field note criminology

Criminology

The luminol test is one of the most used to detect blood at a crime scene, this occurs because luminol produces chemiluminescence when oxidized. For the reaction to occur you need an oxidizing agent, a catalyst and an alkaline. This reaction is carried out using Fe (III) present in the blood as a catalyst, sodium perborate (NaBO4) as an oxidizing agent, and sodium bicarbonate (NaHCO3) as an alkaline medium. In the reaction to be evaluated, luminol is oxidized with sodium perborate in an alkaline medium induced by sodium bicarbonate and in the presence of a catalyst, in this case the Fe in the blood. It is oxidized with sodium perborate, which replaces and releases two nitrogens, causing the luminol to go into a state of excitement. This causes the emission of a photon, which appears as a bluish glow. In this process there is an exothermic reaction and the chemical reaction that occurs is oxidation.

Observations: There are many more tactics that forensic chemistry uses to be able to have different evidence that will help solve a criminal case, some examples are drug test, use of strong water (nitric acid - water), search for fingerprint marks and etc.

Subtítulo

Chemical equation: C₈H₇O₂N₃+ NaBO₄+NaHCO₃+ Fe (III)→ Chemiluminescence/ light in blue color

During this research, I was amazed by this tecnic that make it posible to see blood stains and thanks to that the crime could resolve faster because more clues the better, and its all thanks to chesmistry, since luminol oxidizes which is a chemical reaction and leaves a blue path that I found it very cool and weird.

Freak Data:The first law against crimes: Code of Hammurabi, is one of the first attempts, and perhaps the best known to establish a scale of punishment for crimes, which was written on stone columns. Thus, whoever committed a crime was punished with a punishment similar to the damage caused. According to the Code, for example: "If a man destroys another man's eye, his eye will be destroyed," or "If a man destroys another man's bone, it would brake a bone to him