Shift of ionization equilibrium in spatially confined laser induced plasma

2019 ◽  
Vol 34 (10) ◽  
pp. 1975-1981 ◽  
Author(s):  
Aleksandr S. Zakuskin ◽  
Andrey M. Popov ◽  
Timur A. Labutin
Keyword(s):  
Ionization Equilibrium ◽  
Spatial Confinement ◽  
Laser Induced Plasma ◽  
Atomic Lines ◽  
Improve Determination

Spatial confinement of laser-induced plasma leads to shift of ionization equilibrium and can improve determination of elements by their resonant atomic lines.

scholarly journals Element dependence of enhancement in optics emission from laser-induced plasma under spatial confinement

2014 ◽  
Vol 29 (4) ◽  
pp. 638 ◽  
Author(s):  
Changmao Li ◽  
Lianbo Guo ◽  
Xiangnan He ◽  
Zhongqi Hao ◽  
Xiangyou Li ◽  
...  
Keyword(s):  
Spatial Confinement ◽  
Laser Induced Plasma

Optimization of distances between the target surface and focal point on spatially confined laser-induced breakdown spectroscopy with a cylindrical cavity

2017 ◽  
Vol 32 (2) ◽  
pp. 367-372 ◽  
Author(s):  
Jin Guo ◽  
Junfeng Shao ◽  
Tingfeng Wang ◽  
Changbin Zheng ◽  
Anmin Chen ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Focal Point ◽  
Optical Emission ◽  
Target Surface ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spatial Confinement ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The spatial confinement effect in laser-induced plasma with different distances between the target surface and focal point is investigated by optical emission spectroscopy.

scholarly journals Exploring potentialities of the HR-CS FAAS technique in the determination of Ni and Pb in mineral waters

2008 ◽  
Vol 33 (1) ◽  
pp. 49-56 ◽  
Author(s):  
V. R.. Amorim Filho ◽  
V. P. Franzini ◽  
J. A. Gomes Neto
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Natural Waters ◽  
Absorption Spectrometry ◽  
Mineral Waters ◽  
Continuum Source ◽  
Flame Atomic Absorption ◽  
Atomic Lines

National Health Surveillance Agency (ANVISA) established in the decree number 54 maximum allowed levels for Ni and Pb in mineral and natural waters at 20 µg L-1 and 10 µg L-1, respectively. For screening analysis purposes, the high-resolution continuum source flame atomic absorption spectrometry technique (HR-CS FAAS) was evaluated for the fast-sequential determination of nickel and lead in mineral waters.Two atomic lines for Ni (232.003 nm - main and 341.477 nm - secondary) and Pb (217.0005 nm - main and 283.306 nm - secondary) at different wavelength integrated absorbance (number of pixels) were evaluated. Sensitivity enhanced with the increase of the number of pixels and with the summation of the atomic lines absorbances. The main figures of merit associated to the HR-CS FAAS technique were compared with that obtained by line-source flame atomic absorption spectrometry (LS FAAS). Water samples were pre-concentrated about 5-fold by evaporation before analysis. Recoveries of Pb significantly varied with increased wavelength integrated absorbance. Better recoveries (92-93%) were observed for higher number of pixels at the main line or summating the atomic lines (90-92%). This influence was irrelevant for Ni, and recoveries in the 92-104% range were obtained in all situations.

Determination of antimony concentrations in widely used plastic objects by laser induced breakdown spectroscopy (LIBS)

2018 ◽  
Vol 33 (11) ◽  
pp. 1917-1924 ◽  
Author(s):  
Violeta Lazic ◽  
Montserrat Filella ◽  
Andrew Turner
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Plastic Materials ◽  
Laser Induced Breakdown

In this study, the feasibility of measuring the Sb content in different plastic materials by laser induced plasma spectroscopy (LIBS) is explored.

Modeling of Ethylene in Pipeline Leak Detection System

2004 ◽  
Author(s):  
Jakob Bu¨chert
Keyword(s):  
Real Time ◽  
Detection System ◽  
Leak Detection ◽  
Practical Experience ◽  
Time Model ◽  
Pump Stations ◽  
Pipeline Model ◽  
Improve Determination

This paper describes experiences with an improved equation of state (EOS) for ethylene for an existing real time pipeline model. The main scope of the model is leak detection, batch, contaminant and pig tracking. Altogether the pipeline model includes transportation of batched liquid ethylene, ethane, propane, butane and natural gas liquids (NGL). The pipeline is approximately 1900 miles miles long and includes laterals, 33 pump stations, 9 injection/delivery stations and 5 propane terminals. Originally the model used a BWRS EOS for all the above products. At that time a number of false leak alarms were experienced related to pipeline sections containing ethylene. A case study was carried out, specifically for ethylene, to investigate the effect of replacing the BWRS EOS with a modified Helmholtz EOS. The study showed that replacing the EOS on average would improve determination of the ethylene densities by 1.6%–5.6% with an expected reduction in the alarm rate for ethylene cases by approximately 50%. As a result the modified Helmholtz EOS was implemented in the real time model. Results are presented to show the practical experience with the new EOS gained over the last years.

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