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Lv R, Wang Z, Ma Y, Li W, Tian J. Machine Learning Enhanced Optical Spectroscopy for Disease Detection. J Phys Chem Lett 2022; 13:9238-9249. [PMID: 36173116 DOI: 10.1021/acs.jpclett.2c02193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Optical spectroscopy plays an important role in disease detection. Improving the sensitivity and specificity of spectral detection has great importance in the development of accurate diagnosis. The development of artificial intelligence technology provides a great opportunity to improve the detection accuracy through machine learning methods. In this Perspective, we focus on the combination of machine learning methods with the optical spectroscopy methods widely used for disease detection, including absorbance, fluorescence, scattering, FTIR, terahertz, etc. By comparing the spectral analysis with different machine learning methods, we illustrate that the support vector machine and convolutional neural network are most effective, which have potential to further improve the classification accuracy to distinguish disease subtypes if these machine learning methods are used. This Perspective broadens the scope of optical spectroscopy enhanced by machine learning and will be useful for the development of disease detection.
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Affiliation(s)
- Ruichan Lv
- Interdisciplinary Research Center of Smart Sensor, Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710071, China
| | - Zhan Wang
- Interdisciplinary Research Center of Smart Sensor, Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710071, China
| | - Yaqun Ma
- Interdisciplinary Research Center of Smart Sensor, Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710071, China
| | - Wenjing Li
- Interdisciplinary Research Center of Smart Sensor, Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi'an, Shaanxi 710071, China
| | - Jie Tian
- Key Laboratory of Molecular Imaging of Chinese Academy of Sciences, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China
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2
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Rawat P, Sharma B, Dey S, Rana A, Mukherjee A, Polana AJ, Mao J, Jia S, Yadav AK, Khillare PS, Sarkar S. Are fireworks a significant episodic source of brown carbon? ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:40252-40261. [PMID: 35404032 DOI: 10.1007/s11356-022-20183-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 04/06/2022] [Indexed: 06/14/2023]
Abstract
We hypothesize that firework events involving the combustion of charcoal fuel, organic binders, metal salts, and cellulose-based wrapping material could be significant transient sources of aerosol brown carbon (BrC). To test this, we couple high time-resolution (1 min) measurements of black carbon (BC) and BrC absorption from a 7-wavelength aethalometer with time-integrated (12-24 h) measurements of filter extracts, i.e., UV-visible, fluorescence, and Fourier-transformed infrared (FT-IR) signatures of BrC, total and water-soluble organic carbon (OC and WSOC), ionic species, and firework tracer metals during a sampling campaign covering the Diwali fireworks episode in India. In sharp contrast to BC, BrC absorption shows a distinct and considerable rise of 2-4 times during the Diwali period, especially during the hours of peak firework activity, as compared to the background. Fluorescence profiles suggest enrichment of humic-like substances (HULIS) in the firework plume, while the enhancement of BrC absorption in the 400-500 nm range suggests the presence of nitroaromatic compounds (NACs). Considerable contributions of WSOC and secondary organics to OC (44.1% and 31.2%, respectively) and of the water-soluble fraction of BrC to total BrC absorption (71.0%) during the Diwali period point toward an atmospherically processed, polar signature of firework-related BrC, which is further confirmed by FT-IR profiles. This aqueous BrC exerts a short-lived but strong effect on atmospheric forcing (12.0% vis-à-vis BC in the UV spectrum), which could affect tropospheric chemistry via UV attenuation and lead to a stabilization of the post-Diwali atmosphere, resulting in enhanced pollutant build-up and exposure.
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Affiliation(s)
- Prashant Rawat
- Department of Earth Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, Nadia, India
- School of Engineering, Indian Institute of Technology (IIT) Mandi, Kamand, Himachal Pradesh, 175075, India
| | - Bijay Sharma
- Department of Earth Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, Nadia, India
- School of Engineering, Indian Institute of Technology (IIT) Mandi, Kamand, Himachal Pradesh, 175075, India
| | - Supriya Dey
- Department of Earth Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, Nadia, India
- School of Engineering, Indian Institute of Technology (IIT) Mandi, Kamand, Himachal Pradesh, 175075, India
| | - Archita Rana
- Department of Earth Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, Nadia, India
| | - Arya Mukherjee
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, Nadia, India
| | - Anuraag J Polana
- Department of Earth Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, Nadia, India
| | - Jingying Mao
- Institute for Environmental and Climate Research, Jinan University, Guangzhou, 510632, People's Republic of China
| | - Shiguo Jia
- Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
- School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Amit K Yadav
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Pandit S Khillare
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Sayantan Sarkar
- Department of Earth Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, 741246, Nadia, India.
