3 years ago

Determination of Carbon Content in Steels Using Laser-Induced Breakdown Spectroscopy Assisted with Laser-Induced Radical Fluorescence

Determination of Carbon Content in Steels Using Laser-Induced Breakdown Spectroscopy Assisted with Laser-Induced Radical Fluorescence
Yongfeng Lu, Xiangyou Li, Xiaoyan Zeng, Xinyan Yang, Zhihao Zhu, Rongxing Yi, Jiaming Li, Lianbo Guo, Ran Zhou, Nan Zhao
Carbon is a key element for steel properties but hard to be determined by laser-induced breakdown spectroscopy (LIBS). Utilizing the combination of carbon in analytes and nitrogen in ambient gas to generate carbon–nitrogen (CN) radicals, LIBS assisted with laser-induced radical fluorescence (LIBS-LIRF) was proposed to resonantly excite radicals instead of atoms in plasmas. The CN radicals in the B2Σ-A2Π band were stimulated by a 421.60 nm laser wavelength and emitted 388.34 nm fluorescence. The results show that the spectral intensity of the CN radicals was enhanced by 2 orders of magnitude using LIBS-LIRF. Then carbon content in steels was accurately and sensitively determined without spectral interference. The limits of detection (LoDs) were 0.039 and 0.013 wt % in air and nitrogen gas, respectively. The limits of quantification (LoQs) were 0.130 and 0.043 wt % in air and nitrogen gas, respectively. This work demonstrated the feasibility of LIBS to realize reliable carbon determination in steel industry.

Publisher URL: http://dx.doi.org/10.1021/acs.analchem.7b01932

DOI: 10.1021/acs.analchem.7b01932

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