采用新合成的螯合剂在分散液液微萃取中优化测定水样中铁浓度的方法。
Optimization of a methodology for determination of iron concentration in aqueous samples using a newly synthesized chelating agent in dispersive liquid-liquid microextraction.
机构信息
Department of Chemistry, Faculty of Science, University of Guilan, Rasht 41335-1914, Iran; Department of Medicinal Chemistry, Faculty of Pharmacy, Isfahan University of Medical Sciences, 81746-73461 Isfahan, Iran.
Department of Chemistry, Faculty of Science, University of Guilan, Rasht 41335-1914, Iran.
出版信息
Food Chem. 2018 Oct 30;264:9-15. doi: 10.1016/j.foodchem.2018.04.135. Epub 2018 May 5.
The aim of this study was to establish a new dispersive liquid-liquid microextraction (DLLME) technique for the determination of iron concentration in aqueous solutions and fruit juices based on the reaction between iron and 3-hydroxy-1-(3-hydroxyphenyl)-2-methylpyridin-4(1H)-one (3-OH-PMPO) as a chelating agent. A central composite design (CCD) was applied to optimize the effects of independent parameters (pH, volume of disperser solvent and extractant solvent and chelating agent concentration) on extraction efficiency. Under the optimized conditions, the analytical curve is linear in a concentration range of 10-750 μgL with a detection limit of 5 μgL. The relative standard deviation (RSD) for ten repeated determinations of iron concentrations at 40 and 200 μgL was calculated to be 4.2% and 1.2%, respectively. Relative recovery of iron in several water samples was investigated and the average was obtained in the range of 91-108%.
本研究旨在建立一种新的分散液液微萃取（DLLME）技术，用于基于铁与 3-羟基-1-(3-羟基苯基)-2-甲基吡啶-4(1H)-酮（3-OH-PMPO）作为螯合剂之间的反应，测定水溶液和果汁中的铁浓度。采用中心组合设计（CCD）优化了独立参数（pH、分散溶剂和萃取溶剂的体积以及螯合剂浓度）对萃取效率的影响。在优化条件下，分析曲线在 10-750 μgL 的浓度范围内呈线性，检测限为 5 μgL。在 40 和 200 μgL 的铁浓度下，重复测定 10 次的相对标准偏差（RSD）分别为 4.2%和 1.2%。对几种水样中铁的相对回收率进行了研究，平均回收率在 91-108%范围内。
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