- School of Engineering, Indian Institute of Technology (IIT) Mandi, Kamand, Himachal Pradesh, 175075, India.
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3
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Effective oil spill cleaned up with environmentally friendly foams filled with eucalyptus charcoal residue. IRANIAN POLYMER JOURNAL 2022. [DOI: 10.1007/s13726-021-00997-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Source determination of homemade ammonium nitrate using ATR-FTIR spectroscopy, trace elemental analysis and chemometrics. Forensic Chem 2022. [DOI: 10.1016/j.forc.2022.100411] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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5
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Bekhouche S, Trache D, Abdelaziz A, Fouzi Tarchoun A, Chelouche S, Benchaa W, Belgacemi R. Insight into the Effect of Moisture and Thermal Aging on the Degradation of a Pyrotechnic Igniter Composition through Thermogravimetric Kinetics Coupled with Deconvolution Approach. ChemistrySelect 2021. [DOI: 10.1002/slct.202103758] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Slimane Bekhouche
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique, BP 17. Bordj El-Bahri. 16046 Algeria
| | - Djalal Trache
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique, BP 17. Bordj El-Bahri. 16046 Algeria
| | - Amir Abdelaziz
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique, BP 17. Bordj El-Bahri. 16046 Algeria
| | - Ahmed Fouzi Tarchoun
- Energetic Propulsion Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique, BP 17. Bordj El-Bahri 16046 Algeria
| | - Salim Chelouche
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique, BP 17. Bordj El-Bahri. 16046 Algeria
| | - Widad Benchaa
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique, BP 17. Bordj El-Bahri. 16046 Algeria
| | - Raouf Belgacemi
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique, BP 17. Bordj El-Bahri. 16046 Algeria
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de Higuera JM, de Sá IP, Landgraf RL, de Araujo Nogueira AR. Determination of Al, Ba, Cd, Cr, Cu, Fe, Sr, and Ti in Sparkler Candles by MIP OES. FOOD ANAL METHOD 2021. [DOI: 10.1007/s12161-021-02125-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Zapata F, López-Fernández A, Ortega-Ojeda F, Quintanilla G, García-Ruiz C, Montalvo G. Introducing ATR-FTIR Spectroscopy through Analysis of Acetaminophen Drugs: Practical Lessons for Interdisciplinary and Progressive Learning for Undergraduate Students. JOURNAL OF CHEMICAL EDUCATION 2021; 98:2675-2686. [PMID: 35281766 PMCID: PMC8908246 DOI: 10.1021/acs.jchemed.0c01231] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 05/19/2021] [Indexed: 05/10/2023]
Abstract
Infrared (IR) spectroscopy is a vibrational spectroscopic technique useful in chemical, pharmaceutical, and forensic sciences. It is essential to identify chemicals for reasons spanning from scientific research and academic practices to quality control in companies. However, in some university degrees, graduate students do not get the proficiency to optimize the experimental parameters to obtain the best IR spectra; to correlate the IR spectral bands with the molecular vibrations (chemical elucidation); to have some criteria for any substance identification (especially relevant in quality control to recognize counterfeit); and to apply chemometrics for comparing, visualizing, and classifying the IR spectra. This work presents an experimental laboratory practice for an introductory teaching of the IR instrumental conditions in the identification of substances based on visual spectra comparison and statistical analysis and matching. Then, the selected IR conditions are applied to different commercial drugs, in the solid state or in solution, mostly composed of acetaminophen. Finally, the students apply chemometrics analysis to the IR data. This practice was designed for the training in a chemistry subject for undergraduate students of the chemistry, pharmacy, or forensics degrees, among others related to science, medical, food, or technological sciences.
