Analysis of reactive dyes using high performance capillary electrophoresis

Hansa, A.; Pillay, V. L.; Buckley, Chris

doi:10.2166/wst.1999.0649

Cited by 9 publications

(8 citation statements)

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“…For example, significant amounts of synthetic textile dyes that are highly water-soluble are lost into wastestreams during the manufacturing of dyestuff and other textile processing operations. 5 Since most of these dyes have high water solubility, they are generally difficult to remove by the usual waste-treatment systems. Efficient, rapid, cost-effective, and environmentally-friendly removal of dyestuff from aqueous media has always been a major issue.…”

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confidence: 99%

Efficient Precipitation of Dyes from Dilute Aqueous Solutions of Ionic Liquids

et al. 2006

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Due to their unusual properties, ionic liquids are garnering increased attention from academic and industrial research communities alike. 1 Almost every named synthesis and many more organic/inorganic/organometallic reactions have been reported in ionic liquids. 2 Novel analytical applications of ionic liquids are emerging every day; effective, and in some cases unique, utilizations of ionic liquids have been demonstrated in a variety of techniques encompassing electroanalysis, separation, extraction, spectrometry, and sensing. 1 More specifically, unique features have emerged during many investigations of extraction processes involving ionic liquids. 1,3 Some of the initial reports on the utilization of ionic liquids in extraction started to appear in the mid-to-late 1990's. 4 These reports hint towards an unexplored potential of ionic liquids in extractionbased applications.Optical dyestuff has diverse industrial applications. Unfortunately, as a consequence, they are often present in wastewater and give rise to potential hazards due to their inherent toxicity. For example, significant amounts of synthetic textile dyes that are highly water-soluble are lost into wastestreams during the manufacturing of dyestuff and other textile processing operations. 5 Since most of these dyes have high water solubility, they are generally difficult to remove by the usual waste-treatment systems. Efficient, rapid, cost-effective, and environmentally-friendly removal of dyestuff from aqueous media has always been a major issue.In this paper, we present an efficient, rapid, and remarkablyeasy way of efficiently extracting cationic dyes from their aqueous solutions using popular ionic liquids. We have demonstrated that the addition of only ∼1.7 wt% (∼0.06 M) of ionic liquids to the aqueous solutions of six popular cationic dyes resulted in almost complete precipitation of each dye from its aqueous solution. The structures of the six cationic dyes investigated are presented in Fig. 1.Aqueous solutions of the six dyes were prepared at three different concentrations of 75 μM, 750 μM, and 1.5 mM at room temperature using doubly distilled deionized water. The UV-Vis molecular absorption spectra of the dye solutions were obtained. To these dye solutions, ca. 1.7 wt% (0.06 M) ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6) was directly added. The solubility of bmimPF6 in water under ambient conditions is ca. 2.1 wt%. 6Immediate precipitation of dyes was clearly evident in each case, as demonstrated in Fig. 2 for one of the dyes, pinacyanol chloride. As shown in Fig. 2, colored dye solutions became nearly clear upon the addition of bmimPF6. Solid precipitated dyes were carefully removed from the solutions. Extracted solid dyes were dried at room-temperature, after which, the 1 H NMR spectra of the dyes were collected and compared with those of dyes from the stock. The 1 H NMR spectra are found to be identical, thus confirming the identity of the precipitated dyes to be the same. Further characterization of the...

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confidence: 99%

Efficient Precipitation of Dyes from Dilute Aqueous Solutions of Ionic Liquids

et al. 2006

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“…As stated earlier, the main aim of this study was to develop an analytical method with a minimal sample preparation and find a simple analytical method to replace the current analytical methods (Hansa et al 1999). Nine ternary mixtures with variable concentrations of dyes were spiked in different natural water samples.…”

Section: Calibration By Pls-1 and Selection Of The Optimum Number Of mentioning

confidence: 99%

“…In response to concerns regarding the health risks associated with the use of reactive dyes, an increasing numher of analytical methods have heen developed in recent years for their determination. Several reports descrihed the applications of new analytical procedures for the detection and determination of dyes in various matrices such water, wastewater, fish tissue, and animal feed (Hansa et al 1999;Mottaleh & Littlejohn 2001). The spectrophotometric determination of a mixture of dyes is a hard analytical task due to the spectral overlapping hetween dyes (Peralta-Zamora et al 1998) and this prohlem hecomes more complicated for real matrices.…”

Section: Introductionmentioning

confidence: 99%

A simple and accurate analytical method for determination of three commercial dyes in different water systems using partial least squares regression

Al‐Degs

El‐Sheikh

Issa

et al. 2012

Water Science and Technology

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A simple analytical procedure is proposed for simultaneous determination of three common dyes (Basic Blue 9, Brilliant Blue E-4BA, and Reactive Blue 2) in natural waters without prior separation of the solutes. A popular chemometric method, partial least squares regression PLS-1, was effectively applied for spectral resolution of a highly overlapping system. At the best modeling conditions, mean recoveries and relative standard deviations (RSD) for dyes quantification by PLS-1 were found to be 102.1 (4.4), 95.7 (8.4), and 98.9 (6.2) for Basic Blue, Brilliant Blue, and Reactive Blue, respectively. The estimated limits of detection (LOD) were estimated using net-analyte signal concept and were 0.11, 0.52, 0.49 mg L(-1) for Basic Blue, Brilliant Blue, and Reactive Blue, respectively. The quantitative determination of dyes spiked in real water samples was carried out successfully by PLS-1 with satisfactory recoveries for dyes (90-106%).

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“…As a result, the development of new methods for the analysis of dyes and their degradation products is of paramount importance. CE has become an alternative to HPLC for the analysis of dyes such as bis-monochlorotriazinyl sulfonated dyes [130] and sulfonated azo dyes [131]. However, more important is the identification of their degradation products, for which CE-MS is the most reliable technique [27,28,30].…”

Section: Dyesmentioning

confidence: 99%

Recent advances in capillary electrophoresis and capillary electrochromatography of pollutants

2001

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An overview of major developments in capillary electrophoresis and capillary electrochromatography systems in the environmental field is presented, covering relevant publications between the second half of 1999 and early 2001. Contributions are reviewed in relation to developments in detection, sample preparation/preconcentration, precision and applications. Many interesting examples are shown and the influence of important parameters on the performance of developed methods is discussed.

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Analysis of reactive dyes using high performance capillary electrophoresis

Cited by 9 publications

References 0 publications

Efficient Precipitation of Dyes from Dilute Aqueous Solutions of Ionic Liquids

Efficient Precipitation of Dyes from Dilute Aqueous Solutions of Ionic Liquids

A simple and accurate analytical method for determination of three commercial dyes in different water systems using partial least squares regression

Recent advances in capillary electrophoresis and capillary electrochromatography of pollutants

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