Three types of magnesium−aluminum layered
double hydroxides were synthesized and employed as solidphase 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 (r
2
> 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.
Three types of magnesium−aluminum layered
double hydroxides were synthesized and employed as solidphase 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 (r
2
> 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.
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