scholarly journals Improving Calibration Strategy for LIBS Heavy Metals Analysis in Agriculture Applications

Photonics ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 563
Author(s):  
Vasily N. Lednev ◽  
Pavel A. Sdvizhenskii ◽  
Mikhail Y. Grishin ◽  
Evgeny A. Nikitin ◽  
Sergey V. Gudkov ◽  
...  
Keyword(s):  
Surface Heterogeneity ◽  
Sample Surface ◽  
Calibration Procedure ◽  
Site Analysis ◽  
Breakdown Spectroscopy ◽  
Heterogeneous Samples ◽  
Laser Induced Breakdown ◽  
Improve Analysis ◽  
Zinc Determination ◽  
Elemental Maps

A new calibration procedure, known as mapping conditional-calibration laser-induced breakdown spectroscopy (LIBS), has been suggested to improve analysis results for heterogeneous samples. The procedure is based on LIBS elemental mapping, followed by signal conditioning in every sampling spot to skip signal outliers, then by finalizing the calibration curve construction. The suggested mapping conditional calibration procedure was verified for zinc analysis in soybean grist samples. The laser parameters correspond to those of the hand-held LIBS instrument in order to estimate the influence of sample surface heterogeneity under on-site analysis conditions. The laser spot (60 μm) was equal to or smaller than the typical size of grist particles (40–500 μm) but laser crater dimensions were significantly greater and varied widely (150–450 μm). The LIBS mapping of different spectral signals (atomic and ionic lines for major and minor components) was achieved. Elemental maps were normalized to achieve signal maps that were conditionally spotted to skip signal outliers. It was demonstrated that the suggested mapping conditional-calibration LIBS provided 15 ppm RMSECV for zinc determination in heterogeneous samples, which is typical for agricultural products.

Determination of Carbon Content in Steel Using Laser-Induced Breakdown Spectroscopy

1992 ◽  
Vol 46 (9) ◽  
pp. 1382-1387 ◽  
Author(s):  
J. A. Aguilera ◽  
C. Aragón ◽  
J. Campos
Keyword(s):  
Carbon Content ◽  
Matrix Effects ◽  
Sample Surface ◽  
Nitrogen Atmosphere ◽  
Laser Induced Breakdown Spectroscopy ◽  
Time Resolved ◽  
Breakdown Spectroscopy ◽  
Use Of Time ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy has been used to determine carbon content in steel. The plasma was formed by focusing a Nd:YAG laser on the sample surface. With the use of time-resolved spectroscopy and generation of the plasma in nitrogen atmosphere, a precision of 1.6% and a detection limit of 65 ppm have been obtained. These values are similar to those of other accurate conventional techniques. Matrix effects for the studied steels are reduced to a small slope difference between the calibration curves for stainless and nonstainless steels.

scholarly journals Development of a Method for the Determination of Chromium and Cadmium in Tannery Wastewater Using Laser-Induced Breakdown Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Mahwish Bukhari ◽  
M. Ali Awan ◽  
Ishtiaq A. Qazi ◽  
M. Anwar Baig
Keyword(s):  
Solid Phase ◽  
Correlation Coefficients ◽  
Sample Surface ◽  
Tannery Wastewater ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Surface Distance ◽  
Laser Induced Breakdown ◽  
Wastewater Samples

This paper illustrates systematic development of a convenient analytical method for the determination of chromium and cadmium in tannery wastewater using laser-induced breakdown spectroscopy (LIBS). A new approach was developed by which liquid was converted into solid phase sample surface using absorption paper for subsequent LIBS analysis. The optimized values of LIBS parameters were 146.7 mJ for chromium and 89.5 mJ for cadmium (laser pulse energy), 4.5 μs (delay time), 70 mm (lens to sample surface distance), and 7 mm (light collection system to sample surface distance). Optimized values of LIBS parameters demonstrated strong spectrum lines for each metal keeping the background noise at minimum level. The new method of preparing metal standards on absorption papers exhibited calibration curves with good linearity with correlation coefficients,R2in the range of 0.992 to 0.998. The developed method was tested on real tannery wastewater samples for determination of chromium and cadmium.

