Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Physical Sciences and Mathematics
Qualitative Analysis For The Characterization And Discrimination Of Printing Inks, Rhett J. Williamson
Qualitative Analysis For The Characterization And Discrimination Of Printing Inks, Rhett J. Williamson
FIU Electronic Theses and Dissertations
Improvements in printing technology and the wide accessibility of advanced printers has resulted in an increase in counterfeiting. Of particular interest to forensic document examiners, ink analysis of security documents has emerged as an important tool for the analysis, comparison, and association of inks to a potential production source. In this study, methods were developed for Py-GC/MS, ATR-FTIR, DART-MS, and MALDI-MS analyses of printing inks of four classes: 78 inkjet inks, 76 toners, 79 offset inks, and 86 intaglio inks in order to generate information on the organic chemical characterization of the inks to determine the ability to associate and …
Development Of A Surface-Enhanced Raman Spectroscopy Method For The Detection Of Benzodiazepines In Urine, Erika L. Doctor
Development Of A Surface-Enhanced Raman Spectroscopy Method For The Detection Of Benzodiazepines In Urine, Erika L. Doctor
FIU Electronic Theses and Dissertations
Benzodiazepines are among the most prescribed compounds for anti-anxiety and are present in many toxicological screens. These drugs are also prominent in the commission of drug facilitated sexual assaults due their effects on the central nervous system. Due to their potency, a low dose of these compounds is often administered to victims; therefore, the target detection limit for these compounds in biological samples is 10 ng/mL. Currently these compounds are predominantly analyzed using immunoassay techniques; however more specific screening methods are needed.
The goal of this dissertation was to develop a rapid, specific screening technique for benzodiazepines in urine samples …
Method Development For The Analysis Of Smokeless Powders And Organic Gunshot Residue By Ultra Performance Liquid Chromatography With Tandem Mass Spectrometry, Jennifer L. Thomas
Method Development For The Analysis Of Smokeless Powders And Organic Gunshot Residue By Ultra Performance Liquid Chromatography With Tandem Mass Spectrometry, Jennifer L. Thomas
FIU Electronic Theses and Dissertations
The goal of this project was to develop a rapid separation and detection method for analyzing organic compounds in smokeless powders and then test its applicability on gunshot residue (GSR) samples. In this project, a total of 20 common smokeless powder additives and their decomposition products were separated by ultra performance liquid chromatography (UPLC) and confirmed by tandem mass spectrometry (MS/MS) using multiple reaction monitoring mode (MRM). Some of the targeted compounds included diphenylamines, centralites, nitrotoluenes, nitroglycerin, and various phthalates. The compounds were ionized in the MS source using simultaneous positive and negative electrospray ionization (ESI) with negative atmospheric pressure …