Department of Chemistry, College of Science, Shiraz University, 71454 Shiraz, Iran.
J Hazard Mater. 2011 Mar 15;187(1-3):75-81. doi: 10.1016/j.jhazmat.2010.12.053. Epub 2011 Jan 4.
A simple and selective method was used for the preconcentration and determination of uranium(VI) by solid-phase extraction (SPE). In this method, a column of alumina modified with sodium dodecyl sulfate (SDS) and a new Schiff's base ligand was prepared for the preconcentration of trace uranyl(VI) from water samples. The uranium(VI) was completely eluted with HCl 2M and determined by a spectrophotometeric method with Arsenazo(III). The preconcentration steps were studied with regard to experimental parameters such as amount of extractant, type, volume and concentration of eluent, pH, flow rate of sample source and tolerance limit of diverse ions on the recovery of uranyl ion. A preconcentration factor more than 200 was achieved and the average recovery of uranyl(VI) was 99.5%. The relative standard deviation was 1.1% for 10 replicate determinations of uranyl(VI) ion in a solution with a concentration of 5 μg mL(-1). This method was successfully used for the determination of spiked uranium in natural water samples.
本文采用固相萃取（SPE）技术，建立了一种简单、选择性好的铀（VI）的预富集和测定方法。该方法用十二烷基硫酸钠（SDS）改性的氧化铝作为SPE 小柱，以一种新的希夫碱配体作为螯合剂，从水样中预富集痕量铀酰离子。用 2M HCl 将铀（VI）完全洗脱下来，并用分光光度法结合偶氮胂 III 进行测定。考察了萃取剂用量、洗脱剂种类、体积及浓度、pH 值、进样流速以及共存离子对铀酰离子洗脱率的影响。该方法的预富集倍数大于 200，铀酰离子的平均回收率为 99.5%。在 5μg mL(-1)铀酰离子浓度下，10 次平行测定的相对标准偏差为 1.1%。该方法成功地用于天然水样中铀的加标测定。
