Quantification of elemental composition of Granite Gneiss collected from Neelum Valley using calibration free laser-induced breakdown and energy-dispersive X-ray spectroscopy

Abbasi, Shahab Ahmed; Rafique, Muhammad; Mir, Altaf Ahmad; Kearfott, Kimberlee J.; Khan, Salah Ud‐Din; Khan, Shahab Ud‐Din; Khan, Taj Muhammad; Iqbal, Javed

doi:10.1080/16878507.2020.1739801

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…It is evident from Table 5 that the percentage error between the measurements of CF-LIBS and XRF techniques range from almost 8% to 18% for major elements (Ti, W, Fe), whereas for minor and trace elements, relative error increases from

17% to

88%. These results are consistent with many previous studies suggesting that CF-LIBS performs almost equivalently well for quantifying major elements in a multi-elemental material, but its efficiency reduces for minor and trace element quantification [ 25 , 26 , 27 , 28 , 29 , 30 ]. However, the advantage of LIBS over XRF is the detection of lighter elements in multi-elemental complex materials.…”

Section: Discussionsupporting

confidence: 92%

“…Being free from the matrix effect, CF-LIBS methodology emerges as an effective alternative and gives reasonable and good quantitative results for geological materials of unknown composition. In previous studies, quantitative results obtained with CF-LIBS showed a reasonable agreement with standard analytical techniques [ 26 , 27 , 28 , 29 , 30 ]. There is no need for reference samples and drawing the calibration curves for each element present in the target sample.…”

Section: Discussionsupporting

confidence: 70%

“…This methodology is preferred over the calibration method because it eliminates the matrix effect and requires no reference sample. CF-LIBS technique has been successfully employed for compositional analysis of various types of ores and minerals such as quartz, limestone and granite gneiss [ 26 , 27 , 28 ]. Concentration of Cu along with other elements has been successfully measured using CF-LIBS method in copper-rich minerals such as malachite and chalcopyrite [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

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Detection and Quantification of Precious Elements in Astrophyllite Mineral by Optical Spectroscopy

et al. 2021

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With many advantages over well-established methods, laser induced breakdown spectroscopy (LIBS) has emerged as a useful analytical technique for the compositional analysis of multi-elemental geological materials. In this study, LIBS was employed for qualitative and quantitative analysis of a rare mineral, astrophyllite, bearing precious elements of industrial and technological interest. The experiment was carried out using second harmonic generation of Nd:YAG laser of pulse width 5 ns and repetition rate of 10 Hz. Microplasma was produced by focusing laser beam on an astrophyllite target, and optical emissions from the generated plasma were recorded in the spectral range of 200–720 nm with the help of a LIBS2000+ detection system. On analyzing the optical spectra, existence of 15 elements in astrophyllite target were revealed. These elements include: Ti, W, Ag, Al, Ba, Ca, Cr, Cu, Fe, Li, Mg, Na, Ni, Si and H. For quantification, calibration-free method was used. Only ten elements, namely Ti, W, Fe, Cr, Cu, Ca, Mg, Ni, Si and Al, were quantified with relative weight concentrations of 55.39%, 18.79%, 18.30%, 4.05%, 2.66, 0.43%, 0.18%, 0.12%, 0.06% and 0.02%, respectively. To benchmark these results, XRF analysis was performed, which confirmed the presence of all the elements detected in the optical spectrum of the sample, except for Na, Li, and H. The concentrations of these ten elements as measured by XRF were in reasonable agreement, especially for the major elements. The presence of a significant amount of Ti and W in an astrophyllite sample, found in Pakistan, highlights the economic value of this mineral. This study may be of further interest in commissioning LIBS technology for exploration of minerals in the region.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

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Detection and Quantification of Precious Elements in Astrophyllite Mineral by Optical Spectroscopy

et al. 2021

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“…In this scenario, the CF-LIBS method appears to be a suitable and effective alternative to the calibration method. In some previous studies, the CF-LIBS method was utilized for measurement of elemental composition of geological samples such as limestone, granite, malachite, and nephrite, and results were compared with standard techniques such as energy dispersive X-ray spectroscopy (EDX), X-ray fluorescence (XRF), and laser ablation-time of flight-mass spectrometer (LA-TOF-MS) [24][25][26]44,45]. In all of these studies, quantitative results obtained with CF-LIBS showed reasonable agreement with the standard analytical techniques.…”

