Department of Analytical Chemistry and Environmental Control, Atomic Energy Authority, Cairo, Egypt.
Anal Chem. 2011 Jun 15;83(12):4759-66. doi: 10.1021/ac103311p. Epub 2011 May 24.
The present study was oriented to prepare new scintillating anion-exchange resins for measurement of (99)TcO(4)(-) in natural waters. The organic fluor 2-(1-naphthyl)-5-phenyloxazole was diffused into (chloromethyl)polystyrene resin. Thereafter, a thin layer of poly[[2-(methacryloyloxy)ethyl]trimethylammonium chloride] was grafted from the resin surface by surface-initiated atom transfer radical polymerization as an attempt to overcome potential problems related to the leaching of fluor molecules during usage. The residual chloromethyl groups of the polymer-coated resin were aminated by reaction with two different tertiary amines, triethylamine (TEA) and methyldioctylamine (MDOA). Off- and on-line quantification of (99)Tc was achieved with high detection efficiencies of 60.72 ± 1.93% and 72.83 ± 0.81% for resin with TEA and MDOA functional groups, respectively. The detection limit was determined to be less than the maximum contaminant level (33 Bq L(-1)) established under the Safe Drinking Water Act. The two functionalized resins were demonstrated to be selective for pertechnetate from synthetic groundwater containing up to 1000 ppm Cl(-), SO(4)(2-), and HCO(3)(-) and up to 1200 ppb Cr(2)O(7)(2-) in an acidic medium.
本研究旨在制备用于测量天然水中 (99)TcO(4)(-) 的新型闪烁阴离子交换树脂。将有机荧光体 2-(1-萘基)-5-苯并恶唑扩散到 (氯甲基)聚苯乙烯树脂中。此后，通过表面引发原子转移自由基聚合从树脂表面接枝一层薄薄的聚[[2-(甲基丙烯酰氧)乙基]三甲基氯化铵]，试图克服在使用过程中氟分子浸出的潜在问题。聚合物涂层树脂的残余氯甲基基团与两种不同的叔胺，三乙胺（TEA）和甲二辛基胺（MDOA）反应进行胺化。用 TEA 和 MDOA 官能团的树脂分别实现了 (99)Tc 的离线和在线定量，检测效率分别为 60.72±1.93%和 72.83±0.81%。检测限确定为低于安全饮用水法案规定的最大污染物水平（33 Bq L(-1))。这两种官能化树脂被证明对含有高达 1000 ppm Cl(-)、SO(4)(2-)和 HCO(3)(-)和高达 1200 ppb Cr(2)O(7)(2-)的合成地下水中的高氯酸盐具有选择性，在酸性介质中。
