Improved Measurement Performance of Inorganic Elements in Coal by Laser-Induced Breakdown Spectroscopy Coupled with Internal Standardization

YAO Shunchun (姚顺春); XU Jialong (徐嘉隆); BAI Kaijie (白凯杰); LU Jidong (陆继东)

doi:10.1088/1009-0630/17/11/09

Plasma Science and Technology > 2015 > 17(11): 938-943. > DOI: 10.1088/1009-0630/17/11/09

YAO Shunchun (姚顺春), XU Jialong (徐嘉隆), BAI Kaijie (白凯杰), LU Jidong (陆继东). Improved Measurement Performance of Inorganic Elements in Coal by Laser-Induced Breakdown Spectroscopy Coupled with Internal Standardization[J]. Plasma Science and Technology, 2015, 17(11): 938-943. DOI: 10.1088/1009-0630/17/11/09

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Improved Measurement Performance of Inorganic Elements in Coal by Laser-Induced Breakdown Spectroscopy Coupled with Internal Standardization

1School of Electric Power, South China University of Technology, Guangzhou 510640, China 2State Key Laboratory of Pulsed Power Laser Technology, Electronic Engineering Institute, Hefei 230037, China

Funds: supported by Open Research Fund of State Key Laboratory of Pulsed Power Laser Technology of China (No. SKL2013KF03),National Natural Science Foundation of China (Nos. 51206055, 51476061), the Fundamental Research Funds for the Central Universities of China (No. 2014ZZ0014), the New Star of Pearl River on Science and Technology of Guangzhou, China (No. 2014J2200054), the Key Laboratory of Efficient and Clean Energy Utilization of Guangdong Higher Education Institutes of China (No. KLB10004) and Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, China (No. 2013A061401005)

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Received Date: March 10, 2015

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Abstract

Abstract

Laser-induced breakdown spectroscopy was employed to determine the inorganic elements in coal. To improve the measurement’s accuracy and precision, a new internal stan?dardization scheme, which we named changed internal standardization, was compared with the traditional internal standardization and no internal standardization for the analysis of inorganic el?ements. The new internal standardization scheme used the atomic line of carbon at 247.86 nm and the molecular band of CN at 388.34 nm and C2 at 516.32 nm to normalize the lines of inorganic elements that were distributed in the same spectral channel. The performance of the utilization of the new internal standardization scheme was evaluated using a set of coal samples, including twenty calibration samples and five validation samples. The results show that the coefficients of determination R2 and the slope of calibration models coupled with changed internal standard?ization are better than that of the calibration models coupled with fixed internal standardization and no internal standardization. Moreover, the measurement accuracy and reproducibility of changed internal standardization for the analysis of five validation samples also yielded further improvement. The results that we obtained suggest that changed internal standardization could compensate for the matrix effects, as well as the influence of the difference in the spectral response of the light collection system.
- laser-induced breakdown spectroscopy,
- coal,
- internal standardization,
- inorganic elements

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References

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