scholarly journals Elemental Profiling of Surface Water around Dhaka City by Laser Induced Breakdown Spectroscopy

1970 ◽  
Vol 33 (2) ◽  
pp. 209-218 ◽  
Author(s):  
MF Ahmed ◽  
KM Abedin ◽  
ME Sadat ◽  
AI Talukder ◽  
M Wahadoszamen ◽  
...  
Keyword(s):  
Surface Water ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectroscopic Techniques ◽  
Human Beings ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
High Concentrations ◽  
Elemental Profiling ◽  
Academy Of Sciences ◽  
The City

Using the technique of Laser Induced Breakdown Spectroscopy (LIBS), which uses a pulsed laser to create plasma and advanced spectroscopic techniques, we analyzed the contents of surface water (river water) around the city of Dhaka. Several elements such as Li, C, Na, Mg, Al, K, Ca, Ti, Mn, Fe, Sr were identified in the water samples collected in addition to Cr, which was found at two locations at different concentrations. Chromium is a toxic element, and its presence at high concentrations is hazardous for human beings as well as the environment. Its presence in water is suspected due to the effluent discharge from the nearby tanning industries. Semi-quantitative analysis of the chromium present was performed. To our knowledge, this is the first example of the application of the LIBS technique in water analysis in Bangladesh. DOI: 10.3329/jbas.v33i2.4104 Journal of Bangladesh Academy of Sciences, Vol. 33, No. 2, 209-218, 2009

scholarly journals Classification of Greek Olive Oils from Different Regions by Machine Learning-Aided Laser-Induced Breakdown Spectroscopy and Absorption Spectroscopy

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1241
Author(s):  
Nikolaos Gyftokostas ◽  
Eleni Nanou ◽  
Dimitrios Stefas ◽  
Vasileios Kokkinos ◽  
Christos Bouras ◽  
...  
Keyword(s):  
Machine Learning ◽  
Olive Oil ◽  
Absorption Spectra ◽  
Absorption Spectroscopy ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectroscopic Techniques ◽  
Breakdown Spectroscopy ◽  
Olive Oils ◽  
Laser Induced Breakdown

In the present work, the emission and the absorption spectra of numerous Greek olive oil samples and mixtures of them, obtained by two spectroscopic techniques, namely Laser-Induced Breakdown Spectroscopy (LIBS) and Absorption Spectroscopy, and aided by machine learning algorithms, were employed for the discrimination/classification of olive oils regarding their geographical origin. Both emission and absorption spectra were initially preprocessed by means of Principal Component Analysis (PCA) and were subsequently used for the construction of predictive models, employing Linear Discriminant Analysis (LDA) and Support Vector Machines (SVM). All data analysis methodologies were validated by both “k-fold” cross-validation and external validation methods. In all cases, very high classification accuracies were found, up to 100%. The present results demonstrate the advantages of machine learning implementation for improving the capabilities of these spectroscopic techniques as tools for efficient olive oil quality monitoring and control.

Laser focusing geometry effects on laser-induced plasma and laser-induced breakdown spectroscopy in bulk water

2019 ◽  
Vol 34 (1) ◽  
pp. 118-126 ◽  
Author(s):  
Ye Tian ◽  
Lintao Wang ◽  
Boyang Xue ◽  
Qian Chen ◽  
Ying Li
Keyword(s):  
Bulk Water ◽  
Fast Imaging ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectroscopic Techniques ◽  
Laser Induced Plasma ◽  
Breakdown Spectroscopy ◽  
Laser Focusing ◽  
Laser Induced Breakdown ◽  
Geometry Effects

The influences of laser focusing geometry on laser-induced plasma and laser-induced breakdown spectroscopy (LIBS) in bulk water are investigated by using fast imaging and spectroscopic techniques.

scholarly journals A Rapid Method of Identification of Garnet in Beach Sands Using Laser-Induced Breakdown Spectroscopy

2020 ◽  
Vol 43 (2) ◽  
pp. 149-157
Author(s):  
Fariha Tasneem ◽  
Zulfiqar Hasan Khan ◽  
Ahatashamul Islam ◽  
Nuzhat Faiza ◽  
SM Mainul Kabir ◽  
...  
Keyword(s):  
Soil Sample ◽  
Intensity Ratio ◽  
Beach Sand ◽  
Laser Induced Breakdown Spectroscopy ◽  
Average Intensity ◽  
Breakdown Spectroscopy ◽  
Experimental Tool ◽  
Laser Induced Breakdown ◽  
Academy Of Sciences ◽  
Significant Concentration

In this work, Laser Induced Breakdown Spectroscopy (LIBS) has been used for investigating the presence of heavy mineral garnet (X3Y2(SiO4)3, where the X represent either of Ca2+ , Mg2+, Fe2+, Mn2+ and the Y site contain either of Fe3+, Cr2+, Al3+ ) in beach sand samples collected from Sitakunda, Bangladesh. To achieve the goal, in the first attempt, a comprehensive spectral profiling of the laboratory grade garnet was done and the identified emission lines were employed as the reference lines for discovering the presence of the elements of garnet in the LIBS spectra of different sand samples and an arbitrary soil sample. The average intensity ratio for these reference lines of Mg, Al, Fe, Mn, Ca, estimated in different sand samples and the isolated garnet sample, is found to be about 60 % (against the average intensity ratio of about 20 % estimated for general soil sample and garnet), substantiating the presence of garnet in sand with significant concentration. Therefore, LIBS can be used as a useful alternative experimental tool for predicting the presence of minerals in the sand samples and for the exploration of new geological site in Bangladesh. Journal of Bangladesh Academy of Sciences, Vol. 43, No. 2, 149-157, 2019

scholarly journals Identification of Multiple Rare Earths and Other Associated Elements in Zircon by Laser-Induced Breakdown Spectroscopy

2020 ◽  
Vol 44 (1) ◽  
pp. 59-68
Author(s):  
AFMY Haider ◽  
Zulfiqar Hasan Khan
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Laser Induced Breakdown Spectroscopy ◽  
Breakdown Spectroscopy ◽  
Natural Zircon ◽  
Laser Induced Breakdown ◽  
Beach Sands ◽  
Academy Of Sciences ◽  
First Time ◽  
Zircon Mineral

Laser-induced breakdown spectroscopy (LIBS), which is a powerful technique for the detection of minor and trace elements in a sample, has been used to analyze the enriched zircon mineral collected from the beach sands of southern Bangladesh. In addition to zirconium, a large number of rare earth elements viz. cerium, lanthanum, praseodymium, neodymium, ytterbium, gadolinium, dysprosium, erbium, samarium, europium, holmium and yttrium and other associated elements like hafnium, niobium, tantalum, magnesium, calcium, sodium, titanium and iron along with non-metals like phosphorus and silicon were detected in the enriched zircon samples by the LIBS technique. To the best of our knowledge, this is the first time that multiple rare earth elements have been identified in natural zircon by LIBS. Journal of Bangladesh Academy of Sciences, Vol. 44, No. 1, 59-68, 2020

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

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