By combining four techniques commonly used in laboratories, they have been able to determine, relatively easily,explosive or flammable compounds in liquids of doubtful origin, according to the SINC agency. On the one hand, the molecular composition of the substances is obtained with two spectroscopic techniques (Raman and infrared), which can be carried out with portable devices in airports, customs or port offices. On the other hand, to determine which elements the sample presents, an energy dispersive detector (EDS) is used, to which the images provided by a scanning electron microscope (SEM) are added.
To validate the method, scientists have applied it to five samples of confiscated liquids. In four of them the results are consistent with their use for low power fireworks. Alcohols such as isopropyl and methanol were used to solubilize compounds and the scientists were able to produce colored flames. The use ofmethanolas the main solvent it came as a surprise to the team, as this compound is very toxic to humans (causes acidosis and blindness) and its use is restricted in many countries. In another of the liquids, it was also detectedBoric acid, a substance recently added to the “Highly Concern” listof the REACH regulation (registration, evaluation, authorization and restriction of chemical substances) of the European Union. These acids can adversely affect human reproductive function.
