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WOS: 000378451600022, A solid-phase extraction method, based on the adsorption onto Diaion HP-20 resin, was developed for simultaneous spectrophotometric determination of Lanaset Blue 2R and Lanaset Yellow 28 dyes which are most together hazardous textile dyes in wastewater. Concentrations of the dyes were determined using UV-visible spectrophotometer at 625 and 438 nm for LB-2R and LY-28, respectively. The developed method was also applied to water samples. In dying process water, 572 +/- 15 mu g/mL and 396 +/- 6 mu g/mL of LB-2R and LY-28 dyes were determined. In addition, adsorption isotherms of the method, point of zero charge and surface micrographs of the resin were investigated. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

The two novel preconcentration and separation methods based on adsorption onto Amberlite XAD-1180 and Amberlite XAD-16 polymeric resins for spectrophotometric determination of sunset yellow dye were developed. The parameters, affecting the quantitative recovery, including pH, sample and eluent flow rates, eluent type, sample volume, were investigated and optimised. The interference effects of some cations, anions and widely used dye were also studied. At the optimum conditions, detection limits of the methods were found as 2.0 and 1.6 µg L-1 for Amberlite XAD-1180 and Amberlite XAD-16 resins, respectively. Linear dynamic ranges of the methods were obtained in the range of 0.2-50.0 and 0.2-20.0 µg mL-1 for Amberlite XAD-1180 and Amberlite XAD-16 resins, respectively. The relative standard deviations were below than 7% and 5% for Amberlite XAD-1180 and Amberlite XAD-16 resins, respectively. The determination of dye was performed at 483.0 nm using spectrophotometry. Validations of the methods were performed comparatively with determination of the sunset yellow content of some foodstuffs and pharmaceuticals. The two novel preconcentration and separation methods based on adsorption onto Amberlite XAD-1180 and Amberlite XAD-16 polymeric resins for spectrophotometric determination of sunset yellow dye were developed. The parameters, affecting the quantitative recovery, including pH, sample and eluent flow rates, eluent type, sample volume, were investigated and optimised. The interference effects of some cations, anions and widely used dye were also studied. At the optimum conditions, detection limits of the methods were found as 2.0 and 1.6 µg L-1 for Amberlite XAD-1180 and Amberlite XAD-16 resins, respectively. Linear dynamic ranges of the methods were obtained in the range of 0.2-50.0 and 0.2-20.0 µg mL-1 for Amberlite XAD-1180 and Amberlite XAD-16 resins, respectively. The relative standard deviations were below than 7% and 5% for Amberlite XAD-1180 and Amberlite XAD-16 resins, respectively. The determination of dye was performed at 483.0 nm using spectrophotometry. Validations of the methods were performed comparatively with determination of the sunset yellow content of some foodstuffs and pharmaceuticals. © 2015 Institute of Food Science and Technology.

WOS: 000358540400028, Separation, preconcentration, and spectrophotometric determination of tartrazine (E 102) was performed by solid-phase extraction methods with using spectrophotometry. For this purpose, Amberlite XAD-1180 and Amberlite XAD-16 resins and mini-chromatographic column were used. All absorbance measurements of the dye were determined at 427 nm. Analytical parameters including pH, sample and eluent flow rates, eluent type, ionic strength, sample volume, and adsorption isotherms were investigated and optimized. Under optimum condition interference effect of main cations, some anions and widely used dyes were examined. Detection limits of the proposed methods were determined as 5.7 and 1.2 mu g L-1 for XAD-1180 and XAD-16 resins, respectively. Linear dynamic ranges of the methods were found between 0.4-30 and 0.4-12 mu g mL(-1) of tartrazine for XAD-1180 and XAD-16 resins, respectively. The preconcentration factors were found as 60 and 80 for XAD-1180 and XAD-16 columns, respectively. Relative standard deviations were lower than 7 % throughout all experiments for two methods. Developed methods were validated and checked with determination of tartrazine levels in soft drink samples by addition of analyte. The comparisons of the methods were performed by the analysis of tartrazine contents of food samples. Tartrazine concentrations, investigated solid samples, ranged between 146 and 391 mu g/g. Tartrazine content of liquid sample was found as 7.4 and 7.3 mu g/mL for X1180 and X16 methods, respectively. The results suggest that the methods are suitable for the determination of tartrazine. Very accurate results were obtained for spiked values of the tartrazine into the food samples. In addition to accuracy, the method is simple, environmental friendly, and economical for the determination of tartrazine level in food samples. In addition of analytical parameters, adsorption and isotherm studies were performed for two kinds of Amberlite resins. It was observed that the methods fitted the linear form of Freundlich isotherm model.

Amberlite XAD-7 and XAD-8 resins were used as adsorbents for preconcentration and determination of Allura Red (AR) food dye in aqueous medium. The effects of pH, sample volume, sample and eluent flow rates on the extraction of AR were optimised. The determination of dye was performed at 506.0 nm using spectrophotometry. Interference effects of matrix ions and some dyes were also investigated under optimised conditions. The methods permitted low detection limits which were 1.2 and 0.6 µg L-1 for XAD-7 and XAD-8, respectively. Adsorption behaviours were investigated by adsorption isotherms and zero charge pH experiments. Validations of the method were performed by determination of AR contents in some foodstuffs. AR contents of liquid samples were found between 58 and 440 µg mL-1. AR concentrations of solid samples were between 416 and 432 µg g-1. The XAD-7 and XAD-8 resins presented a fast and reliable potential to determine AR dye in real samples. © 2016 Institute of Food Science and Technology