Center of Advanced Sciences and Technologies (C.A.S.T.), University G. d'Annunzio of Chieti-Pescara, Via Luigi Polacchi 1, I-66100, Chieti, Italy; Laboratorio Acceleratori e Superconduttività Applicata (LASA), Department of Physics, University of Milan and INFN-Milan, Via F.lli Cervi 201, I-20090, Segrate, Italy.
Laboratorio Acceleratori e Superconduttività Applicata (LASA), Department of Physics, University of Milan and INFN-Milan, Via F.lli Cervi 201, I-20090, Segrate, Italy; Department of Physics, University of Milan, Via Celoria 16, I-20133, Milano, Italy.
Anal Chim Acta. 2022 Apr 1;1200:339601. doi: 10.1016/j.aca.2022.339601. Epub 2022 Feb 12.
A new instrumental neutron activation analysis (INAA) for the simultaneous determination of titanium (TiO) and silica (SiO) dioxide as UV-filters in sunscreens is described. Samples are encapsulated, neutron irradiated (30 s) and after a suitable decay (3 min), the induced Ti (T = 5.76 min) and Al (T = 6.56 min) radionuclides are measured for the emitted γ-ray fingerprint. Three applications were carried out: (i) screening study (analysis of commercial sunscreens in combination with single particle inductively coupled plasma mass spectrometry (sp-ICP-MS); (ii) research study (development of innovative UV-filters such as titanium dioxide or bismuth titanate loaded inorganic mesoporous silica nanoparticles, MSN); (iii) validation study (intercalibration of a spectrochemical method - inductively coupled plasma optical emission spectrometry, ICP-OES). Collectively, the nuclear method appears a powerful tool adequate for quantifying TiO and SiO in the above studies. The limited accessibility at the nuclear reactor for neutron activation is probably one of the reasons why the excellent characteristics of the nuclear technique are not always fully known and exploited in the industrial and research chemical world.
一种新的仪器中子活化分析（INAA）被用于同时测定防晒霜中的钛（TiO）和二氧化硅（SiO2）作为紫外线过滤器。将样品封装，进行中子辐照（30 秒），然后经过适当的衰变（3 分钟），测量诱导的 Ti（T=5.76 分钟）和 Al（T=6.56 分钟）放射性核素，以获得发射的γ射线指纹。进行了三个应用：（i）筛选研究（分析商业防晒霜，结合单颗粒电感耦合等离子体质谱（sp-ICP-MS）；（ii）研究性研究（开发创新的紫外线过滤器，如负载无机介孔硅纳米粒子的二氧化钛或钛酸铋，MSN）；（iii）验证研究（光谱化学方法的相互校准-电感耦合等离子体发射光谱法，ICP-OES）。总的来说，核方法似乎是一种强大的工具，适用于在上述研究中定量测定 TiO 和 SiO。在核反应堆中进行中子活化的有限可及性可能是核技术的优异特性在工业和研究化学领域并不总是完全被了解和利用的原因之一。
