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Title: Centrifuge-free dispersive liquid-liquid microextraction coupled with thin-film microextraction for the preconcentration of molinate in real samples by ion mobility spectrometry
Journal: Talanta
Author: 1. Maliheh Heidarbeigi, Mohammad T. Jafari, Mohammad Saraji
Year: 2021
Address: Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran
Abstract: A tandem microextraction method, centrifuge free dispersive liquid-liquid microextraction and thin-film microextraction (DLLME-TFME), was used for analyzing molinate in environmental samples by ion mobility spectrometry (IMS). Considering the IMS as a competitive detection system, coupling these two popular sample preparation methods reduces the effect of solvent interference and improves the sensitivity of the technique. Trichloromethane and methanol were used as the extraction, and dispersive solvents for the DLLME method and electrospun polyacrylonitrile/copper-benzene-1,4-dicarboxylic acid fibers were used as a sorbent in the TFME method. Some effective experimental variables influencing the extraction efficiency of an analyte such as type and volume of dispersive and extraction solvents, solution pH, ionic strength, sonication time, and extraction time were studied. The linear dynamic range of 0.5–50 μg L􀀀 1 and the limit of detection of 0.1 μg L􀀀 1 were obtained under optimized conditions. The relative standard deviations for intra-and inter-day analysis were calculated less than 10%. The present method was used for the determination of molinate in different real samples such as agricultural wastewater, well water, river water, and apple, and the recovery was obtained between 82% and 113%, for the spiked samples.
Keywords: Dispersive liquid-Liquid microextraction, Thin-film microextraction, Ion mobility spectrometry, Molinate, Copper-benzene-1,4-dicarboxylic acid
Application: Extraction
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URL: #https://www.sciencedirect.com/science/article/abs/pii/S0039914020313187#