Accurate quantitative analysis of metal oxides by laser-induced breakdown spectroscopy with a fixed plasma temperature calibration method
Accurate quantitative analysis of metal oxides by laser-induced breakdown spectroscopy with a fixed plasma temperature calibration method
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DOI：
10.1039/c2ja30160a
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发表时间：
2012-10
影响因子：
3.4
通讯作者：
Jun Zhang;Gang Ma;Huanhuan Zhu;J. Xi;Z. Ji
中科院分区：
文献类型：
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作者：
Jun Zhang;Gang Ma;Huanhuan Zhu;J. Xi;Z. Ji
采用固定等离子体温度校准方法，采用激光诱导击穿光谱 (LIBS) 对 Al2O3 中的钛 (Ti) 进行准确定量分析。采用固定激光脉冲能量和固定等离子体温度两种校准方法建立了被测样品中Ti的校准曲线。实验结果表明，由于强基体效应导致不同Ti含量样品的等离子体温度存在差异，传统LIBS采用的固定激光脉冲能量校准方法不适合Al2O3中Ti的分析。相反，固定等离子体温度的校准方法可以最大限度地减少基质效应并提供更准确的校准曲线。固定等离子体温度的校准曲线的相关系数R2达到0.9938，相对标准偏差为4.3%，与固定激光脉冲能量的校准曲线的0.9457和12.5%相比，显着提高。结果表明，采用固定等离子体温度校准方法的 LIBS 技术在金属氧化物中的金属分析方面具有巨大的潜力。
Titanium (Ti) in Al2O3 was accurately and quantitatively analyzed by laser-induced breakdown spectroscopy (LIBS) with a fixed plasma temperature calibration method. Two calibration methods with fixed energy of laser pulses and fixed plasma temperature were employed to establish the calibration curves of Ti in the measured samples. Experimental results showed that the calibration method with fixed energy of laser pulses traditionally used in LIBS is not suitable for the analysis of Ti in Al2O3 due to the difference of the plasma temperature of samples with different Ti content caused by strong matrix effects. Instead, the calibration method with fixed plasma temperature can minimize the matrix effects and provide a more accurate calibration curve. The correlation coefficients R2 of the calibration curve with fixed plasma temperature reaches 0.9938 with a relative standard deviation of 4.3%, which is significantly improved compared with values of 0.9457 and 12.5% for the calibration curve with fixed energy of laser pulses. The results illustrate that the LIBS technique with the fixed plasma temperature calibration method presents great potential for the analysis of metal in metal oxides.