Abstract This paper demonstrates the capabilities of laser-induced breakdown spectroscopy (LIBS) to perform quantitative multi-elemental analysis in phosphate slurries and pressed pellets. Fourteen phosphate powder samples were used in this study. 30 ml (12–13 g) of each phosphate powder sample were pelletized using an automated hydraulic press, and eleven slurries having a solid density of 30% (w/v) were prepared by mixing an appropriate quantity of powder and water. Samples were then analyzed by the Dual-LIBS instrument. A calibration model was generated for several elements contained in the samples, namely phosphorus, aluminum, iron, carbon, silicon, and magnesium, using a multivariate linear regression (MLR) method. The accuracy and reproducibility of the multivariate model were evaluated using independent validation samples sets. Correlation with R-squared of ~0.99 was found between the calculated and reference concentrations, which indicates that LIBS is a promising technique for the in situ rapid determination of the major elements present in solid and slurry phosphate samples.

中文翻译：

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使用激光诱导击穿光谱快速分析磷酸盐浆液和压片

摘要 本文展示了激光诱导击穿光谱 (LIBS) 对磷酸盐浆液和压制球团进行定量多元素分析的能力。本研究中使用了 14 种磷酸盐粉末样品。使用自动液压机将 30 ml (12-13 g) 的每种磷酸盐粉末样品造粒，并通过混合适量的粉末和水制备 11 种固体密度为 30% (w/v) 的浆液。然后通过双 LIBS 仪器分析样品。使用多元线性回归 (MLR) 方法为样品中包含的几种元素生成校准模型，即磷、铝、铁、碳、硅和镁。使用独立的验证样本集评估多变量模型的准确性和再现性。