Determination of thallium traces by ETAAS after on-line matrix separation and preconcentration in a flow injection system
Determination of thallium traces by ETAAS after on-line matrix separation and preconcentration in a flow injection system
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DOI：
10.1590/s0103-50532007000700010
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发表时间：
2007-01-01
影响因子：
1.4
通讯作者：
Shabani, Ali Mohammad Haji
中科院分区：
文献类型：
--
作者：
Asadoulahi, Taherah;Dadfarnia, Shayessteh;Shabani, Ali Mohammad Haji
建立了一种简单、灵敏的流动注射体系，用于铊的分离、富集和测定。预浓缩是基于固定在表面活性剂涂覆的氧化铝上的二苯并-18-冠-6（DB 18 C6）的微柱上的分析物吸附，随后使用硝酸溶液（500 μ L，2 mol L-1）洗脱。采用火焰原子吸收光谱法测定了洗脱液中铊的浓度。研究了影响吸附和解吸铊离子的因素。使用5 mL的样品体积，校准是线性的0.1至20 μ g L-1的范围（r = 0.9996）与0.05 μ g L-1的检测限。最大吸附容量为1432微克铊每克吸附剂。在1 μ g L ~（-1）浓度下，方法的精密度为5.7%RSD（n = 11）。该方法用于测定水，头发，指甲，和标准参考样品中的铊。采用加标回收实验或与标准物质比较，评价方法的准确度。
A simple and sensitive flow injection system was developed for separation, preconcentration and determination of thallium. Preconcentration is based on the analyte sorption on a microcolumn of dibenzo-18-crown-6(DB18C6) immobilized on surfactant coated alumina with subsequent elution using a nitric acid solution (500 mu L, 2 mol L-1). The concentration of thallium in the eluent was determined using electrothermal atomic absorption spectrometry. Factors influencing the sorption and desorption of thallium ion were investigated. Using a sample volume of 5 mL, the calibration was linear from 0.1 to 20 mu g L-1 range (r = 0.9996) with a detection limit of 0.05 mu g L-1. The maximum sorption capacity was 1432 mu g of thallium per gram of sorbent. The precision of the method at 1 mu g L-1 was 5.7% RSD (n = 11). The method was applied for determination of thallium in water, hair, nail, and standard reference samples. The accuracy was assessed using addition-recovery experiment or by comparison of the results with certified reference materials.