Skip to comments.Making criminals leave chemical fingerprints
Posted on 12/13/2012 11:09:56 AM PST by aimhigh
Scientists in Brazil have shown that luminescent lanthanide tags can be added to ammunition to enable visual identification of gunshot residue at crime scenes, and even on a shooters hands, using an ultraviolet lamp.
Scanning electron microscopy-energy dispersive spectroscopy analysis is currently used to identify some types of gunshot residue, but environmental and occupational contamination can give false negatives. The method is also time-consuming and limited by the need to obtain adequate sample quantities. Another problem is that lead-free ammunition is now coming into use to avoid lead pollution and its resulting impact on human health. (The blood level of lead in shooting instructors, for example, is near the limit set out by the National Institute for Occupational Safety and Health of 60µg lead per 100g blood.) But, this ammunition cannot be unequivocally identified, as the techniques used rely on identifying lead as a characteristic compound in gunshot residue.
(Excerpt) Read more at rsc.org ...
How did you find RSC’s Chemistry World?
I have a program on my IPAD called Zite. It feeds me articles based on my interests, and this article showed up.
What are your interests, chemistry, ammo, forensics, science, etc.? I linked your thread.
I love articles on gadgets, technology, and I keep up on firearm articles for a website I manage for a firearm association.
Thanks for the reply.