Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, United States.
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, United States.
J Chromatogr A. 2020 Nov 8;1631:461588. doi: 10.1016/j.chroma.2020.461588. Epub 2020 Sep 28.
Technetium poses an environmental hazard because of its radioactivity and long half-life. It exists in the form of pertechnetate in the environment and can be modeled by the nonradioactive ion perrhenate, since pertechnetate and perrhenate have the same geometry and similar chemical properties. In this research, a new zinc cyclen resorcinarene cavitand (ZCR) column was used in ion chromatography (IC) to efficiently separate perrhenate. Ion chromatography has the advantage of requiring almost no sample preparation for water samples. The ZCR column demonstrated the ability to separate anions: fluoride, chloride, nitrate, sulfate, phosphate, perchlorate, and perrhenate by gradient 2-60 mM NaOH. Unlike other columns, the new column material was selective in retaining perrhenate. The ZCR column also gave a linear range from 2.0 to 1000 mg L for perrhenate with R > 0.997. There was a logarithmic relationship between the concentration of perrhenate and its retention time. Excellent perrhenate recovery was achieved on the ZCR column when river water was spiked with perrhenate and perrhenate was preconcentrated. The efficient separations of perrhenate by the ZCR column will potentially assist in pertechnetate separations.
锝因其放射性和长半衰期而对环境构成危害。它以高锝酸盐的形式存在于环境中，可以用非放射性的铼酸盐来模拟，因为高锝酸盐和铼酸盐具有相同的几何形状和相似的化学性质。在这项研究中，一种新的锌环轮缩芳烃 Cavitand（ZCR）柱在离子色谱（IC）中用于有效地分离高铼酸盐。离子色谱法的优点是几乎不需要对水样进行预处理。ZCR 柱能够通过梯度 2-60mM NaOH 分离阴离子：氟化物、氯化物、硝酸盐、硫酸盐、磷酸盐、高氯酸盐和高铼酸盐。与其他柱不同，新的柱材料对保留高铼酸盐具有选择性。ZCR 柱对高铼酸盐的线性范围为 2.0 至 1000mg L，相关系数 R>0.997。高铼酸盐的浓度与其保留时间之间存在对数关系。当河水中加入高铼酸盐并对其进行预浓缩时，ZCR 柱上实现了高铼酸盐的高回收率。ZCR 柱对高铼酸盐的高效分离有望有助于锝酸盐的分离。
