Degueldre C, Favarger P-Y
Department Nuclear Energy and Safety, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland.
Talanta. 2004 Apr 19;62(5):1051-4. doi: 10.1016/j.talanta.2003.10.016.
Thorium colloid analysis in water has been carried out by a single particle mode using inductively coupled plasma mass spectrometry (ICP-MS). The flash of ions due to the ionisation of a thorium colloidal particle in the plasma torch can be detected and measured in a time scan for (232)Th (+ ) or (248)[ThO] (+ ) according to the sensitivity required by the mass spectrometer. The peaks of the recorded intensity of the MS signal can be analysed as a function of the particle size or fraction of the studied element in the colloid phase. The frequency of the flashes is directly proportional to the concentration of particles in the colloidal suspension. After discussing Th colloid detection, on the basis of the intensity of the ion flashes generated in the plasma torch, tests were performed on thorium dioxide colloidal particles. This feasibility study also describes the experimental conditions and the limitation of the plasma design to detect thorium colloids in a single particle analysis mode down to about 10fg.
已通过电感耦合等离子体质谱法（ICP-MS）的单粒子模式对水中的钍胶体进行了分析。根据质谱仪所需的灵敏度，可在时间扫描中检测并测量等离子体炬中钍胶体颗粒电离产生的离子闪光，以检测（232）Th（+）或（248）[ThO]（+）。记录的质谱信号强度峰值可作为颗粒大小或胶体相中所研究元素的分数的函数进行分析。闪光频率与胶体悬浮液中颗粒的浓度成正比。在讨论了钍胶体检测之后，基于等离子体炬中产生的离子闪光强度，对二氧化钍胶体颗粒进行了测试。这项可行性研究还描述了在单粒子分析模式下检测低至约10fg钍胶体的实验条件以及等离子体设计的局限性。