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Affiliation(s)
- Félix Zapata
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical
Engineering, Department of Physics and Mathematics, University Institute of Research
in Police Sciences (IUICP), and Department of Organic Chemistry and Inorganic
Chemistry, University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain
| | - Adrián López-Fernández
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical
Engineering, Department of Physics and Mathematics, University Institute of Research
in Police Sciences (IUICP), and Department of Organic Chemistry and Inorganic
Chemistry, University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain
| | - Fernando Ortega-Ojeda
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical
Engineering, Department of Physics and Mathematics, University Institute of Research
in Police Sciences (IUICP), and Department of Organic Chemistry and Inorganic
Chemistry, University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain
| | - Gloria Quintanilla
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical
Engineering, Department of Physics and Mathematics, University Institute of Research
in Police Sciences (IUICP), and Department of Organic Chemistry and Inorganic
Chemistry, University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain
| | - Carmen García-Ruiz
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical
Engineering, Department of Physics and Mathematics, University Institute of Research
in Police Sciences (IUICP), and Department of Organic Chemistry and Inorganic
Chemistry, University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain
| | - Gemma Montalvo
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical
Engineering, Department of Physics and Mathematics, University Institute of Research
in Police Sciences (IUICP), and Department of Organic Chemistry and Inorganic
Chemistry, University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares, Madrid, Spain
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8
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Bekhouche S, Trache D, Abdelaziz A, Chelouche S, Fouzi Tarchoun A, Boudjellal A, Mezroua A. Towards understanding the effect of humidity on the degradation of pyrotechnic compositions through spectroscopic data combined with chemometric methods. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Slimane Bekhouche
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
| | - Djalal Trache
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
| | - Amir Abdelaziz
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
| | - Salim Chelouche
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
| | - Ahmed Fouzi Tarchoun
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
- Energetic Propulsion Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
| | - Ammar Boudjellal
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
| | - Abderrahmane Mezroua
- Energetic Materials Laboratory Teaching and Research unit of Energetic Processes Ecole Militaire Polytechnique BP 17, Bordj El-Bahri 16046 Algiers Algeria
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9
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Sauzier G, van Bronswijk W, Lewis SW. Chemometrics in forensic science: approaches and applications. Analyst 2021; 146:2415-2448. [PMID: 33729240 DOI: 10.1039/d1an00082a] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Forensic investigations are often reliant on physical evidence to reconstruct events surrounding a crime. However, there remains a need for more objective approaches to evidential interpretation, along with rigorously validated procedures for handling, storage and analysis. Chemometrics has been recognised as a powerful tool within forensic science for interpretation and optimisation of analytical procedures. However, careful consideration must be given to factors such as sampling, validation and underpinning study design. This tutorial review aims to provide an accessible overview of chemometric methods within the context of forensic science. The review begins with an overview of selected chemometric techniques, followed by a broad review of studies demonstrating the utility of chemometrics across various forensic disciplines. The tutorial review ends with the discussion of the challenges and emerging trends in this rapidly growing field.
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Affiliation(s)
- Georgina Sauzier
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
| | - Wilhelm van Bronswijk
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
| | - Simon W Lewis
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
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10
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Munjal P, Sharma B, Sethi JR, Dalal A, Gholap SL. Identification and analysis of organic explosives from post-blast debris by nuclear magnetic resonance. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:124003. [PMID: 33265036 DOI: 10.1016/j.jhazmat.2020.124003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 08/20/2020] [Accepted: 09/14/2020] [Indexed: 06/12/2023]
Abstract
The growing threat of terrorism has triggered an urgent need to find effective ways to improve the analysis of explosives. This will aid forensic scientists in analysing the post-blast debris, which in turn helps the law enforcement agencies to frame suitable regulations. Analysis of post-blast debris is challenging as it hosts a massive amount of complexity. There are various techniques reported till date such as mass spectrometry, gas chromatography, high-performance liquid chromatography, Fourier transform infrared spectroscopy, and Raman spectroscopy for the analysis of post-blast residues. However, none of them has been able to identify the structural composition of the explosives. The current research study focuses on identifying the structural composition of the explosives from the post-blast debris using the nuclear magnetic resonance (NMR) technology. The post-blast analytes were extracted from soil samples, cleaned by the solid phase extraction (SPE) method and were rapidly analysed by the nuclear magnetic resonance spectrometer. This paper reports the identification of nitro organic explosives such as pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT) and 2,4,6-trinitrophenylmethylnitramine (tetryl) in post-blast debris by 400 MHz nuclear magnetic resonance spectrometer.
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Affiliation(s)
- Priyanka Munjal
- Chemistry & Toxicology Division, LNJN National Institute of Criminology and Forensic Science, Ministry of Home Affairs, Sec-3, Rohini, Delhi 110085, India.
