Laser-induced breakdown spectroscopy (LIBS) was explored as a method of monitoring oxygen (O) concentration in electrolytic reduction salt of pyroprocessing. Simulated salt samples were fabricated, and each sample was put in a transparent and sealed vial filled with argon gas. An Nd:YAG laser pulse was applied to the sample through the vial surface, and the optical emission spectrum was measured. O(I) 777.2 nm lines were clearly identified in the spectrum of a sample containing Li₂O, and the intensity of the O peak and the intensity ratio of O and lithium (Li) peaks, in which Li was used as the normalization, increased linearly as the O concentration in the salt sample was increased. The limit of detection and root mean square error were calculated for the cases of O peak area, O peak height, peak area ratio of O–Li, and the peak height ratio of O–Li, and all the cases could indicate that the O concentration in the electrolytic reduction salt was out of normal range. Our result shows that LIBS has the possibility to be used as a method for monitoring of O in electrolytic reduction salt.

激光诱导击穿光谱 (LIBS) 被用作监测高温处理电解还原盐中氧 (O) 浓度的方法。制作模拟盐样品，并将每个样品放入充满氩气的透明密封小瓶中。通过小瓶表面将 Nd:YAG 激光脉冲施加到样品，并测量光发射光谱。在含有 Li ₂的样品的光谱中清楚地识别出 O(I) 777.2 nm 谱线O 和 O 峰的强度以及 O 和锂 (Li) 峰的强度比（其中 Li 用作归一化）随着盐样品中 O 浓度的增加而线性增加。分别计算了O峰面积、O峰高、O-Li峰面积比和O-Li峰高比的检测限和均方根误差，所有情况都可以表明O电解还原盐中的浓度超出正常范围。我们的结果表明 LIBS 有可能用作监测电解还原盐中 O 的方法。