Publication: Exploration of the influence of recovery surface for the determination of methamphetamine through colour test
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Date
2025-02
Authors
Quan, Ng Jia
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Abstract
The varying recovery surfaces could influence the qualitative detection of methamphetamine using Marquis and Simon's reagents, aiming to enhance forensic analysis techniques. The general objective of this study was to determine the minimum detectable amount of methamphetamine and assess the effects of various paper types on colour reaction visibility and reliability. In this study, methamphetamine samples with a purity of 99.2% were mixed with cutting agents at a constant 20:80 ratio for chemical testing. Experimental trials were conducted using different types of paper, including multipurpose paper, mahjong paper, drawing paper, filter paper, and glossy paper. Marquis and Simon's reagents were applied to each surface, and the reactions were observed and documented over time. The findings revealed that detection sensitivity varied significantly across paper types. On filter paper, the rapid absorption of Simon's reagent, primarily composed of deionised water, prevented droplet formation essential for reaction. This quick dispersion likely reduced contact time, hindering proper colour development for methamphetamine detection. Conversely, the Marquis reagent provided more consistent results across different surfaces. However, the reaction between concentrated sulfuric acid in Marquis reagent and the cellulose in paper caused carbonisation, leading to surface brown discoloration or charring. This phenomenon further influenced the visibility of colour reactions on paper surfaces. To conclude, this research underscores the importance of understanding how recovery
surfaces and chemical interactions influence forensic detection outcomes highlighting
the need for tailored reagent applications to improve detection reliability in forensic laboratories.