Detection of chemical elements related to impurities leached from raw sugarcane: Use of laser-induced breakdown spectroscopy (LIBS) and chemometrics

Andrade, Daniel Fernandes; Guedes, Wesley Nascimento; Pereira, Fernando Mendes

doi:10.1016/j.microc.2017.12.005

Cited by 24 publications

(13 citation statements)

References 17 publications

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“…These emission lines are expected because the original chemical composition of polyethylene is formed only by these elements. This information is corroborated by the molecular bands of C 17 and 499.10 nm) were observed. These chemical elements are added to polyethylene as additives during the polymerization process to improve the properties of these materials.…”

Section: General Characteristics Of Libs Spectrasupporting

confidence: 68%

“…[12][13][14] These advantages make LIBS one of the most versatile techniques already developed in several areas. [15][16][17] In relation to the theme of LIBS and plastics, some research groups are working successfully to identify these materials using LIBS. [18][19][20] The first publication involving the theme was reported in 1998, 21 and since then, about 70 publications can be found according to the Web of Science database.…”

Section: Introductionmentioning

confidence: 99%

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Laser‐induced breakdown spectroscopy applied to the rapid identification of different types of polyethylene used for toy manufacturing

Costa

Pereira

2020

Journal of Chemometrics

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The identification of plastics is of great importance to recycling companies, as the littering of plastic wastes has rapidly increased because of the extensive use of plastics. To maintain the economics of recycling extremely large volumes of waste materials, rapid and accurate identification of these plastics is crucial. In this study, we demonstrate the efficacy of laser-induced breakdown spectroscopy (LIBS) in the rapid identification of high-density polyethylene (HDPE) and low-density polyethylene (LDPE) used for toy manufacturing. For data analysis of the LIBS spectra, multivariate data analysis using principal component analysis (PCA) was utilized. The analyses of the data clearly showed that the elemental and molecular information obtained from LIBS is effective in the identification of three types of polyethylene. The proposed method was successfully applied and can be used as an alternative to the traditional methods used for analyses of plastics.

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Section: General Characteristics Of Libs Spectrasupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Laser‐induced breakdown spectroscopy applied to the rapid identification of different types of polyethylene used for toy manufacturing

Costa

Pereira

2020

Journal of Chemometrics

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“…After heating for 2 h at 50°C in an oven, an immobilized sample in solid PVA (leachate) was obtained. The resulting 60 immobilized samples presented thin and plain polymer films suitable for LIBS technique direct analysis [19].…”

Section: Samplesmentioning

confidence: 99%

“…The leachates were measured using a LIBS instrument with a 1064 nm Q-switched Nd:YAG laser (Applied Spectra, Fremont, CA, USA) [19]. The number of independent variables for each spectrum was 12,288 with a resolution between 0.06 and 0.12 nm for the 6-channel charge-coupled device (CCD) spectrometer with a spectral window ranging from 186 to 1042 nm.…”

Section: Libs Datasetmentioning

confidence: 99%

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Classifying impurity ranges in raw sugarcane using laser-induced breakdown spectroscopy (LIBS) and sum fusion across a tuning parameter window

Guedes

Pereira

2018

Microchemical Journal

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The presence in raw sugarcane of low levels of solid impurities from soil particles and green and dry/brown sugarcane leaves is relevant to improving sugar mill production performance. Two ranges of impurities for raw sugar manufacturing processes need to be characterized from 0 to 5 wt% (desired material) and 8 to 10 wt% (undesired material); these ranges are denoted as 1 and 2, respectively. Laser-induced breakdown spectroscopy (LIBS) combined with chemometrics is used to detect chemical elements and different impurity ranges in leached raw sugarcane solutions. The potential use of LIBS based on leached solutions immobilized in a polyvinyl alcohol (PVA) polymer requires approximately 2 h sample preparation time. LIBS data are assigned to the above two impurity ranges using fusion of multiple classifiers. Most classifiers require a training set and optimization of a tuning parameter to select the best model; however, the sum fusion across a tuning parameter window used for classifying the samples in this study is a process that does not require either. The classification results are 97% accuracy for both ranges; 94% and 100% specificity for ranges 1 and 2, respectively; and 100% and 94% sensitivity for ranges 1 and 2, respectively. The classification results indicate potential for future applications in sugarcane refineries.

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Differentiation of Different Sorts of Sugars by the CAPoNeF Method

et al. 2021

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The proposed method as CAPoNeF (Comparative Analysis of Positive and Negative Fluctuations) allows to "read" any trendless sequence quantitatively irrespective of the imposed model and treatment errors that inevitably accompany random sequence. This method will have a wide possibility because of its generality and simplicity in possible applications. In particular, the proposed strategy makes it possible to detect weak signals in the time electrochemical series caused by the presence of random micro-impurities in the studied solutions as objects of analysis. On the example of the current-voltage time series of sugar syrups of various manufacturers, the possibility of identifying numerical parameters is shown. Hidden in the noise, analytical signals can be used to express the similarity or difference between sugars from different manufacturers.

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Detection of chemical elements related to impurities leached from raw sugarcane: Use of laser-induced breakdown spectroscopy (LIBS) and chemometrics

Cited by 24 publications

References 17 publications

Laser‐induced breakdown spectroscopy applied to the rapid identification of different types of polyethylene used for toy manufacturing

Laser‐induced breakdown spectroscopy applied to the rapid identification of different types of polyethylene used for toy manufacturing

Classifying impurity ranges in raw sugarcane using laser-induced breakdown spectroscopy (LIBS) and sum fusion across a tuning parameter window

Differentiation of Different Sorts of Sugars by the CAPoNeF Method

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