Direct quantification of total organic carbon in soils using native CN and C <sub>2</sub> molecular emissions by laser-induced breakdown spectroscopy (LIBS)
Balbino, Rafael Rodrigues ; Sadik Gavrilov, Yusef (Universidad de Zaragoza) ; Senesi, Giorgio Saverio ; Gomes Neto, José Anchieta ; Ferreira, Edilene Cristina
Resumen: The soil carbon cycle plays a central role in global warming, making accurate mapping of Total Organic Carbon (TOC) in soils essential for climate change mitigation. Conventional TOC determination methods are often time-consuming, costly, error-prone, and environmentally unsustainable due to the use of chemical reagents and extensive sample preparation. This study introduces a proof of concept for a chemically grounded LIBS-based approach that enables the direct quantification of TOC in soils by exploiting the emission of native CN and C2 molecular species. Two Laser-Induced Breakdown Spectroscopy (LIBS) systems, Spark Discharge-assisted LIBS (SD-LIBS) and a handheld LIBS device (hLIBS), were evaluated using soil samples with different textures and TOC levels. Argon purging ensured inert plasma conditions favoring CN and C2 native species in the plasma, while Ar emission lines were used to perform spectral normalization. For SD-LIBS, a Partial Least Squares (PLS) model based on 12 CN and C2 wavelengths achieved an R = 0.90 in calibration and an R = 0.82 (MAE = 0.33%) in validation. The hLIBS model, combining 12 CN and C2 emission bands and 8 more correlation-selected wavelengths, yielded R = 0.96 for calibration and R = 0.79 (MAE = 0.38%) for validation. Both systems delivered comparable analytical performance, demonstrating the feasibility of rapid, reagent-free, and in situ TOC quantification in soils. The proposed approach paves the way toward sustainable soil monitoring and carbon management strategies.
Idioma: Inglés
DOI: 10.1039/d5ja00411j
Año: 2026
Publicado en: Journal of Analytical Atomic Spectrometry (2026), [9 pp.]
ISSN: 0267-9477
Tipo y forma: Article (Published version)
Área (Departamento): Área Química Analítica (Dpto. Química Analítica)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.
Exportado de SIDERAL (2026-02-05-14:36:53)
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Idioma: Inglés
DOI: 10.1039/d5ja00411j
Año: 2026
Publicado en: Journal of Analytical Atomic Spectrometry (2026), [9 pp.]
ISSN: 0267-9477
Tipo y forma: Article (Published version)
Área (Departamento): Área Química Analítica (Dpto. Química Analítica)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. Exportado de SIDERAL (2026-02-05-14:36:53)
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Record created 2026-02-05, last modified 2026-02-05