Detection and Classification of Ignitable Liquid Residues in the Presence of Matrix Interferences by Using Direct Analysis in Real Time Mass Spectrometry,

Barnett, Isabella; Bailey, Frank C.; Zhang, Mengliang

doi:10.1111/1556-4029.14029

Cited by 28 publications

(15 citation statements)

References 20 publications

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“…The fiber samples could be secured with forceps for DART-MS analysis, but the fiber filaments could be easily lost when drawn into the mass spectrometer vacuum system under the influence of the hot gas stream. In our previous study, carpet fibers accumulated around the orifice of the mass spectrometer after about 20 analyses, and the reproducibility of the result was poor even after the addition of a tweezer module for holding the sample object at a relatively consistent position . Disposable copper sample pots were used in this study for TD/Py-DART-MS analysis, which allowed for a single fiber to be placed into the reservoir (cylinder shape, inner diameter 2 mm, depth 1.6 mm) directly and then analyzed without the influence of the gas stream during the process.…”

Section: Resultsmentioning

confidence: 99%

“…The total analysis time was 6.7 min. The TD/Py-DART-MS instrument setup can be found in Figure S1 and in our previous publication …”

Section: Methodsmentioning

confidence: 99%

“…Direct analysis in real time-mass spectrometry (DART-MS) is becoming a popular tool in forensic laboratories and can offer an alternative method for fiber analysis. DART-MS requires limited sample preparation and can be equipped with various modules for versatile applications . Trade-offs of DART-MS compared to the traditional hyphenated MS techniques such as LC–MS or GC/MS are the loss of chromatographic information, potential ion suppression for MS detection, and increased complexity of mass spectral data.…”

mentioning

confidence: 99%

“…Trade-offs of DART-MS compared to the traditional hyphenated MS techniques such as LC–MS or GC/MS are the loss of chromatographic information, potential ion suppression for MS detection, and increased complexity of mass spectral data. A thermal desorption/pyrolysis device coupled with DART-MS (named TD/Py-DART-MS) was applied to analyze explosives, automotive paints, and ignitable liquids in previous studies. − These studies showed that this technique can preserve information about the volatility of compounds, reduce the ion suppression effect, decrease the complexity of mass spectra, and add an additional chronological/temperature dimension to DART-MS data. In the current study, the TD/Py-DART-MS method was developed to characterize various fiber samples.…”

mentioning

confidence: 99%

“…DART-MS requires limited sample preparation and can be equipped with various modules for versatile applications. 12 Trade-offs of DART-MS compared to the traditional hyphenated MS techniques such as LC−MS or GC/MS are the loss of chromatographic information, potential ion suppression for MS detection, and increased complexity of mass spectral data. A thermal desorption/pyrolysis device coupled with DART-MS (named TD/Py-DART-MS) was applied to analyze explosives, automotive paints, and ignitable liquids in previous studies.…”

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confidence: 99%

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Forensic Fiber Analysis by Thermal Desorption/Pyrolysis-Direct Analysis in Real Time-Mass Spectrometry

et al. 2019

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The thermal desorption/pyrolysis-direct analysis in real time-mass spectrometry (TD/Py-DART-MS) method was developed for the analysis of fibers in this study. The fiber samples were pyrolyzed with a temperature gradient and the pyrolysis products were determined by DART-MS. The pyrogram from the TD/Py-DART-MS fiber analysis was found to be associated with the physical properties such as the melting points. At the same time, the TD/Py-DART-MS allows the analyst to obtain the chemical information such as polymeric backbone structures and dyes on the fiber. The pyrolysis profiles of common polymeric fibers in textile materials such as cotton, cellulose triacetate (CT), poly(caprolactam) (nylon-6), poly(hexamethylene adipamide) (nylon-6/6), poly(acrylonitrile) (PAN), poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly(propylene) (PP), and polytrimethylene terephthalate (PTT) and their respective characteristic mass spectra were reported in this study. The fibers from 40 commercial textile samples were analyzed by the TD/Py-DART-MS method, and the statistical methods including principal component analysis (PCA) and Pearson product moment correlation (PPMC) were applied to classify and associate the fibers based on their mass spectral data. The strong correlation between the reference fiber mass spectral profiles and tested fiber mass spectral profiles was observed by using the PPMC method, and the identification accuracy was 97.5%. When combined, the mass spectral and pyrogram data, the types of fibers including the blended fibers were identified effectively. The TD/Py-DART-MS method also demonstrated the promising capability for the identification of dyes on fibers. Overall, the TD/Py-DART-MS method requires small sample size and minimal sample preparation but offers reproducible and multidimensional information for the fiber evidence rapidly (i.e., ∼6.7 min). Since the proposed method is simple to perform and the data are easy to interpret, this approach may significantly contribute to the fiber identification and comparison procedures in forensic settings with high sample throughput potential.

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Section: Resultsmentioning

confidence: 99%

“…The total analysis time was 6.7 min. The TD/Py-DART-MS instrument setup can be found in Figure S1 and in our previous publication …”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Forensic Fiber Analysis by Thermal Desorption/Pyrolysis-Direct Analysis in Real Time-Mass Spectrometry

et al. 2019

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Recent Chemometric Opportunities in Criminalistics

Thanni¹,

Sah²,

Harrington³

2021

Encyclopedia of Analytical Chemistry

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Recently, the growing applicability of chemometrics in various areas of civil and criminal investigations has been instrumental in resolving complex cases. As criminals become more inventive and measurement methods become more prevalent with onsite analysis and more sophisticated with increases in resolution and sensitivity, forensic analysts should be equipped with tools for advancing their laboratory analysis and investigations. The traditional mode of data analysis in criminalistics will not suffice for complex crime lab investigations, hence the need for the understanding and application of the statistical and chemometric tools is indispensable. Accurate interpretation of forensic evidence is critical for achieving justice. The use of chemometrics helps the analyst from designing effective and efficient experiments to the presentation of compelling evidence to the courts. This article highlights the most recent application of chemometrics in different forensic science areas and shows how pivotal statistical tools are to answering consequential questions in criminal investigations.

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Plasma‐based ambient mass spectrometry: Recent progress and applications

Yue

Zhao

et al. 2021

Mass Spectrometry Reviews

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Ambient mass spectrometry (AMS) has grown as a group of advanced analytical techniques that allow for the direct sampling and ionization of the analytes in different statuses from their native environment without or with minimum sample pretreatments. As a significant category of AMS, plasma-based AMS has gained a -• , CO 3 -• , NO 2 -• , and the most abundant species is O 2 -• (Cody & Dane, 2013). A review by Gross (Gross, 2014) explained the ionization mechanism in greater detail, and the typical ions generated in the DART source are shown in Table 2. Another

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Detection and Classification of Ignitable Liquid Residues in the Presence of Matrix Interferences by Using Direct Analysis in Real Time Mass Spectrometry,

Cited by 28 publications

References 20 publications

Forensic Fiber Analysis by Thermal Desorption/Pyrolysis-Direct Analysis in Real Time-Mass Spectrometry

Forensic Fiber Analysis by Thermal Desorption/Pyrolysis-Direct Analysis in Real Time-Mass Spectrometry

Recent Chemometric Opportunities in Criminalistics

Plasma‐based ambient mass spectrometry: Recent progress and applications

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