A modified method of separating Tl(I) and Tl(III) in aqueous samples using solid phase extraction

A modified method of separating Tl(I) and Tl(III) in aqueous samples using solid phase extraction
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固相萃取分离水样中 Tl(I) 和 Tl(III) 的改进方法

DOI:
10.1186/s13065-018-0502-6
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发表时间:
2018-12
影响因子:
--
通讯作者:
Baveye Philippe C.
Baveye Philippe C.
中科院分区:
化学3区
文献类型:
--
作者:
Xiao Qingxiang;Rasool Atta;Xiao Tangfu;Baveye Philippe C.

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尽管近年来发展了新的测量技术,但环境水样中铊的快速准确形态仍然是一个挑战。在此背景下,提出了一种新的固相萃取(SPE)方法,采用阴离子交换树脂AG1-X8分离Tl(I)和Tl(III)。在二乙烯三胺五乙酸(DTPA)存在的情况下,Tl(III)和Tl(I)可以通过Tl(III)-DTPA在树脂上的选择性吸附分离,Tl(III)用SO2和HCl溶液洗脱。通过对Tl(I)和Tl(III)标准溶液的测定,证实了该方法的有效性。结果表明,该方法即使在Tl(I)/Tl(III)比例较高的溶液中也具有出色的性能,并且可以应用于具有高浓度其他电解质的水溶液样品,这些电解质可能会干扰测量。便携式设备和试剂使得在现场常规使用所提出的方法成为可能。
In spite of the development of new measurement techniques in recent years, the rapid and accurate speciation of thallium in environmental aqueous samples remains a challenge. In this context, a novel method of solid phase extraction (SPE), involving the anion exchange resin AG1-X8, is proposed to separate Tl(I) and Tl(III). In the presence of diethylene triamine pentacetate acid (DTPA), Tl(III) and Tl(I) can be separated by selective adsorption of Tl(III)-DTPA onto the resin, Tl(III) is then eluted by a solution of HCl with SO2. The validity of this method was confirmed by assays of standard solutions of Tl(I) and Tl(III). The proposed method is shown to have an outstanding performance even in solutions with a high ratio of Tl(I)/Tl(III), and can be applied to aqueous samples with a high concentration of other electrolytes, which could interfere with the measurement. Portable equipment and reagents make it possible to use the proposed method routinely in the field.
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