2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations
| Format: | General Document |
|---|
| _version_ | 1860798293573894144 |
|---|---|
| building | INTELEK Repository |
| collection | Online Access |
| collectionurl | https://intelek.unisza.edu.my/intelek/pages/search.php?search=!collection3 |
| copyright | Copyright©PWB2025 |
| country | Malaysia |
| date | 2024-10-11 |
| format | General Document |
| id | 16887 |
| institution | UniSZA |
| originalfilename | UNVEILING THE FINGERPRINTS OF FRESH GASOLINE AND BURNT RESIDUES THROUGH CHROMATOGRAPHY AND CHEMOMETRIC TECHNIQUES IN FORENSIC INVESTIGATIONS (PHD_2024).pdf |
| person | Aidil Fahmi Shadan |
| recordtype | oai_dc |
| resourceurl | https://intelek.unisza.edu.my/intelek/pages/view.php?ref=16887 |
| sourcemedia | Server storage Scanned document |
| spelling | 16887 https://intelek.unisza.edu.my/intelek/pages/view.php?ref=16887 https://intelek.unisza.edu.my/intelek/pages/search.php?search=!collection3 General Document Malaysia Library Staff (Top Management) Library Staff (Management) Library Staff (Support) Terengganu English UniSZA East Coast Environmental Research Institute application/pdf 1.4 Chemometrics 224 Server storage Scanned document Universiti Sultan Zainal Abidin UniSZA Private Access Universiti Sultan Zainal Abidin Copyright©PWB2025 Forensic chemistry Dissertations, Academic Aidil Fahmi Shadan Gasoline — Analysis Chromatographic analysis Explosives — Residues — Analysis Fire investigation, Forensic aspects 2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations The identification of accelerants in fire investigations is crucial for criminal prosecution, but it is complicated by weathering effects and high-temperature evaporation. This research addresses the challenge by studying the chemical signatures of fresh and burnt RON95 gasoline under the unique climatic conditions of Malaysia's monsoon seasons. The objectives include determining the chemical compounds in fresh and burnt RON95 gasoline during monsoons, analyzing chemical changes in gasoline residues over different time intervals post-fire (3, 6, and 9 hours), validating laboratory analyses using chemometrics and machine learning, and developing a predictive tool for arson investigations. The methodology employed gas chromatography-mass spectrometry (GC-MS) to identify and quantify compounds in unburnt and burnt gasoline residues. The study compared chemical profiles before and after exposure to detect changes, degradation, or breakdown of components. Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA) were used to assess the effects of gasoline exposure during Malaysia's monsoon seasons. The results revealed key compounds such as toluene, p-xylene, benzene, propyl-, benzene, 1-ethyl-2-methyl-, 1,3,5-trimethylbenzene, and indane in all samples. Significant variations were observed between samples from the Northeast and Southwest seasons, with higher levels in the Northeast season (ANOVA, p<0.05). Samples exposed for 9 hours post-burning had significantly lower compound abundances compared to those exposed for 3 and 6 hours (ANOVA, p<0.05). The iterative method yielded 74% accuracy for PCA, 94% validation accuracy for DA, and 90.0% to 98.0% correct classification rate by LDA. The C&RT model achieved a mean absolute error of 0.4 for brand prediction and 1.1 for location prediction. In conclusion, this research highlights the impact of Malaysian monsoons on the chemical signatures of gasoline accelerants. Accurate and reliable chemical analysis (GC-MS) combined with data analytics (chemometrics and machine learning) is essential for providing robust forensic evidence. The study emphasizes the importance of collecting evidence within 9 hours post-fire to prevent the loss of critical compounds. This research benefits forensic investigations of burnt gasoline, enhancing the capabilities of fire investigators and supporting legal proceedings in arson cases. The integration of advanced analytical techniques ensures scientifically sound and legally admissible evidence collection. uuid:0edffbce-e4b8-4ed6-9396-bb06e9a71af5 macOS Version 12.7.6 (Build 21H1320) Quartz PDFContext UNVEILING THE FINGERPRINTS OF FRESH GASOLINE AND BURNT RESIDUES THROUGH CHROMATOGRAPHY AND CHEMOMETRIC TECHNIQUES IN FORENSIC INVESTIGATIONS (PHD_2024).pdf 2024-10-11 Chromatography, Chemometrics Unveiling the Fingerprints Gasoline Analysis Forensic Chemistry Forensic Investigations Burnt Residue Analysis Thesis |
| spellingShingle | 2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations |
| state | Terengganu |
| subject | Chemometrics Forensic chemistry Dissertations, Academic Gasoline — Analysis Chromatographic analysis Explosives — Residues — Analysis Fire investigation, Forensic aspects |
| summary | The identification of accelerants in fire investigations is crucial for criminal prosecution, but it is complicated by weathering effects and high-temperature evaporation. This research addresses the challenge by studying the chemical signatures of fresh and burnt RON95 gasoline under the unique climatic conditions of Malaysia's monsoon seasons. The objectives include determining the chemical compounds in fresh and burnt RON95 gasoline during monsoons, analyzing chemical changes in gasoline residues over different time intervals post-fire (3, 6, and 9 hours), validating laboratory analyses using chemometrics and machine learning, and developing a predictive tool for arson investigations. The methodology employed gas chromatography-mass spectrometry (GC-MS) to identify and quantify compounds in unburnt and burnt gasoline residues. The study compared chemical profiles before and after exposure to detect changes, degradation, or breakdown of components. Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA) were used to assess the effects of gasoline exposure during Malaysia's monsoon seasons. The results revealed key compounds such as toluene, p-xylene, benzene, propyl-, benzene, 1-ethyl-2-methyl-, 1,3,5-trimethylbenzene, and indane in all samples. Significant variations were observed between samples from the Northeast and Southwest seasons, with higher levels in the Northeast season (ANOVA, p<0.05). Samples exposed for 9 hours post-burning had significantly lower compound abundances compared to those exposed for 3 and 6 hours (ANOVA, p<0.05). The iterative method yielded 74% accuracy for PCA, 94% validation accuracy for DA, and 90.0% to 98.0% correct classification rate by LDA. The C&RT model achieved a mean absolute error of 0.4 for brand prediction and 1.1 for location prediction. In conclusion, this research highlights the impact of Malaysian monsoons on the chemical signatures of gasoline accelerants. Accurate and reliable chemical analysis (GC-MS) combined with data analytics (chemometrics and machine learning) is essential for providing robust forensic evidence. The study emphasizes the importance of collecting evidence within 9 hours post-fire to prevent the loss of critical compounds. This research benefits forensic investigations of burnt gasoline, enhancing the capabilities of fire investigators and supporting legal proceedings in arson cases. The integration of advanced analytical techniques ensures scientifically sound and legally admissible evidence collection. |
| title | 2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations |
| title_full | 2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations |
| title_fullStr | 2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations |
| title_full_unstemmed | 2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations |
| title_short | 2024_Unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations |
| title_sort | 2024_unveiling the fingerprints of fresh gasoline and burnt residues through chromatography and chemometric techniques in forensic investigations |