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基于激光诱导击穿光谱的标准加入法的研究进展

Research progress of standard addition method based on laser-induced breakdown spectroscopy

  • 摘要: 基体效应是限制激光诱导击穿光谱(LIBS)发展的技术“短板”。为了降低基体效应,克服复杂基质标样难以获得的技术难点,标准加入法被引入LIBS技术领域。介绍了标准加入法的5种实施方式,指出了标准加入法辅助LIBS技术在环境、考古及矿物、食品及药材安全监测等领域的具体应用,讨论了在线、数据处理辅助和样品简化标准加入法3种改进方法的原理和应用,其中在线标准加入法可实现样品的自动化制样,提高LIBS技术定量分析的效率;数据处理辅助标准加入法弱化光谱背景干扰、光谱波动和自吸收效应,提高标准加入法辅助LIBS技术的定量分析准确度;样品简化标准加入法克服无法直接检测粉末样品的缺点,在简化样品数量的同时,提高标准加入法辅助LIBS技术的检测效率。基于上述应用进展及其改进方法,指出了标准加入法辅助LIBS技术在液体和粉末样品痕迹检测方面的优势。

     

    Abstract: Matrix effect was a technical limitation for the development of laser-induced breakdown spectroscopy (LIBS). To reduce the matrix effect and address the challenges in preparing standard complex matrix samples, standard addition method was introduced into the field of LIBS. Five implementation methods of standard addition method were introduced. The specific applications such as environmental monitoring, archaeology, mineral detection, food, and medicinal safety monitoring were summarized. The principles and applications of three improved methods: Online standard addition method, data processing assisted standard addition method, and sample simplification standard addition method were discussed. Online standard addition method can achieve the automated sample preparation and improve the efficiency of LIBS technology quantitative analysis. Data processing assisted standard addition method weakens spectral background interference, spectral fluctuations, and self-absorption effects, and improves the quantitative analysis accuracy of LIBS technology assisted by the standard addition method. Sample simplification standard addition method overcomes the disadvantage of not being able to directly detect powder samples, and improves the detection efficiency of LIBS technology assisted by standard addition method while simplifying the sample quantity. The progress in these applications and improvement methods indicate that standard addition method-LIBS has the advantages in the trace detection of liquid and powder samples.

     

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