000168453 001__ 168453
000168453 005__ 20260205155159.0
000168453 0247_ $$2doi$$a10.1039/d5ja00411j
000168453 0248_ $$2sideral$$a147903
000168453 037__ $$aART-2026-147903
000168453 041__ $$aeng
000168453 100__ $$aBalbino, Rafael Rodrigues
000168453 245__ $$aDirect quantification of total organic carbon in soils using native CN and C <sub>2</sub> molecular emissions by laser-induced breakdown spectroscopy (LIBS)
000168453 260__ $$c2026
000168453 5060_ $$aAccess copy available to the general public$$fUnrestricted
000168453 5203_ $$aThe 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.
000168453 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttps://creativecommons.org/licenses/by-nc/4.0/deed.es
000168453 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000168453 700__ $$aSadik Gavrilov, Yusef$$uUniversidad de Zaragoza
000168453 700__ $$aSenesi, Giorgio Saverio
000168453 700__ $$aGomes Neto, José Anchieta
000168453 700__ $$aFerreira, Edilene Cristina
000168453 7102_ $$12009$$2750$$aUniversidad de Zaragoza$$bDpto. Química Analítica$$cÁrea Química Analítica
000168453 773__ $$g(2026), [9 pp.]$$pJ. anal. at. spectrom.$$tJournal of Analytical Atomic Spectrometry$$x0267-9477
000168453 8564_ $$s1275470$$uhttps://zaguan.unizar.es/record/168453/files/texto_completo.pdf$$yVersión publicada
000168453 8564_ $$s2820477$$uhttps://zaguan.unizar.es/record/168453/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000168453 909CO $$ooai:zaguan.unizar.es:168453$$particulos$$pdriver
000168453 951__ $$a2026-02-05-14:36:53
000168453 980__ $$aARTICLE