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A simple and environmentally friendly sample preparation procedure coupled with gas chromatography-mass spectrometry was developed to assay dimethyl fumarate in textiles and leathers. The sample preparation procedure involved an accelerated solvent extraction (ASE) using water as the extract solvent, followed by the extraction and concentration of dimethyl fumarate from the aqueous solution using vortex-assisted liquid-liquid microextraction (VALLME). The parameters affecting the ASE and VALLME were optimized to achieve the maximum extraction efficiency, and the performance of the developed method was evaluated. Good linearity was observed over the range assayed (0.01-1 mg/kg) with a regression coefficient of 0.998. The limit of detection and enrichment factor for the VALLME step were 0.001 mg/kg and 53, respectively. The intra- and inter-day precision were below 8.9%, and the recovery was approximately 84-103%. The as-developed method was successfully applied to textiles and leather samples. © 2013 Elsevier B.V.

Lu Y.,Zhejiang University | Lu Y.,Zhejiang Textile Testing Research Institute | Zhu Y.,Zhejiang University
Journal of Chromatography A | Year: 2013

A method for quantitative determination of chlorobenzenes in textiles is developed, using pressurized hot water extraction (PHWE), vortex-assisted liquid-liquid microextraction (VALLME) and gas chromatography-mass spectrometry (GC-MS). VALLME serves as a trapping step after PHWE. The extraction conditions are investigated, as well as the quantitative features such as linearity, limits of detection (LODs), limits of quantification (LOQs), repeatabilities and reproducibilities between days. LOQs of 0.018-0.032. mg/kg were achieved. The present method provides good repeatabilities (RSD. <. 6.9%) and demonstrates that PHWE-VALLME-GC-MS is a simple, rapid and environmentally friendly method for determination of chlorobenzenes in textiles. © 2013 Elsevier B.V.

Yang L.,Zhejiang University | Yang L.,Zhejiang Textile Testing Research Institute | Yiwei W.,Zhejiang Textile Testing Research Institute | Caiying L.,Zhejiang Textile Testing Research Institute | Yan Z.,Zhejiang University
Journal of Separation Science | Year: 2013

A dispersive liquid-liquid microextraction procedure coupled with GC-MS is described for preconcentration and determination of banned aromatic amines from textile samples. Experimental conditions affecting the microextraction procedure were optimized. A mixture of 30 μL chlorobenzene (extraction solvent) and 800 μL ACN (disperser solvent), 5 min extraction time, and 5 mL aqueous sample volume were chosen for the best extraction efficiency by the proposed procedure. Satisfactory linearity (with correlation coefficients >0.9962) and repeatability (<9.78%) were obtained for all 20 aromatic amines; detection limits attained were much lower than the standardized liquid-liquid method. The proposed method has advantages of being quicker and easier to operate, and lower consumption of organic solvent. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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