Section: Discussionmentioning

confidence: 99%

Compositional Analysis of Chalcopyrite Using Calibration-Free Laser-Induced Breakdown Spectroscopy

et al. 2020

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This article presents elemental analysis of an economically important mineral (chalcopyrite) of local origin. Calibration-free laser-induced breakdown spectroscopy (CF-LIBS) methodology based on the assumption of optically thin plasma and local thermodynamic equilibrium was employed for quantitative analysis. Plasma on the surface of the chalcopyrite target was generated by an Nd:YAG laser beam of wavelength 532 nm, pulse width 5 ns, and operated at repetition rate of 10 Hz. A LIBS2000+ detection system, comprised of five spectrometers, covering the spectral range from 200–720 nm, was used to record the signal of the optical emission from the chalcopyrite plasma. Recorded optical spectrum revealed the presence of Cu and Fe as the major elements while Ca and Na were recognized as the minor elements in the target sample. Quantitative analysis has shown that the relative concentrations of Cu, Fe, and Ca in the sample under study were 58.9%, 40.2%, and 0.9% by weight respectively. However, Na was not quantified due to the unavailability of suitable spectral lines, required for CF-LIBS analysis. Results obtained by CF-LIBS were validated by X-ray fluorescence (XRF) analysis, which showed the presence of five compositional elements viz. Cu, Fe, Si, Se and Ag with weight percentages of 58.1%, 35.4%, 5.7%, 0.7%, and 0.1% respectively. These results endorse the effectiveness of the CF-LIBS technique for quantitative analysis of major elements, however, its usefulness in case of minor and trace elements needs further improvement.

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“…Harmon et al found out that the dispersion of CNT's in polymer (Poly Methyl Methacrylate) may lessen the degradation of properties with gamma irradiation and concluded that the SWNTs can dissipate the energy by ionizing radiations. Improvement in radiation resistance can also be achieved by incorporating the aromatic compounds into a polymer, either within the structure or as an additive (Abbasi et al, 2020;Hales et al, 2015;Khan et al, 2018;Phillpot et al, 2018;Zhu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Development of theoretical-computational model for radiation shielding

Khan

Khan²,

Almutairi

et al. 2020

Journal of Radiation Research and Applied Sciences

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Development of materials for radiation shielding application, which are lightweight, flexible, and robust increases in demand for nuclear radiation facilities including industrial or medical applications. In this paper, three metals (lead, gadolinium, bismuth) doped polymeric compounds (poly-acrylonitrile, polyethylene, and kevlar) were simulated by using theoretical and computational model. It was assumed that lead, gadolinium and bismuth were dispersed homogenously. Both theoretical and computational model were used to calculate the attenuation coefficients of these composite polymeric compounds. At first, theoretical calculations were performed and then computational models were used to simulate the irradiation of the polymeric compounds under various photon energy sources. For each compound, attenuation coefficients were calculated under different percentages and then compared with two computational programs. The work attains novelty as no work is ever reported on the metal/ polymeric composites for radiation shielding applications by theoretical-computational technique. This approach was used for the material selection and estimating the possibility of error and to calculate attenuation coefficients under various radiation doses. The research opens new grounds for developing radiation-shielding materials by computational techniques.

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Quantification of elemental composition of Granite Gneiss collected from Neelum Valley using calibration free laser-induced breakdown and energy-dispersive X-ray spectroscopy

Cited by 10 publications

References 34 publications

Detection and Quantification of Precious Elements in Astrophyllite Mineral by Optical Spectroscopy

Detection and Quantification of Precious Elements in Astrophyllite Mineral by Optical Spectroscopy

Compositional Analysis of Chalcopyrite Using Calibration-Free Laser-Induced Breakdown Spectroscopy

Development of theoretical-computational model for radiation shielding

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