Advanced Materials Research Chair, Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
Molecules. 2020 Oct 19;25(20):4794. doi: 10.3390/molecules25204794.
Microextraction procedures for the separation of Pb(II) from water and food samples extracts were developed. A deep eutectic solvent composed of α-benzoin oxime and iron(III) chloride dissolved in phenol was applied as a phase separator support. In addition, this deep eutectic mixture worked as an efficient extractor of Pb(II). The developed microextraction process showed a high ability to tolerate the common coexisting ions in the real samples. The optimum conditions for quantitative recoveries of Pb(II) from aqueous extracts were at pH 2.0, conducted by adding 150 µL from the deep eutectic solvent. The quantitative recoveries were obtained with various initial sample volumes up to 30 mL. Limits of detection and limits of quantification of 0.008 and 0.025 µg L were achieved with a relative standard deviation (RSD%) of 2.9, which indicates the accuracy and sensitivity of the developed procedure. Recoveries from the reference materials, including TMDA 64.2, TMDA 53.3, and NCSDC-73349, were 100%, 97%, and 102%, respectively. Real samples, such as tap, lake, and river water, as well as food samples, including salted peanuts, chickpeas, roasted yellow corn, pistachios, and almonds, were successfully applied for Pb(II) analysis by atomic absorption spectroscopy (AAS) after applying the developed deep eutectic solvent-based microextraction procedures.
开发了用于从水和食物样品提取液中分离 Pb(II) 的微萃取程序。一种由 α-苯偶姻肟和三氯化铁溶解在苯酚中组成的深共晶溶剂被用作相分离支持物。此外，这种深共晶混合物是 Pb(II) 的有效萃取剂。所开发的微萃取工艺显示出高度耐受实际样品中常见共存离子的能力。从水溶液中定量回收 Pb(II) 的最佳条件为 pH 2.0，通过加入 150µL 深共晶溶剂。通过添加各种初始样品体积（最高可达 30 mL），可实现定量回收。检测限和定量限分别为 0.008 和 0.025 µg L，相对标准偏差（RSD%）为 2.9，这表明了所开发程序的准确性和灵敏度。从参考材料中回收的 TMDA 64.2、TMDA 53.3 和 NCSDC-73349 的回收率分别为 100%、97%和 102%。通过原子吸收光谱法（AAS）对实际样品（如自来水、湖水和河水）以及食物样品（如咸花生、鹰嘴豆、烤黄玉米、开心果和杏仁）进行了 Pb(II) 分析，应用所开发的基于深共晶溶剂的微萃取程序后，成功地进行了应用。
