Please use this identifier to cite or link to this item: https://doi.org/10.1021/ac4013573
Title: Application of dissolvable layered double hydroxides as sorbent in dispersive solid-phase extraction and extraction by co-precipitation for the determination of aromatic acid anions
Authors: Tang, S.
Lee, H.K. 
Issue Date: 6-Aug-2013
Citation: Tang, S., Lee, H.K. (2013-08-06). Application of dissolvable layered double hydroxides as sorbent in dispersive solid-phase extraction and extraction by co-precipitation for the determination of aromatic acid anions. Analytical Chemistry 85 (15) : 7426-7433. ScholarBank@NUS Repository. https://doi.org/10.1021/ac4013573
Abstract: Three types of magnesium-aluminum layered double hydroxides were synthesized and employed as solid-phase extraction (SPE) sorbents to extract several aromatic acids (protocatechuic acid, mandelic acid, phthalic acid, benzoic acid, and salicylic acid) from aqueous samples. An interesting feature of these sorbents is that they dissolve when the pH of the solution is lower than 4. Thus, the analyte elution step, as needed in conventional sorbent-based extraction, was obviated by dissolving the sorbent in acid after extraction and separation from the sample solution. The extract was then directly injected into a high-performance liquid chromatography-ultraviolet detection system for analysis. In the key adsorption process, both dispersive SPE and co-precipitation extraction with the sorbents were conducted and experimental parameters such as pH, temperature, and extraction time were optimized. The results showed that both extraction methods provided low limits of detection (0.03-1.47 μg/L) and good linearity (r2 > 0.9903). The optimized extraction conditions were applied to human urine and sports drink samples. This new and interesting extraction approach was demonstrated to be a fast and efficient procedure for the extraction of organic anions from aqueous samples. © 2013 American Chemical Society.
Source Title: Analytical Chemistry
URI: http://scholarbank.nus.edu.sg/handle/10635/93126
ISSN: 00032700
DOI: 10.1021/ac4013573
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