Gondal Mohammed A, Dastageer Mohamed A, Naqvi Akhtar A, Isab Anvar A, Maganda Yasin W
Physics Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia.
Appl Opt. 2012 Oct 20;51(30):7395-401. doi: 10.1364/AO.51.007395.
A laser induced breakdown spectroscopic (LIBS) system was developed using a 266 nm laser and a high-resolution spectrograph (Andor SR 500 i-A) to detect the trace levels of the highly toxic metals such as lead and chromium present in different brands of talcum powder available in the local market. The strongest atomic transition lines of lead (Pb) (405.7 nm) and chromium (Cr) (425.4 nm) were used as spectral markers to simultaneously detect lead and chromium. The LIBS system was calibrated for these two heavy metals, and the system was able to detect 15-20 parts per million (ppm) of lead and 20-30 ppm of chromium in the talcum powder sample. The limits of detection of the LIBS system were also estimated, and they are 1.96 and 1.72 ppm per million respectively for lead and chromium. This study is highly significant due to the use of cosmetic products that could affect the health of millions of people around the globe.
利用一台266纳米激光器和一台高分辨率光谱仪（安道尔SR 500 i - A）开发了一种激光诱导击穿光谱（LIBS）系统，用于检测当地市场上不同品牌滑石粉中存在的痕量剧毒金属，如铅和铬。铅（Pb）的最强原子跃迁线（405.7纳米）和铬（Cr）的最强原子跃迁线（425.4纳米）被用作光谱标记物，以同时检测铅和铬。对LIBS系统进行了这两种重金属的校准，该系统能够检测滑石粉样品中百万分之15 - 20（ppm）的铅和百万分之20 - 30的铬。还估算了LIBS系统的检测限，铅和铬的检测限分别为百万分之1.96和1.72 ppm。由于使用的化妆品可能会影响全球数百万人的健康，这项研究具有重大意义。
