Department of Chemistry, College of Science, Shahid Chamran University, Ahvaz, Iran.
J Hazard Mater. 2010 Jan 15;173(1-3):110-4. doi: 10.1016/j.jhazmat.2009.08.055. Epub 2009 Aug 20.
A selective method for the determination of thorium (IV) using an optical sensor is described. The sensing membrane is prepared by immobilization of thorin-methyltrioctylammonium ion pair on triacetylcellulose polymer. The sensor produced a linear response for thorium (IV) concentration in the range of 6.46 x 10(-6) to 9.91 x 10(-5)mol L(-1) with detection limit of 1.85 x 10(-6)mol L(-1). The regeneration of optode was accomplished completely at a short time (less than 20s) with 0.1 mol L(-1) of oxalate ion solution. The relative standard deviation for ten replicate measurements of 2.15 x 10(-5) and 8.62 x 10(-5)mol L(-1) of thorium was 2.71 and 1.65%, respectively. The optode membrane exhibits good selectivity for thorium (IV) over several other ionic species and are comparable to those obtained in case of spectrophotometric determination of thorium using thorin in solution. A good agreement with the ICP-MS and spiked method was achieved when the proposed optode was applied to the determination of thorium (IV) in dust and water samples.
一种使用光学传感器测定钍（IV）的选择性方法。传感膜是通过将三乙酰纤维素聚合物上的三嗪-甲基三辛基铵离子对固定化来制备的。该传感器对钍（IV）浓度在 6.46 x 10(-6) 至 9.91 x 10(-5)mol L(-1)范围内产生线性响应，检测限为 1.85 x 10(-6)mol L(-1)。通过 0.1 mol L(-1)的草酸盐离子溶液，可以在很短的时间（少于 20 秒）内完全再生光学位。对于 2.15 x 10(-5) 和 8.62 x 10(-5)mol L(-1)的钍的十个重复测量的相对标准偏差分别为 2.71%和 1.65%。与溶液中使用三嗪分光光度法测定钍时相比，该光学位膜对其他几种离子具有良好的选择性。当将所提出的光学位应用于测定灰尘和水样中的钍（IV）时，与 ICP-MS 和加标法吻合良好。
