Determination of uranium in water samples by energy-dispersive X-ray fluorescence spectrometry after solid-phase extraction

IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Roberta N. C. S. Carvalho, Taiana A. Anunciação, Alailson F. Dantas, Fabio de S. Dias, Leonardo S. G. Teixeira
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Abstract

An analytical method is presented for determining the uranium concentration in water samples via energy-dispersive X-ray fluorescence (EDXRF) spectrometry after solid-phase extraction. For the preconcentration procedure, the 1-(-2-thiazolylazo)-2-naphthol (TAN) reagent was used to complex the analyte in the samples. After the percolation of the sample and retention of the complex on a C18 disk, analysis was performed directly on the solid phase via EDXRF. The pH, sample flow rate, and sample volume were analyzed in terms of the uranium extraction. Using a sample volume of 110.0 mL buffered at pH 6.5 and a flow rate of 1.0 mL min−1, an enrichment factor (EF) of 645 was achieved, with a limit of detection of 1.5 μg L−1. The relative standard deviation (RSD, %), calculated from replications of the experiment under recommended conditions (n = 10; 20 μg L−1), was 10%. The results of the analyte addition and recovery tests varied between 98 and 117%. The accuracy of the method was verified via analysis of a water reference material, with no significant difference between the obtained values and the certified values (95% confidence level). The method was applied to groundwater, river water, and tap water samples collected in Caetité, Bahia, Brazil, and the results were compared with those obtained via inductively coupled plasma‒mass spectrometry (ICP‒MS). All the collected samples presented uranium concentrations below the acceptable maximum limit for drinking water samples.

Abstract Image

固相萃取后利用能量色散 X 射线荧光光谱法确定水样中的铀含量
本文介绍了一种在固相萃取后通过能量色散 X 射线荧光光谱法测定水样中铀浓度的分析方法。在预浓缩过程中,使用 1-(-2-噻唑偶氮)-2-萘酚(TAN)试剂络合样品中的分析物。样品渗滤并在 C18 盘上保留络合物后,直接在固相上通过 EDXRF 进行分析。从铀萃取的角度分析了 pH 值、样品流速和样品量。使用 pH 值为 6.5 的缓冲液和 1.0 mL/min-1 的流速,样品量为 110.0 mL,富集因子 (EF) 为 645,检测限为 1.5 μg L-1。根据推荐条件下的重复实验(n = 10;20 μg L-1)计算得出的相对标准偏差(RSD,%)为 10%。分析物添加和回收率测试的结果介于 98% 和 117% 之间。该方法的准确性通过对水参考物质的分析得到了验证,所得值与认证值之间无明显差异(置信度为 95%)。该方法适用于在巴西巴伊亚州 Caetité收集的地下水、河水和自来水样本,并将结果与电感耦合等离子体质谱法(ICP-MS)获得的结果进行了比较。收集到的所有样本中的铀浓度都低于饮用水样本的可接受最高限值。
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来源期刊
CiteScore
4.40
自引率
8.30%
发文量
230
审稿时长
5.6 months
期刊介绍: JICS is an international journal covering general fields of chemistry. JICS welcomes high quality original papers in English dealing with experimental, theoretical and applied research related to all branches of chemistry. These include the fields of analytical, inorganic, organic and physical chemistry as well as the chemical biology area. Review articles discussing specific areas of chemistry of current chemical or biological importance are also published. JICS ensures visibility of your research results to a worldwide audience in science. You are kindly invited to submit your manuscript to the Editor-in-Chief or Regional Editor. All contributions in the form of original papers or short communications will be peer reviewed and published free of charge after acceptance.
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