| | - Bhumika Sharma
- Chemistry & Toxicology Division, LNJN National Institute of Criminology and Forensic Science, Ministry of Home Affairs, Sec-3, Rohini, Delhi 110085, India
| | - J R Sethi
- Chemistry & Toxicology Division, LNJN National Institute of Criminology and Forensic Science, Ministry of Home Affairs, Sec-3, Rohini, Delhi 110085, India
| | - Anu Dalal
- Chemistry Department, Indian Institute of Technology Delhi, New Delhi 110016, India
| | - Shivajirao L Gholap
- Chemistry Department, Indian Institute of Technology Delhi, New Delhi 110016, India
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11
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D'Uva JA, DeTata D, May CD, Lewis SW. Investigations into the source attribution of party sparklers using trace elemental analysis and chemometrics. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:4939-4948. [PMID: 33030194 DOI: 10.1039/d0ay01319f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In Australia, party sparklers are commonly used to initiate or prepare inorganic based homemade explosives (HMEs) as they are the most easily accessible and inexpensive pyrotechnic available on the market. As sparkler residue would be encountered in cases involving these types of devices, the characterisation and source determination of the residue would be beneficial within a forensic investigation. The aim of this study is to demonstrate the potential of using trace elemental profiling coupled with chemometric and other statistical techniques to link a variety of different sparklers to their origin. Inductively coupled plasma-mass spectrometry (ICP-MS) was used to determine the concentration of 50 elements in 48 pre-blast sparkler samples from eight sparkler brands/classes available in Australia. Extracting ground-up sparkler residue in 10% nitric acid for 24 hours was found to give the most reliable quantification. The collected data were analysed using Principal Component Analysis (PCA) to visualise the distribution of the sample data and explore whether the sparkler samples could be classified into their respective brands. ANOVA based feature selection was used to remove elements that did not largely contribute to the separation between classes. This resulted in the development of a 7-elemental profile, consisting of V, Co, Ni, Sr, Sn, Sb, W, which could be used to correctly classify the samples into eight distinct groups. Linear Discriminant Analysis (LDA) was subsequently used to construct a discriminant model using four out of six samples from each class. The model successfully classified 100% of the samples to their correct sparkler brand. The model also correctly matched 100% of the remaining samples to the correct class. This demonstrates the potential of using trace elemental analysis and chemometrics to correctly identify and discriminate between party sparklers.
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Affiliation(s)
- Joshua A D'Uva
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia and Curtin Institute of Functional Molecules and Interfaces, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
| | - David DeTata
- ChemCentre, Manning Road, Bentley, 6102, Perth, Western Australia, Australia
| | - Christopher D May
- ChemCentre, Manning Road, Bentley, 6102, Perth, Western Australia, Australia
| | - Simon W Lewis
- School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia and Curtin Institute of Functional Molecules and Interfaces, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia.
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12
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Abstract
This work comprehensively reviews some fundamental concepts about explosives and their two commonly used classifications based on either their velocity of detonation or their application. These classifications are highly useful in the military/legal field, but completely useless for the chemical determination of explosives. Because of this reason, a classification of explosives based on their chemical composition is comprehensively revised, discussed and updated. This classification seeks to merge those dispersed chemical classifications of explosives found in literature into a unique general classification, which might be useful for every researcher dealing with the analytical chemical identification of explosives. In the knowledge of the chemical composition of explosives, the most adequate analytical techniques to determine them are finally discussed.
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Affiliation(s)
- Félix Zapata
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University Institute of Research in Police Sciences (IUICP); and CINQUIFOR# research group, University of Alcalá, Ctra. Madrid-Barcelona km 33.600, Alcalá de Henares, (Madrid) 28871, Spain
| | - Carmen García-Ruiz
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University Institute of Research in Police Sciences (IUICP); and CINQUIFOR# research group, University of Alcalá, Ctra. Madrid-Barcelona km 33.600, Alcalá de Henares, (Madrid) 28871, Spain
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13
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He N, Ni Y, Teng J, Li H, Yao L, Zhao P. Identification of inorganic oxidizing salts in homemade explosives using Fourier transform infrared spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 221:117164. [PMID: 31163327 DOI: 10.1016/j.saa.2019.117164] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 05/20/2019] [Accepted: 05/26/2019] [Indexed: 06/09/2023]
Abstract
Recently, inorganic low explosives, such as pyrotechnic composition, black powder, and ammonium nitrate, are commonly used in improvised explosive devices (IEDs) by the rioter or terrorists since these energetic materials can be obtained easily and legally from civilian markets. Identification of inorganic oxidizing salts in these homemade explosives, including nitrates, chlorates, and perchlorates, is a necessary procedure for forensic investigators to provide criminal evidences. In this article, Fourier transform infrared (FTIR) spectroscopy was used to discriminate NO3-, CO32-, ClO3-, ClO4-, SO42-, and NH4+, whose characteristic absorption bands were explained by vibration modes of the covalent bonds. Then the spectral absorption features of nitrate salts with monovalent or divalent cations were discussed. Furthermore, it was studied whether nitrates or perchlorates can be unequivocally distinguished with the presence of carbonate and sulfate impurities through FTIR technique. Finally, the feasibility of this method was verified through an analytical case of homemade explosives.