Laser-Induced Breakdown Spectroscopy for Detection of Lead in Concrete

1996 ◽  
Vol 50 (7) ◽  
pp. 880-884 ◽  
Author(s):  
Andrew V. Pakhomov ◽  
William Nichols ◽  
Jacek Borysow
Keyword(s):  
Sample Surface ◽  
Lead Contamination ◽  
Laser Induced Breakdown Spectroscopy ◽  
Time Range ◽  
Calibration Function ◽  
Time Resolved ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
The Matrix ◽  
Scale Down

Time-resolved laser-induced breakdown spectroscopy was applied for quantitative measurement of lead content in concrete at levels down to 10 ppm. The breakdown was formed at the sample surface by a Q-switched ND:YAG laser operating at a 1.06-μm wavelength and a repetition rate of 10 Hz. Contamination levels were inferred from the ratio of the integrated emission line of lead to a known reference line of the matrix. The lead contamination can be determined on an absolute scale down to 10 ppm at an optimum delay time of 3.0 μs. These results were derived from analysis of the temporal evolution of the calibration function within a 0.1- to 19.0-μs time range. The calibration function exhibits no dependence on the incident laser pulse energy, which was varied from 250 to 400 mJ.

Perspective on the use of nanoparticles to improve LIBS analytical performance: nanoparticle enhanced laser induced breakdown spectroscopy (NELIBS)

2016 ◽  
Vol 31 (8) ◽  
pp. 1566-1573 ◽  
Author(s):  
A. De Giacomo ◽  
M. Dell'Aglio ◽  
R. Gaudiuso ◽  
C. Koral ◽  
G. Valenza
Keyword(s):  
Sample Surface ◽  
Analytical Performance ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanoparticle Deposition ◽  
New Approach ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Points Of View

In this paper, the new approach for Laser Induced Breakdown Spectroscopy (LIBS) based on nanoparticle deposition on the sample surface is reviewed from both fundamental and application points of view.

An Optimized Calibration Procedure for Determining Elemental Ratios Using Laser-Induced Breakdown Spectroscopy

2013 ◽  
Vol 85 (3) ◽  
pp. 1492-1500 ◽  
Author(s):  
Jens Frydenvang ◽  
Kjartan Münster Kinch ◽  
Søren Husted ◽  
Morten Bo Madsen
Keyword(s):  
Calibration Procedure ◽  
Laser Induced Breakdown Spectroscopy ◽  
Elemental Ratios ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

On-Line Sorting of Wood Treated with Chromated Copper Arsenate Using Laser-Induced Breakdown Spectroscopy

2002 ◽  
Vol 56 (10) ◽  
pp. 1337-1344 ◽  
Author(s):  
T. M. Moskal ◽  
D. W. Hahn
Keyword(s):  
Treated Wood ◽  
Untreated Wood ◽  
Field Evaluation ◽  
Sample Surface ◽  
Wood Products ◽  
Detector System ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
On Line

This paper details the design, implementation, and field evaluation of an online detector system using laser-induced breakdown spectroscopy (LIBS) for the analysis of copper chromated arsenate (CCA) treated wood products. The LIBS-based instrument functioned by creating the laser-induced plasma directly on the sample surface while wood was translated under the detector system, and was successful in discriminating between CCA treated wood and untreated wood products based on the atomic emission signal of chromium. The system was optimized for plasma emission collection both in and out of the laser focal plane and temporally optimized for chromium analysis using a compact, non-intensified charge-coupled device (CCD)/spectrometer unit. Using either single laser pulse spectra or 5-shot and 10-shot spectral averages, the accuracy of LIBS-based analysis ranged from 92 to 100% for identifying both CCA treated and untreated wood samples from the waste stream at a construction and demolition debris recycling center. Additional implementation issues are discussed in the context of LIBS-based on-line sorting of construction and demolition wood debris.

Effect of Laser-Induced Crater Depth in Laser-Induced Breakdown Spectroscopy Emission Features

2005 ◽  
Vol 59 (7) ◽  
pp. 853-860 ◽  
Author(s):  
Michela Corsi ◽  
Gabriele Cristoforetti ◽  
Montserrat Hidalgo ◽  
Daniela Iriarte ◽  
Stefano Legnaioli ◽  
...  
Keyword(s):  
Sample Surface ◽  
Copper Sample ◽  
Confinement Effect ◽  
Crater Depth ◽  
Laser Induced Breakdown Spectroscopy ◽  
Number Density ◽  
Plasma Properties ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The influence of crater depth on plasma properties and laser-induced breakdown spectroscopy (LIBS) emission has been evaluated. Laser-induced plasmas were generated at the surface and at the bottom of different craters in a copper sample. Plasmas produced at the sample surface and at the bottom of the craters were spatially and temporally resolved. LIBS emission, temperature, and electronic number density of the plasmas were evaluated. It is shown that the confinement effect produced by the craters enhances the LIBS signal from the laser-induced plasmas.

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