Hacettepe University, Chemistry Department, 06800, Beytepe, Ankara, Turkey.
Hacettepe University, Chemistry Department, 06800, Beytepe, Ankara, Turkey.
Food Chem. 2019 Jun 30;284:16-22. doi: 10.1016/j.foodchem.2019.01.092. Epub 2019 Jan 19.
In the proposed work an ultrasound assisted ion pair based surfactant-enhanced dispersive liquid-liquid microextraction (UA-IPSE-DLLME) with solidification of floating organic drop was studied for preconcentration and flame atomic absorption spectrometry (FAAS) determination of nickel and cobalt ions in vegetable and herb samples. Congo Red (CR) and didecyldimethyl ammonium chloride (DDMAC) were used as complexing and ion-pairing agents, respectively. By using ion-pairing agent CR-metal complexes gained more hydrophobic character and extracted into 1-dodecanol more efficiently. Some parameters affect extraction efficiency were studied and some analytical characteristics of the method were calculated. Under optimized conditions, detection limit of 1.7 μg L and 2.4 μg L, quantification limit of 5.6 μg L and 7.9 μg L and enrichment factors of 65 and 48 were obtained for nickel and cobalt, respectively. Relative standard deviation (n = 7) for 100 μg L nickel and cobalt were 3.6% and 3.8%, respectively. The proposed UA-IPSE-DLLME method has been successfully applied for the determination of nickel and cobalt ions in certified reference materials and some food samples.
在本研究工作中，提出了一种基于超声辅助离子对的表面活性剂增强分散液液微萃取（UA-IPSE-DLLME）方法，其中包括固-浮有机液滴的固化，用于蔬菜和草药样品中镍和钴离子的预浓缩和火焰原子吸收光谱（FAAS）测定。刚果红（CR）和双十烷基二甲基氯化铵（DDMAC）分别用作络合剂和离子对试剂。通过使用离子对试剂 CR-金属配合物，它们获得了更多的疏水性，并更有效地萃取到 1-十二醇中。研究了影响萃取效率的一些参数，并计算了该方法的一些分析特性。在优化条件下，镍和钴的检测限分别为 1.7μg/L 和 2.4μg/L，定量限分别为 5.6μg/L 和 7.9μg/L，富集因子分别为 65 和 48。对于 100μg/L 的镍和钴，相对标准偏差（n=7）分别为 3.6%和 3.8%。该提出的 UA-IPSE-DLLME 方法已成功应用于测定认证参考材料和一些食品样品中的镍和钴离子。
