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[Mapping Applications in Laser-Induced Breakdown Spectroscopy].

Qi-meng Chen, Min Du, Zhong-qi Hao

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
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    Laser-Induced Breakdown Spectroscopy (LIBS) mapping effectively analyzes elemental distribution on iron ore surfaces. This technique provides qualitative analysis of component gradients in heterogeneous samples with high resolution.

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    Area of Science:

    • Materials Science
    • Analytical Chemistry
    • Geoscience

    Background:

    • Accurate elemental distribution analysis is crucial for iron ore characterization.
    • Traditional methods may lack the resolution or speed for detailed surface analysis.
    • Laser-Induced Breakdown Spectroscopy (LIBS) offers a potential solution for rapid elemental mapping.

    Purpose of the Study:

    • To develop and validate a LIBS mapping technique for analyzing iron ore surfaces.
    • To determine the elemental distribution (Ca, Al, Ti, Mn) on natural iron ore.
    • To assess the capability of LIBS for qualitative analysis of component gradients.

    Main Methods:

    • Utilized a 532 nm Nd:YAG laser and self-developed software for LIBS analysis.
    • Established calibration curves using standard samples to correlate spectral intensity with element content.
    • Performed high-resolution (100 microns) surface scanning of natural iron ore samples (14 mm×11 mm).

    Main Results:

    • Generated two-dimensional concentration distribution profiles for elements like Ca, Al, Ti, and Mn.
    • Validated the mapping technology by comparing elemental distribution with surface morphology.
    • Demonstrated successful qualitative analysis of elemental distribution on heterogeneous iron ore surfaces.

    Conclusions:

    • LIBS mapping is a viable technique for qualitative elemental distribution analysis of iron ore.
    • The method provides detailed insights into component gradients on heterogeneous sample surfaces.
    • High-resolution LIBS mapping aids in understanding the complex composition of geological materials.