PPT-Forensic Science Unit 7: Questioned Documents and Chromatography

Evidence 1 Class characteristicink analysis paper analysis most handwriting analysis 2 Individual characteristicWith document analysis it is difficult to identify to an individual characteristic except with typewriter or printer specific marks. PREPARED BY-. MD.MARUF HASSAN. Chromatography. The process or technique of separating molecules or components in a mixture . solution (gas or . liquid) . according . to the differential absorption and elution . Chapter 4. Best Broken into four categories. Theoretical Background. Gas Chromatography. HPLC. Quantitation, Calibration, Standardisation and Validation. Theory. Review of Partitioning. You need to be aware of the following concepts in order to have any idea about this chapter!. Forensic Science. Questioned Document . Any document about which some issue has been raised, or that is the subject of an investigation. 2. Document Examiners. Mostly examine handwriting to originate its . Questioned Documents. Definition:. Any document about which some issue has been raised or that is the subject of an investigation. Questioned Document Examination. The part of forensic science pertaining to documents.. BP Schools Link. Looking for Chemicals which are hidden . BP Schools Link – . Creative Chromatography. 8. In some products the chemicals we want to measure can be hidden / masked by other bigger molecules. CLASS: FORM 2. AGE GROUP: 12 -13. LEVEL: MEDIUM ABILITY CLASS. OBJECTIVES OF FORENSIC SCIENCE. Been in the syllabus for the last . 3 years. MAIN OBJECTIVES INCLUDE:. Guide . students to describe the importance of forensic science to solve crimes and relate . Principle and Definition. Principle. The principle of chromatographic separation is very simple. The process is achieved by . distributing the substances. to be separated between a . mobile phase. and a . Forensic Science. Copyright and Terms of Service. Copyright © Texas Education Agency, 2011. These materials are copyrighted © and trademarked ™ as the property of the Texas Education Agency (TEA) and may not be reproduced without the express written permission of TEA, except under the following conditions:. Hazards and Controls. Flash Chromatography. Hazard . Control. Spilled solvent could contact skin. Solvent could penetrate through gloves and contact skin . Wear goggles, gloves (nitrile), and lab coat. A . questioned document. is one in which the document in its entirety, or in part, is subject to question as to its authenticity and/or origin. . Any signature, handwriting, typewriting, or other mark whose source or authenticity is in dispute or is doubtful.. Stationary phase. Mobile phase. Separation AND Characterization. Chromatography Basics. Based on different affinities for stationary and mobile phases. Silica gel: polar, water-covered surface. Compound(s). Instrumental Analysis Instrumentation Paper Chromatography GC – Gas Chromatography HPLC- High Performance Liquid Chromatography IR – Infrared Spectroscopy UV-Vis Spectroscopy MS – Mass Spectrometry Chapter 14 FORENSIC ASPECTS OF FIRE INVESTIGATION FORENSIC SCIENCE: An Introduction by Richard Saferstein 1 Introduction Arson investigations often present complex and difficult circumstances to study due A. . technique for the separation of a mixture by passing it in solution or suspension through a medium in which the components move at . different . rates. .. Principle. It is based on the principle of the partition of the solute between two phases/solvents.