Spectral clustering based on histogram of oriented gradient (HOG) of coal using laser-induced breakdown spectroscopy

2021 ◽  
Author(s):  
Ji Chen ◽  
Kaiping Zhan ◽  
Qingzhou Li ◽  
Zhiyang Tang ◽  
Chenwei Zhu ◽  
...  
Keyword(s):  
Spectral Clustering ◽  
Matrix Effects ◽  
Unsupervised Clustering ◽  
Laser Induced Breakdown Spectroscopy ◽  
Histogram Of Oriented Gradient ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
The Matrix ◽  
Quantification Accuracy

The quantification accuracy of laser-induced breakdown spectroscopy was limited due to matrix effects. In this work, a method named unsupervised-clustering-based quantification (UCQ) was proposed to reduce the matrix effects by...

Effective Normalization Technique for Correction of Matrix Effects in Laser-Induced Breakdown Spectroscopy Detection of Magnesium in Powdered Samples

2002 ◽  
Vol 56 (4) ◽  
pp. 433-436 ◽  
Author(s):  
S. I. Gornushkin ◽  
I. B. Gornushkin ◽  
J. M. Anzano ◽  
B. W. Smith ◽  
J. D. Winefordner
Keyword(s):  
Matrix Effects ◽  
Certified Reference Materials ◽  
Sample Surface ◽  
Laser Induced Breakdown Spectroscopy ◽  
Adhesive Tape ◽  
Breakdown Spectroscopy ◽  
Wide Range ◽  
Laser Induced Breakdown ◽  
The Matrix

The goal of this research was to investigate the influence of the matrix on the laser-induced spectroscopy of magnesium. Powdered samples were used and were presented to the measurement as thin distributions on adhesive tape. A wide range of NIST certified reference materials were used as samples. With careful sample preparation and correction for sample surface density on the tape (determined by weighing), reasonable consistency in the Mg signal intensity was obtained regardless of sample matrix. Relative error of ∼10% and a precision of 10–20% were obtained for the determination of Mg in several certified samples.

A NOVEL STRATEGY FOR DIRECT ELEMENTAL DETERMINATION USING LASER-INDUCED BREAKDOWN SPECTROSCOPY: FLUENCE CALIBRATION

2021 ◽  
Author(s):  
Raquel C Machado ◽  
Diego Victor Babos ◽  
Daniel Fernandes Andrade ◽  
Edenir Rodrigues Pereira-Filho
Keyword(s):  
Quantitative Analysis ◽  
Matrix Effects ◽  
Calibration Method ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Elemental Determination ◽  
Laser Induced Breakdown ◽  
Direct Solid Analysis ◽  
Novel Strategy ◽  
Direct Solid

Quantitative analysis requires several efforts to obtain an adequate calibration method to overcome matrix effects employing direct solid analysis by laser-induced breakdown spectroscopy (LIBS). To this end, in this study,...

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.

Comparison of the matrix effect in laser induced breakdown spectroscopy analysis of coal particle flow and coal pellets

2021 ◽  
Author(s):  
Ziyu Yu ◽  
Shunchun Yao ◽  
Yuan Jiang ◽  
Weize Chen ◽  
Shuixiu Xu ◽  
...  
Keyword(s):  
Matrix Effect ◽  
Coal Particle ◽  
Particle Flow ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectroscopy Analysis ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
The Matrix

Laser-induced breakdown spectroscopy analysis of coal particle flow presents milder matrix effect compared with coal pellet.

Study of Matrix Effects in Laser-induced Breakdown Spectroscopy by Laser defocus and Temporal Resolution

2021 ◽  
Author(s):  
Wei Wang ◽  
Lanxiang Sun ◽  
Peng Zhang ◽  
Tong Chen ◽  
Liming Zheng ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Matrix Effects ◽  
Laser Induced Breakdown Spectroscopy ◽  
Analysis Method ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The laser-induced breakdown spectroscopy (LIBS) analysis method displays a significant matrix effects which greatly hinder the application of this technology. Even if the concentration of a certain element is constant,...

Standoff monitoring of aqueous aerosols using nanosecond laser-induced breakdown spectroscopy: droplet size and matrix effects

2017 ◽  
Vol 56 (13) ◽  
pp. 3773 ◽  
Author(s):  
Luis Alonso Álvarez-Trujillo ◽  
Violeta Lazic ◽  
Javier Moros ◽  
J. Javier Laserna
Keyword(s):  
Droplet Size ◽  
Matrix Effects ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Aqueous Aerosols

Speciation of Chromium via Laser-Induced Breakdown Spectroscopy of Ion Exchange Polymer Membranes

2005 ◽  
Vol 59 (2) ◽  
pp. 252-257 ◽  
Author(s):  
Christopher R. Dockery ◽  
Jack E. Pender ◽  
Scott R. Goode
Keyword(s):  
Cation Exchange ◽  
Natural Waters ◽  
Limit Of Detection ◽  
Polymer Membranes ◽  
Solution Concentration ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Chromium Vi ◽  
Laser Induced Breakdown ◽  
The Matrix

A new method for the speciation of ng/mL concentrations of Cr(III) and Cr(VI) solutions with analysis by laser-induced breakdown spectroscopy (LIBS) is reported. Speciation is achieved by pre-concentration of the chromium onto commercially available cation exchange polymer membranes. Chromium(III) is removed directly by cation exchange; chromium(VI) in the filtrate is reduced to Cr(III) and concentrated onto a second cation exchange membrane, affording independent measurement of both species. Large volumes of waters containing Cr(III) and Cr(VI) can be concentrated onto the membranes and directly analyzed by laser-induced breakdown spectroscopy. The estimated limit of detection corresponds to 500 ng of Cr on the membrane: if a solution volume of 1 L is used, then the detection limit corresponds to a solution concentration of 0.5 ng/mL. Excellent separation of the chromium species is attained. Results show that overall method efficiencies range from 94–116% and are independent of the matrix. The influence of pH has been measured, and although Cr(VI) converts to Cr(III) in acidic solutions, the total Cr recoveries are not appreciably influenced by pH over the range of natural waters (4 to 9). In addition, speciation was performed in the presence of a number of different cations and showed that the method is robust in many different and complex matrices.

Sign in / Sign up

Export Citation Format

Share Document