：
Buscio V;Crespi M;Gutiérrez-Bouzán C
靛蓝是纺织工业中最重要的染料之一。控制染色液和废水中的靛蓝浓度是确保染色织物的再现性以及建立废水处理效率的重要工具。本文对靛蓝染料的三种分析方法进行了研究和验证，旨在选择一种可靠、快速、自动化的靛蓝染料测定方法。第一种方法是基于染料的提取，用氯仿，在其氧化形式。通过紫外（UV）-可见分光光度法在604 nm处测量有机溶液。第二种方法通过紫外-可见分光光度法在407 nm处测定靛蓝在水性介质中的无色形式的浓度。最后，在最后一种方法中，靛蓝的浓度通过用六氰合铁酸钾（K3（Fe（CN）6））的氧化还原滴定来确定。结果表明，我们研究的三种方法均符合准确度和精密度的既定验收标准。然而，第三种方法被认为是最适合工业规模应用的方法，因为它的工作范围更宽，比其他方法具有显著的优势。
Indigo is one of the most important dyes in the textile industry. 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. 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 first method is based on the extraction of the dye, with chloroform, in its oxidized form. The organic solution is measured by Ultraviolet (UV)-visible spectrophotometry at 604 nm. The second method determines the concentration of indigo in its leuco form in aqueous medium by UV-visible spectrophotometry at 407 nm. Finally, in the last method, the concentration of indigo is determined by redox titration with potassium hexacyanoferrate (K3(Fe(CN)6)). The results indicated that the three methods that we studied met the established acceptance criteria regarding accuracy and precision. 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.