Bhatt Chet R, Yueh Fang Y, Singh Jagdish P
Appl Opt. 2017 Mar 10;56(8):2280-2287. doi: 10.1364/AO.56.002280.
Univariate and multivariate analyses of six rare earth elements [cerium (Ce), europium (Eu), gadolinium (Gd), neodymium (Nd), samarium (Sm), and yttrium (Y)] have been performed using data from laser-induced breakdown spectroscopy (LIBS). Binary mixtures of oxide forms of each rare earth element in an AlO matrix with their concentrations varying from 1% to 10% by weight in powder form were used as working samples for univariate analysis. For multivariate analysis, complex mixtures of oxides of all these six rare earth elements and AlO in powder form, where the concentration of each element oxide was varied from 1% to 50% by weight one by one, were used to record LIBS spectra. Optimum values of gate delay, gate width, and laser energy were used to get spectra from these samples and spectra were used to develop calibration models. The limits of detection for Ce, Eu, Gd, Nd, Sm, and Y were calculated to be 0.098%, 0.052%, 0.077%, 0.047%, 0.250%, and 0.036%, respectively, from the calibration curves.
利用激光诱导击穿光谱（LIBS）数据，对六种稀土元素[铈（Ce）、铕（Eu）、钆（Gd）、钕（Nd）、钐（Sm）和钇（Y）]进行了单变量和多变量分析。以AlO基体中各稀土元素氧化物的二元混合物为工作样品进行单变量分析，这些混合物为粉末形式，其浓度按重量计从1%到10%不等。对于多变量分析，使用这六种稀土元素的氧化物与AlO的复杂粉末混合物，其中每种元素氧化物的浓度逐一按重量计从1%变化到50%，用于记录LIBS光谱。使用门延迟、门宽度和激光能量的最佳值从这些样品中获取光谱，并将光谱用于建立校准模型。根据校准曲线计算得出，Ce、Eu、Gd、Nd、Sm和Y的检测限分别为0.098%、0.052%、0.077%、0.047%、0.250%和0.036%。
