Effects of experimental parameters on elemental analysis of coal by laser-induced breakdown spectroscopy

Li, Jie; Lü, Jidong; Lin, Zhihong; Gong, Shunsheng; Xie, Chengli; Chang, Liang; Yang, Lifei; Li, Pengyan

doi:10.1016/j.optlastec.2009.03.003

Cited by 85 publications

(41 citation statements)

References 24 publications

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“…In addition, all the coal samples used were air-dried. Other studies have improved the accuracy or precision of quantitative analysis for coal samples, including experimental parameter optimization [8], sample preparation progress [9] and data processing methods [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effects of moisture content on coal analysis using laser-induced breakdown spectroscopy

Chen

Yuan

Hou

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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Laser-induced breakdown spectroscopy (LIBS) is regarded as a very promising technique for fast or online coal analysis. However, the analytical performance is greatly influenced by its moisture content. In the present work, the effects of moisture content variations on the properties of the laser-induced plasma and its spectral signals were investigated using the same coal samples mixed with different moisture contents. Plasma morphology and spatially resolved spectra were also obtained to further investigate the effects, and the mechanism of the effects was also discussed. Results showed that most of the spectral line intensities decreased as the moisture content increased, even including those of H and O. Seen from the spatially resolved spectra, the profile of H intensity over the height of plasma showed a higher peak position with increasing moisture content, and the height of the peak of the H intensity profile was slightly higher than those of other elements such as C and Al. The laser ablation process and mechanism underlying the effects of moisture content were proposed as following: part of the moisture was evaporated first under laser radiation and ablated earlier than those of other coal materials. Consequently, the outside layer of the laser-induced plasma was mostly from the dissociation of moisture. Given the earlier evaporation of moisture, part of the energy was used to dissociate and ionize the surrounding water vapor or even reflected by the splashed particle caused by fast expanding moisture, thereby shielding the further absorption of laser energy to the solid coal material. This phenomenon resulted in less coal mass being actually ablated into the plasma with increasing moisture content, hence emitting smaller line intensities. On the other hand, the decrease in H line intensity may be caused by the fact that these elements were pushed to the outside cooler layer.

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Section: Introductionmentioning

confidence: 99%

Effects of moisture content on coal analysis using laser-induced breakdown spectroscopy

Chen

Yuan

Hou

et al. 2015

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…This study demonstrates the use of laserinduced breakdown spectroscopy (LIBS) [15], a spectroscopic technique to investigate the sources of variability in coating uniformity in tablets and which attempts to establish statistical significance, or lack thereof, of the possible causes. The LIBS technique finds application in a wide variety of areas such as the study of soil composition [16], polymers [17], minerals [18], metallic compounds [19,20], cosmetics [21], gaseous mixtures [22], construction materials [23], hazardous material detection [24], and traditional fuels such as coal [25], fuel cells [26], and biological tissues [27,28]. The pharmaceutical industry is beginning to consider this technique for in-line monitoring and product analysis applications.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pharmaceutical Tablet Coating Uniformity by Laser-Induced Breakdown Spectroscopy (LIBS)

et al. 2011

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A laser-induced breakdown spectroscopy-based analytical methodology is developed to study tablet coating variability in pharmaceutical tablets. The method quantifies the amount of coating on a tablet by assigning an average coating thickness score to it. When tested using samples with different amounts of coating, the coating thickness scores showed direct correlation to the weight gain of the tablet, hence validating the analytical method. The relative significance of the processing parameters and the components of variability were computed using statistical techniques. The sampling frequency of laser shots was found to have no significant effect. The effect of the position of the laser pulse on the tablet surface was found to be significant; however, it was determined that this effect was due to the tablet curvature, which resulted in the laser optical path to intersect the coating diagonally. The variability between batches (lots) manufactured under the same processing conditions was not significant. The largest avoidable source of variability was the tablet-to-tablet component, possibly indicating the inadequate mixing performance of the coating device.

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“…This information is in the form of emission lines, at specific wavelengths characteristic to the analyte [18]. In this work, all spectra were recorded by accumulating 20 successive laser shots on the target surface.…”

Section: Spectral Analysis and Quantification Of Cr In Soilmentioning

confidence: 99%

“…The LIBS technique has been applied for direct analysis of different environmental samples [5,[13][14][15][16][17][18][19][20][21]. The principles of LIBS have been described elsewhere [13,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown spectroscopy and inductively coupled plasma-mass spectrometry for determination of Cr in soils from Brits District, South Africa

Ambushe¹,

Plessis²,

McCrindle³

2015

Bull. Chem. Soc. Eth.

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ABSTRACT. Laser-induced breakdown spectroscopy (LIBS) is an emerging analytical technique, which can be used to perform elemental analysis of any material, irrespective of its physical state. In this study, the LIBS technique has been applied for quantification of total Cr in soil samples collected from polluted areas of Brits, North West Province, South Africa. A Q-switched neodymium-yttrium aluminium garnet (Nd-YAG) laser (10 Hz, λ = 1064 nm) was employed for generation of a laser-induced plasma on the surface of the soil sample. The atomic emission lines were recorded using an Andor Shamrock SR-303i spectrometer, fitted with an intensified charge-coupled device (ICCD) camera. Detailed investigation of experimental parameters such as gate delay time, gate width and laser pulse energy was conducted. Soil samples were dried, finely ground, sieved and thereafter pelletized before LIBS analysis. Calibration curve for the quantification of Cr was constructed using certified reference materials of soils and sediments. The concentrations of Cr in soil samples varied from 111 to 3180 mg/kg. In order to test the validity of the LIBS results, inductively coupled plasma-mass spectrometry (ICP-MS) was also employed for determination of Cr. The results obtained using LIBS were found to be in good agreement with those of ICP-MS.

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Effects of experimental parameters on elemental analysis of coal by laser-induced breakdown spectroscopy

Cited by 85 publications

References 24 publications

Effects of moisture content on coal analysis using laser-induced breakdown spectroscopy

Effects of moisture content on coal analysis using laser-induced breakdown spectroscopy

Analysis of Pharmaceutical Tablet Coating Uniformity by Laser-Induced Breakdown Spectroscopy (LIBS)

Laser-induced breakdown spectroscopy and inductively coupled plasma-mass spectrometry for determination of Cr in soils from Brits District, South Africa

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