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Affiliation(s)
- Ning He
- Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China
| | - Yunchang Ni
- Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China
| | - Jiao Teng
- Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China
| | - Hongda Li
- Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China
| | - Lijuan Yao
- Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China
| | - Pengcheng Zhao
- Department of Forensic Chemistry, Criminal Investigation Police University of China, Shenyang 110035, China.
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Mistek E, Fikiet MA, Khandasammy SR, Lednev IK. Toward Locard's Exchange Principle: Recent Developments in Forensic Trace Evidence Analysis. Anal Chem 2018; 91:637-654. [PMID: 30404441 DOI: 10.1021/acs.analchem.8b04704] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ewelina Mistek
- Department of Chemistry , University at Albany, SUNY , 1400 Washington Avenue , Albany , New York 12222 , United States
| | - Marisia A Fikiet
- Department of Chemistry , University at Albany, SUNY , 1400 Washington Avenue , Albany , New York 12222 , United States
| | - Shelby R Khandasammy
- Department of Chemistry , University at Albany, SUNY , 1400 Washington Avenue , Albany , New York 12222 , United States
| | - Igor K Lednev
- Department of Chemistry , University at Albany, SUNY , 1400 Washington Avenue , Albany , New York 12222 , United States
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15
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16
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Pereira LS, Lisboa FL, Coelho Neto J, Valladão FN, Sena MM. Screening method for rapid classification of psychoactive substances in illicit tablets using mid infrared spectroscopy and PLS-DA. Forensic Sci Int 2018; 288:227-235. [DOI: 10.1016/j.forsciint.2018.05.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Revised: 04/06/2018] [Accepted: 05/01/2018] [Indexed: 12/28/2022]
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17
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Zapata F, García-Ruiz C. The discrimination of 72 nitrate, chlorate and perchlorate salts using IR and Raman spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 189:535-542. [PMID: 28865354 DOI: 10.1016/j.saa.2017.08.058] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 08/03/2017] [Accepted: 08/19/2017] [Indexed: 06/07/2023]
Abstract
Inorganic oxidizing energetic salts including nitrates, chlorates and perchlorates are widely used in the manufacture of not only licit pyrotechnic compositions, but also illicit homemade explosive mixtures. Their identification in forensic laboratories is usually accomplished by either capillary electrophoresis or ion chromatography, with the disadvantage of dissociating the salt into its ions. On the contrary, vibrational spectroscopy, including IR and Raman, enables the non-invasive identification of the salt, i.e. avoiding its dissociation. This study focuses on the discrimination of all nitrate, chlorate and perchlorate salts that are commercially available, using both Raman and IR spectroscopy, with the aim of testing whether every salt can be unequivocally identified. Besides the visual spectra comparison by assigning every band with the corresponding molecular vibrational mode, a statistical analysis based on Pearson correlation was performed to ensure an objective identification, either using Raman, IR or both. Positively, 25 salts (out of 72) were unequivocally identified using Raman, 30 salts when using IR and 44 when combining both techniques. Negatively, some salts were undistinguishable even using both techniques demonstrating there are some salts that provide very similar Raman and IR spectra.
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Affiliation(s)
- Félix Zapata
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University Institute of Research in Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares (Madrid), Spain.
| | - Carmen García-Ruiz
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University Institute of Research in Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona km 33.6, 28871 Alcalá de Henares (Madrid), Spain.
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Analysis of different materials subjected to open-air explosions in search of explosive traces by Raman microscopy. Forensic Sci Int 2017; 275:57-64. [DOI: 10.1016/j.forsciint.2017.02.032] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 02/09/2017] [Accepted: 02/23/2017] [Indexed: 11/21/2022]
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19
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Martín-Alberca C, Ortega-Ojeda FE, García-Ruiz C. Analytical tools for the analysis of fire debris. A review: 2008–2015. Anal Chim Acta 2016; 928:1-19. [DOI: 10.1016/j.aca.2016.04.056] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 04/27/2016] [Accepted: 04/30/2016] [Indexed: 11/16/2022]
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20
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Zapata F, García-Ruiz C. Determination of Nanogram Microparticles from Explosives after Real Open-Air Explosions by Confocal Raman Microscopy. Anal Chem 2016; 88:6726-33. [DOI: 10.1021/acs.analchem.6b00927] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Félix Zapata
- Department of Analytical
Chemistry, Physical Chemistry and Chemical Engineering and University
Institute of Research in Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona Km. 33.6, 28871 Alcalá de Henares, Madrid, Spain
| | - Carmen García-Ruiz
- Department of Analytical
Chemistry, Physical Chemistry and Chemical Engineering and University
Institute of Research in Police Sciences (IUICP), University of Alcalá, Ctra. Madrid-Barcelona Km. 33.6, 28871 Alcalá de Henares, Madrid, Spain
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