Department of Analytical Chemistry, Faculty of Chemistry, K.N. Toosi University of Technology, Tehran, Iran.
Department of Analytical Chemistry, Faculty of Chemistry, K.N. Toosi University of Technology, Tehran, Iran.
Food Chem. 2018 May 30;249:30-37. doi: 10.1016/j.foodchem.2017.12.085. Epub 2017 Dec 27.
Determination of heavy metals at trace levels has a great deal of importance due to their undesirable effects on human life. In this study, N,N'-bis (acetyl acetone) ethylenediimine (FeO@SiO-EDN) was synthesized and applied for dispersive solid phase extraction of copper in water and cereal samples followed by FAAS. Sorbent characterization was investigated by SEM, FT-IR, EDX and VSM. The effective parameters were optimized using a central composite design. Under the optimal conditions, LOD (S/N = 3) and LOQ, preconcentration factor and RSD% were found to be 1.5 ng mL, 4.0 ng mL, 13 and 2.3%, respectively. The calibration curve was linear within the range of 4.0-175 ng mL with r > 0.998. Relative recoveries were achieved within the range of 90.0-95.0%. With thanks of the good resulting analytical performance in this work, the proposed method can be applied as a suitable alternative for trace analysis of copper.
由于重金属对人类生活的不良影响，痕量重金属的测定具有重要意义。在本研究中，合成了 N，N'-双（乙酰丙酮）乙二胺（FeO@SiO-EDN），并将其用于水和谷物样品中铜的分散固相萃取，随后用 FAAS 进行测定。通过 SEM、FT-IR、EDX 和 VSM 对吸附剂进行了表征。采用中心组合设计优化了有效参数。在最佳条件下，LOD（S/N=3）和 LOQ、富集因子和 RSD%分别为 1.5ng/mL、4.0ng/mL、13 和 2.3%。校准曲线在 4.0-175ng/mL 范围内呈线性，r>0.998。相对回收率在 90.0-95.0%范围内。由于本工作中分析性能良好，该方法可作为痕量分析铜的一种合适替代方法。
