Total carbon measurement in whole tropical soil sample

Silva, Robson Marinho da; Milori, Débora Marcondes Bastos Pereira; Ferreira, E.; Ferreira, Ednaldo José; Krug, Francisco José; Martin‐Neto, Ladislau

doi:10.1016/j.sab.2008.09.003

Cited by 44 publications

(33 citation statements)

References 21 publications

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“…For instance, the C emission line found at 247.86 nm was assessed in various LIBS soil studies, due to its high intensity [6] [7] [13]; however, as tropical soils have large amounts of Fe in their compositions, this Fe (II) line was found to strongly interfere with one of the C spectral lines. For this reason, we chose to assess the C line at 193.03 nm, which was also previously studied by our group [8] [15].…”

Section: Resultsmentioning

confidence: 99%

“…This low correlation is attributed to Al interference, since the C emission line at 193.03 nm suffers from subtle interference from Al lines. However, the intensity of the line at 193.58 nm was used for Previous papers by our group [8] [15] have shown methodologies for spectral correction, where Al interference was removed. However, in the present study we are suggesting a simpler method, with additional soil sampling, focusing on field analysis.…”

Section: Resultsmentioning

confidence: 99%

“…However, LIBS has some precision limitations with regard to variation in the physical and chemical properties of the different materials present in soil, known as matrix effects [12] [14] [16]. After these limitations have been solved and the system has been calibrated using samples with known concentrations of an element of interest, LIBS has been used for determining metals, minerals, C and other important elements in soil [11] [12]; therefore, there is great potential for the development of portable LIBS equipment for the field-based quantification of C in soil [8] [17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Segnini¹,

Xavier²,

Otaviani-Junior³

et al. 2014

AJAC

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Advanced field methods of carbon (C) analysis should now be capable of providing repetitive, sequential measurements for the evaluation of spatial and temporal variation at a scale that was previously unfeasible. Some spectroscopy techniques, such as laser-induced breakdown spectroscopy (LIBS), have portable features that may potentially lead to clean and rapid alternative approaches for this purpose. The goal of this study was to quantify the C content of soils with different textures and with high iron and aluminum concentrations using LIBS. LIBS emission spectra from soil pellets were captured, and the C content was estimated (emission line of C (I) at 193.03 nm) after spectral offset and aluminum spectral interference correction. This technique is highly portable and could be ideal for providing the soil C content in a heterogeneous experiment. Dry combustion was used as a reference method, and for calibration a conventional linear model was evaluated based on soil textural classes. The correlation between reference and LIBS values showed r = 0.86 for medium-textured soils and r = 0.93 for fine-textured soils. The data showed that better correlation and lower error (14%) values were found for the fine-textured LIBS model. The limit of detection (LOD) was found to be 0.32% for medium-textured soils and 0.13% for finetextured soils. The results indicated that LIBS quantification can be affected by the texture and chemical composition of soil. Signal treatment was shown to be very important for mitigation of these interferences and to improve quantification.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Segnini¹,

Xavier²,

Otaviani-Junior³

et al. 2014

AJAC

View full text Add to dashboard Cite

show abstract

“…PLS has been implemented either to calculate the concentrations of a single element (PLS-1) or to simultaneously calculate the concentrations of more than one element (PLS-2). In addition to PLS, other linear (MLR [84,85], PCR [50,73] and LASSO [75][76][77]) and nonlinear regression methods (ANN [86,87]) have been applied to LIBS quantitative analysis. In order to discern the most effective models for interpreting chemical abundances from LIBS spectra of geological samples, Boucher et al [77] had studied nine kinds of linear and nonlinear regression methods.…”

Section: The Comparison Of Calibration Methodsmentioning

confidence: 99%

Calibration Methods of Laser-Induced Breakdown Spectroscopy

Fu¹,

Jia²,

Wang³

et al. 2018

Calibration and Validation of Analytical Methods - A Sampling of Current Approaches

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Laser-induced breakdown spectroscopy (LIBS) has gained great attention over the past two decades due to its many advantages, such as needless sample preparation, capability of remote measurement and fast multielement simultaneous analysis. However, because of its inherent uncertainty features of plasma, it is still a big challenge for LIBS community worldwide to realize high sensitivity and accurate quantitative analysis. Currently, many chemometric analytical methods have been applied to LIBS calibration analysis, including univariate regression, multivariate regression, principal component regression (PCR), partial least squares regression (PLSR) and so on. In addition, appropriate sample and spectral pretreatment can effectively improve the analytical performance (i.e., limit of detection (LOD), accuracy and repeatability) of LIBS. In this chapter, we briefly summarize the progress of these calibration methods and their applications on LIBS and provide our recommendations.

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“…Hence, quantification of soil carbon in field conditions has a significant challenge corresponding to global climatic changes and the carbon cycle. Recently, Da Silva et al [6] succeeded in calibrating a portable LIBS system to execute quantitative measurements of carbon content in a tropical soil sample. Even though their LIBS system was used for qualitative elemental analyses with no prior sample treatment, the results were obtained directly.…”

Section: Introductionmentioning

confidence: 99%

Qualitative Analysis and Plasma Characteristics of Soil from a Desert Area using LIBS Technique

Farooq¹,

Tawfik²,

Al-Mutairi³

et al. 2013

Journal of the Optical Society of Korea

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In this work, laser induced breakdown spectroscopy (LIBS) is used to investigate soil samples collected from different desert areas of Riyadh city in Saudi Arabia. Both qualitative analysis and plasma parameters are studied via the observed LIBS spectra. These experiments have been done using a Spectrolaser-7000 system with 50 mJ fundamental wavelength of Nd:YAG laser and detection delay time of 1 microsecond. Many spectral lines are highly resolved for many elements like Al, Fe, Mg, Si, Mn, Na, Ca and K. The electron temperatures Te and electron densities Ne, for the constituent of generated LIBS plasma, are determined for all the collected samples. It is found that both Te and Ne vary from one desert area to other. This variation is due to the change of the elemental concentration in different desert areas that affects the sample's matrices. Time dependent measurements have also been performed on the soil samples. While the signal-to-base ratio (SBR) reached its optimal value at 1 microsecond, the plasma parameters Ne and Te reach values of 4×10 17 cm -3 and 9235 K, respectively, at 2.5 microsecond. The later indicate that the plasma cooling processes are slow in comparison to the previously observed results for metallic samples.The observed results show also that in the future it is possible to enhance the exploitation of LIBS in the remote on-line environmental monitoring application, by following up only the values of Ne and Te for one element of the soil desert sample using an optical fiber probe.

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Total carbon measurement in whole tropical soil sample

Cited by 44 publications

References 21 publications

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Physical and Chemical Matrix Effects in Soil Carbon Quantification Using Laser-Induced Breakdown Spectroscopy

Calibration Methods of Laser-Induced Breakdown Spectroscopy

Qualitative Analysis and Plasma Characteristics of Soil from a Desert Area using LIBS Technique

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