Faculty of Chemistry, Shahid Beheshti University, Tehran, Iran.
Anal Chim Acta. 2013 Jun 14;783:74-9. doi: 10.1016/j.aca.2013.04.045. Epub 2013 May 2.
A novel method for the selective electromembrane extraction (EME) of U(6+) prior to fluorometric determination has been proposed. The effect of extraction conditions including supported liquid membrane (SLM) composition, extraction time and extraction voltage were investigated. An SLM composition of 1% di-2-ethyl hexyl phosphonic acid in nitrophenyl octyl ether (NPOE) showed good selectivity, recovery and enrichment factor. The best performance was achieved at an extraction potential of 80 volts and an extraction time of 14 minutes Under the optimized conditions, a linear range from 1 to 1000 ng mL(-1) and LOD of 0.1 ng mL(-1) were obtained for the determination of U(6+). The EME method showed good performance in sample cleanup and the reduction of the interfering effects of Mn(2+), Zn(2+), Cd(2+), Ni(2+), Fe(3+), Co(2+), Cu(2+), Cl(-) and PO4(3-) ions during fluorometric determination of uranium in real water samples. The recoveries above 54% and enrichment factors above 64.7 were obtained by the proposed method for real sample analysis.
一种新的选择性电膜萃取（EME）方法已被提出，用于在荧光测定之前选择性萃取 U(6+)。考察了萃取条件的影响，包括支撑液膜（SLM）组成、萃取时间和萃取电压。在 1%的二-2-乙基己基膦酸在硝基苯辛基醚（NPOE）中的 SLM 组成表现出良好的选择性、回收率和富集因子。在最佳萃取条件下，U(6+)的测定线性范围为 1 至 1000ng mL(-1)，LOD 为 0.1ng mL(-1)。该 EME 方法在样品净化和减少 Mn(2+)、Zn(2+)、Cd(2+)、Ni(2+)、Fe(3+)、Co(2+)、Cu(2+)、Cl(-)和 PO4(3-)离子在实际水样中荧光测定铀时的干扰方面表现出良好的性能。通过该方法对实际样品进行分析，回收率高于 54%，富集因子高于 64.7。
