Department of Environmental Engineering and Earth Sciences, Clemson University, Clemson, South Carolina 29634-0919, USA.
Anal Chem. 2011 Apr 1;83(7):2582-8. doi: 10.1021/ac102880c. Epub 2011 Mar 2.
The objective of this research was to develop a scintillating anion exchange resin selective for monitoring (129)I at concentrations at or below ~0.4 Bq/L. One of the primary long-term risk-drivers and contaminants associated with nuclear waste sites is (129)I. Synthesis of scintillating anion exchange resin consisted of diffusing a fluor, 2-(1-naphthyl)-5-phenyloxazole (α-NPO), into a polymeric resin. The resultant scintillating resin was further modified by amination with N-methyldi-n-octylamine (MDOA) to serve as an anion exchange group. Radiochromatography columns were prepared with the synthesized resin for use in a variety of flow-cell experiments utilizing a standard (129)I solution in a synthetic groundwater to determine the properties (selectivity, interferences, loading efficiency, kinetics, capacity, and detection efficiency) of the resin. Column effluents were quantified by liquid scintillation. Average loading and detection efficiencies have been measured at 91 ± 9% and 50 ± 4%, respectively. Finally, batch sorption studies indicated fast iodide sorption rates (90% loading in ~10 min) for the resin, and dynamic sorption tracer studies indicated an iodide capacity of approximately 7,800 μg/g at 10% breakthrough.
本研究的目的是开发一种对监测浓度在 0.4 Bq/L 或以下的 (129)I 具有选择性的闪烁阴离子交换树脂。与核废料场相关的主要长期风险驱动因素和污染物之一是 (129)I。闪烁阴离子交换树脂的合成包括将荧光体 2-(1-萘基)-5-苯并恶唑（α-NPO）扩散到聚合物树脂中。所得的闪烁树脂进一步用 N-甲基二正辛基胺（MDOA）进行胺化，作为阴离子交换基团。利用标准的 (129)I 溶液在合成地下水中制备了放射性色谱柱，用于进行各种流动池实验，以确定树脂的特性（选择性、干扰、负载效率、动力学、容量和检测效率）。通过液体闪烁法定量测定柱流出物。平均负载和检测效率分别为 91±9%和 50±4%。最后，批处理吸附研究表明树脂对碘化物的吸附速率很快（约 10 分钟内达到 90%的负载），动态吸附示踪研究表明在 10%穿透时碘化物的容量约为 7800μg/g。
