Developed Method for Spectroscopic Studies of Viscous Samples

Shaltout, Abdallah A.; Seoudi, R.; EL-ashkar, Emad; Eid, K. A.

doi:10.1080/00032710802463907

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…The observed difference in cross-sectional profile was considered to be due to the viscosity changes between these two concentrations. The viscosity of 40% (≈3.8) H 3 PO 4 is about three times greater than that of the 10% (≈1.3) etchant [ 22 , 23 ], which may significantly the influence on the etchant flow inside a narrow groove. For the thermochemical reaction to be sustained, fresh etchant should be continuously supplied into the groove.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Cross-Sectional Shape of μ–Grooves Produced in Stainless Steel 304 by Laser-Induced Etching Technique

Kim¹,

Oh²

2021

Micromachines

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The variation in cross-sectional profile of a microgroove fabricated with focused and diverging laser irradiation is demonstrated with ray tracing. To verify the result of ray tracing, stainless-steel 304 microgrooves were manufactured utilizing the conventional lens-based and optical fiber-based laser-induced etching techniques in phosphoric acid solution. Three distinctive groove geometries, i.e., a flat surface with no groove, an intermediate stage groove, and a fully developed V-groove, were rendered for numerical analysis. For focusing mode, the first and second reflections were caused by high laser intensity and the second reflected beam could lead to variation in the groove shape such as a U-shaped groove or a V-shaped groove in accordance with etchant concentration. On the contrary, a weak laser entirely distributed at the groove sidewall could not induce a chemical reaction, leading to a V-shaped groove. The effect of process variables such as laser power (intensity) and etchant concentration on the cross-sectional profiles of a groove are closely examined through the computed simulation results.

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Section: Resultsmentioning

confidence: 99%

Evaluation of the Cross-Sectional Shape of μ–Grooves Produced in Stainless Steel 304 by Laser-Induced Etching Technique

Kim¹,

Oh²

2021

Micromachines

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“…For elemental quantitative analysis of the extracted essential oils, 5 μl of the oil from the total sample volume (~1 ml) and 5 μl of 0.1 mg L −1 of Ga solution were deposited on siliconized quartz reflectors and dried on a hot plate at 50°C for 2–3 weeks depending on the drying time. The long evaporation time of the essential oil droplet is primarily due to its high viscosity, whereas the direct analysis of the viscous sample is a challenge . The Ga was used as an internal standard to calculate the concentration of elements of interest using the following equation:

C_{i} = \frac{C_{IS} N_{i}}{N_{IS} S_{i}}

where C i is the concentration of the analyte, C IS is the concentration of the internal standard, N i is the net area of the analyte peak, N IS is the net area of the internal standard element, and Si is the relative sensitivity of the analyte.…”

Section: Methodsmentioning

confidence: 99%

Direct analysis of essential oils by means of TXRF spectrometry

et al. 2019

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Direct analysis of essential oil has been performed for estimation of the elemental content in five different extracted essential oils from the leaves of different plants, namely, Mentha longifolia, Rosmarinus officinalis, Ocimum basilicum, Elletaria cardamomum, and Lavandula hybrida. A benchtop total reflection X-ray fluorescence spectrometer with a maximum power of 40 W was used for this purpose. Fourteen elements have been quantified in most of the extracted essential oil samples, and their limits of detection were determined. The detected elements are P, S, Cl, K, Ca, Cr, Mn, Fe, Ni, Cu, Zn, As, Br, Ni, and Hf. The validity of the present method was demonstrated using a standard reference material of organometallic oil sample. Two extraction methods of essential oils from leaves of the mentioned plants are evaluated, namely, classical hydro-distillation and microwave-assisted hydro-distillation. The quantitative elemental analysis of the extracted essential oils using the two extracted methods was studied and compared.

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“…It was mentioned that the number of vehicles in Jeddah city reached 1.5 Million [32]. In addition, PGE and its compositions are usually used as a chemical modifier in graphite furnace atomic absorption spectrometry [33][34][35][36][37][38], which may increase the concentration of PGE in the ambient air.…”

Section: Comparison With Published Datamentioning

confidence: 99%

Spectroscopic Assessment of Platinum Group Elements of PM10 Particles Sampled in Three Different Areas in Jeddah, Saudi Arabia

Kadi

Ismail

Ali

et al. 2020

IJERPH

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Platinum group elements (PGE) including Ru, Rh, Pt and Pd have been quantified in air particulate matter with an aerodynamic diameter equal or less than 10 microns (PM10) using inductively coupled plasma mass spectrometry (ICP-MS). PM10 aerosols have been collected from three sites representing various activities in Jeddah city, Saudi Arabia. These locations are residential site with heavy traffic, industrial site and heavy traffic and a light traffic site outside the city. To obtain reasonable data of the PGE concentrations, a group from 10 to 15 PM10 samples were collected every month. The annual and seasonal variation of the mass concentration of the PGE were demonstrated. In all locations, Pt and Pd were relatively higher than Ru and Rh possibly because their main use is in automobile catalytic converters. Concentrations of observed PGE in PM10 could be arranged in ascending order as: Rh < Ru < Pd < Pt. In case of Ru and Pt, there are clear similarities in terms of the overall mean concentrations at the sampling locations. Due to the high concentration of Ru, Rh and Pd at low traffic site, there are certainly other sources of these elements rather than vehicle catalytic converters. However, at the industrial/heavy traffic location, high concentrations of Ru were detected during February 2015. In addition, high Pt concentrations were also detected at the light traffic site during May 2015. Results indicate that Pt source in PM10 is mainly the automobile catalytic converters.

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Developed Method for Spectroscopic Studies of Viscous Samples

Cited by 6 publications

References 26 publications

Evaluation of the Cross-Sectional Shape of μ–Grooves Produced in Stainless Steel 304 by Laser-Induced Etching Technique

Evaluation of the Cross-Sectional Shape of μ–Grooves Produced in Stainless Steel 304 by Laser-Induced Etching Technique

Direct analysis of essential oils by means of TXRF spectrometry

Spectroscopic Assessment of Platinum Group Elements of PM10 Particles Sampled in Three Different Areas in Jeddah, Saudi Arabia

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