Question 1
Spectrometry would indeed be a good analytical tool since it will help in distinguishing the different compounds in the powder. In such a case, the best type of spectroscopy would be infrared spectrometry and mass spectrometry. Infrared spectroscopy is a vital analytical tool to identify controlled substances. Infrared light is passed on the unknown substance. As the sample absorbs the infrared radiation, an infrared spectrum results, which is a series of peaks and valleys ("Physical Evidence Handbook Drug Identification Unit", 2016). Each substance in the compound results in a highly accurate infrared spectrum. The spectrum of the unknown elements can further be compared to that of a known substance hence a conclusion can be drawn, and the substances in the drug sample can be identified.
Also, mass spectrometry can be used in such a case. This method involves a combination of gas chromatography and mass spectrometry. Gas chromatography is useful as it separates the compound into its individual components. Each element enters the mass spectrometer where they are bombarded with electrons. Each compound in the substance later produces a highly definitive mass spectrum which is compared with a known reference standard to identify the substances in the drug sample.
Question 2
X-ray diffraction is a suitable method since it helps in the identification of crystalline samples of which inorganic compounds is among them. The method works by a constructive interference of the sample and monochromatic x-rays. The x-rays are produced by a cathode ray tube, which is filtered to provide monochromatic radiation directed towards the substance. The x-ray diffraction further provides a distinct ‘fingerprint’ of crystal presents in the sample ("Physical Evidence Handbook Drug Identification Unit", 2016). The pattern can further be compared to reference standards and measurements to identify which provides information on the crystalline forms. Therefore this method is essential in identifying inorganic compounds which fall under the crystalline compounds.
Question 3
The gun residue is composed of both burnt and unburnt particles which stay in the hands and clothes of the individual who fires the gunshot. Therefore I such a scenario, examining the hands of the apprehended man would be suitable. A beneficial method in such a case would be the use of x-ray spectrometry by scanning through an electron microscope (Med.utah.edu, 2016). Usually, the elements that make up gun powder are barium, lead, and antimony. Therefore this method will help in distinguishing the various compound in gun powder.
References
Med.utah.edu (2016). Firearms Tutorial. Library.med.utah.edu. Retrieved 23 June 2016, from http://library.med.utah.edu/WebPath/TUTORIAL/GUNS/GUNGSR.html
Physical Evidence Handbook Drug Identification Unit. (2016). Wilenet. Retrieved 23 June 2016,
