Chao Li, Tao Zhang, Yaru Li, Runhao Li, Xuan Liu, Caijie Liu, Zhongyi Bao, Qibin Zhang, Yunfeng Bi
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引用次数: 0
Abstract
The integration process of the spectrometer detector is a critical step in Laser-Induced Breakdown Spectroscopy (LIBS) signal acquisition. However, the influence of plasma radiation attenuation during the integration time on LIBS uncertainty remains unclear. In this study, plasma emission was simultaneously monitored using a combined detection system consisting of an echelle spectrometer with an intensified charge-coupled device (ICCD) and a monochromator with a photomultiplier tube (PMT). Based on this setup, the effect of radiation attenuation rate on spectral line intensity was investigated, and a real-time uncertainty correction method using the attenuation rate was developed. Results show that in repeated independent measurements of a homogeneous sample, the radiation attenuation rate at any wavelength is inversely correlated with spectral line intensity. In contrast, for samples with varying contents of the same element, no statistically significant correlation was found between attenuation rate and elemental content. These findings indicate that the radiation attenuation rate is indeed a factor contributing to LIBS signal uncertainty. Moreover, using radiation attenuation rates as correction coefficients for spectral line intensities reduced the relative standard deviation (RSD) of repeated measurements and improved the coefficient of determination (R2) of calibration curves for gradient-content samples. This work clarifies the relationship between plasma radiation attenuation rate and line intensity, and examines its impact on repeatability and quantitative analysis. The results further refine existing theories and provide valuable insights for the theoretical development and broader application of LIBS technology.
期刊介绍：
Talanta provides a forum for the publication of original research papers, short communications, and critical reviews in all branches of pure and applied analytical chemistry. Papers are evaluated based on established guidelines, including the fundamental nature of the study, scientific novelty, substantial improvement or advantage over existing technology or methods, and demonstrated analytical applicability. Original research papers on fundamental studies, and on novel sensor and instrumentation developments, are encouraged. Novel or improved applications in areas such as clinical and biological chemistry, environmental analysis, geochemistry, materials science and engineering, and analytical platforms for omics development are welcome.
Analytical performance of methods should be determined, including interference and matrix effects, and methods should be validated by comparison with a standard method, or analysis of a certified reference material. Simple spiking recoveries may not be sufficient. The developed method should especially comprise information on selectivity, sensitivity, detection limits, accuracy, and reliability. However, applying official validation or robustness studies to a routine method or technique does not necessarily constitute novelty. Proper statistical treatment of the data should be provided. Relevant literature should be cited, including related publications by the authors, and authors should discuss how their proposed methodology compares with previously reported methods.
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