Spectrochemical analysis of Pakistani bakery breads using laser induced breakdown spectroscopy

Ahmed, Naveed; Farooq, Komal; Shahida, Shabnam; Haq, Khizar ul; Abbasi, Shahab Ahmed; Umar, Zeshan Adeel; Ahmed, Rizwan; Baig, M. A.

doi:10.1016/j.ijleo.2020.165743

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…The spectrum is comprised of ten Si-I and four Si-II lines, thirteen Al-I and six Al-II lines, fifteen N-I and five N-II lines, three O-I and a single line of each H, F-I and Na-I, and gives a clear manifestation of the chemical composition of topaz. For the laser ablation in the ambient air, there is a great possibility for nitrogen in the spectra, as observed previously using the same spectrometer [49]. The possible reasons for the Na line in the spectra at a higher laser fluence value of 37.6 J•cm −2 could be either due to; (i) small impurities in topaz crystals or (ii) contamination from human touch and experimental atmosphere.…”

Section: Qualitative Analysissupporting

confidence: 55%

Chemical Analysis of Thermoluminescent Colorless Topaz Crystal Using Laser-Induced Breakdown Spectroscopy

et al. 2021

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We present results of calibration-free laser-induced breakdown spectroscopy (CF-LIBS) and energy-dispersive X-ray (EDX) analysis of natural colorless topaz crystal of local Pakistani origin. Topaz plasma was produced in the ambient air using a nanosecond laser pulse of width 5 ns and wavelength 532 nm. For the purpose of detection of maximum possible constituent elements within the Topaz sample, the laser fluences were varied, ranging 19.6–37.6 J·cm−2 and optical emission from the plasma was recorded within the spectral range of 250–870 nm. The spectrum obtained has shown the presence of seven elements viz. Al, Si, F, O, H, Na and N. Results shows that the fluorine was detected at laser fluence higher than 35 J·cm−2 and plasma temperature of >1 eV. Al and Si were found as the major compositional elements in topaz crystals. The ratios of concentrations of Al and Si were found as 1.55 and 1.59 estimated by CF-LIBS and EDX, respectively. Furthermore, no impurity was found in the investigated colorless topaz samples.

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Section: Qualitative Analysissupporting

confidence: 55%

Chemical Analysis of Thermoluminescent Colorless Topaz Crystal Using Laser-Induced Breakdown Spectroscopy

et al. 2021

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“…The experimental arrangement for this study is also described elsewhere in detail [ 35 , 36 , 37 ]. In short, a plasma plume was generated on the sample surface by focusing a laser beam originating from a Q-switched Nd.YAG laser (Brilliant, Quintal, Les Ulis CEDEX, France).…”

Section: Methodsmentioning

confidence: 99%

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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“…Experimental configurations used in this research work were the same as discussed in detail in our previous papers [25][26][27][28][29]. In brief; for the formation of plasma, the focused laser falls on the target material, this laser pulse energy vaporizes the material and produces plasma on its surface.…”

Section: Methodsmentioning

confidence: 99%

Detection of toxic and trace elements in the environmental samples around an indigenous refinery in Pakistan using LIBS

et al. 2021

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Elemental profiling of oil sludge and nearby soil is an essential task because these samples -are prone to contain toxic elements which can cause hazardous effects. Therefore, these samples must be analyzed to control the environmental pollution. This paper focuses on the elemental profiling including toxic metals of oil sludge and nearby cultivated soil samples collected from the Attock Refinery Limited Rawalpindi, Pakistan by using laser induced breakdown spectroscopy. The laser beam of a 1064 nm wavelength from a nanosecond Q-switched Nd:YAG laser was focused on the surface of the sample, and an emission spectrum was obtained with the help of a LIBS2000 spectrometer covering the spectral range between 200 and 700 nm. Results obtained through analyzing the characteristic emission lines of different elements have confirmed the presence of 18 elements in oil sludge and 15 elements in the soil. For quantification of the detected elements, a calibration-free method based on local thermodynamic equilibrium and an optically thin plasma model was employed. Plasma parameters, such as electron number density and temperature were calculated for the purpose of subsequent calculations. The concentration of the detected elements in terms of weight percentage in oil sludge was 1.3% Al,

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Spectrochemical analysis of Pakistani bakery breads using laser induced breakdown spectroscopy

Cited by 11 publications

References 27 publications

Chemical Analysis of Thermoluminescent Colorless Topaz Crystal Using Laser-Induced Breakdown Spectroscopy

Chemical Analysis of Thermoluminescent Colorless Topaz Crystal Using Laser-Induced Breakdown Spectroscopy

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

Detection of toxic and trace elements in the environmental samples around an indigenous refinery in Pakistan using LIBS

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