The laser-induced breakdown spectroscopy assisted by laser-induced fluorescence (LIBS-LIF) in a two-step process was used to measure the concentration of platinum (Pt) and palladium (Pd) by surface analysis of a solid ore core from the Lac des Iles mine followed by analysis of the same core that was pulverized and compacted. This work focuses mainly on the measurement of Pt since the case of Pd has been extensively discussed in previous work. The excitation of Pt is performed at 235.71 nm with fluorescence emission observed near 269.84 nm. Calibration was performed with synthetic samples prepared from the same ore as the samples studied and the calibration curve shows good linearity in Pt content over several orders of magnitude. A limit of detection (LOD) of approximately 0.15 parts per million (ppm) over an average of 200 laser shots was demonstrated. In contrast, conventional LIBS provides a LOD of about 21 ppm over an average of 200 laser shots due to low signal-to-noise ratio and spectral interference from other elements and does not meet the requirements for estimating the average Pt concentration in the ore. The Pt concentrations obtained using LIBS-LIF on solid ore are generally in good agreement with those obtained in its pulverized and compacted form, as well as with laboratory measurements made by conventional chemical methods. However, the comparison of the results obtained for Pd using LIBS-LIF with the laboratory showed a less satisfactory agreement, probably due to its more inhomogeneous distribution in the ore.

中文翻译：

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使用激光诱导荧光 (LIBS-LIF) 技术辅助的激光诱导击穿光谱定量固体矿石中的铂和钯。

采用两步过程中激光诱导荧光 (LIBS-LIF) 辅助的激光诱导击穿光谱法，通过对 Lac 固体矿芯进行表面分析来测量铂 (Pt) 和钯 (Pd) 的浓度des Iles 矿山随后对粉碎和压实的同一核心进行了分析。这项工作主要关注 Pt 的测量，因为 Pd 的情况在之前的工作中已被广泛讨论。Pt 的激发在 235.71 nm 处进行，在 269.84 nm 附近观察到荧光发射。使用与研究样品相同的矿石制备的合成样品进行校准，校准曲线显示 Pt 含量在几个数量级上具有良好的线性。平均 200 次激光照射的检测限 (LOD) 约为百万分之 0.15 (ppm)。相比之下，由于信噪比低和其他元素的光谱干扰，传统 LIBS 在平均 200 次激光照射中提供的 LOD 约为 21 ppm，并且不满足估计矿石中平均 Pt 浓度的要求。使用 LIBS-LIF 在固体矿石上获得的 Pt 浓度通常与其粉碎和压实形式获得的浓度以及通过传统化学方法进行的实验室测量非常一致。然而，使用 LIBS-LIF 与实验室获得的 Pd 结果的比较显示出不太令人满意的一致性，这可能是由于其在矿石中的分布更加不均匀。