Un nuovo e semplice metodo per i residui di sparo: estrazione + analisi al gas-cromatografo.
Tuesday, April 8, 2008
New Method Improves Gunshot Residue Analysis
Scientists in Texas report development of a dependable, rapid, and inexpensive new method for identifying the presence of gunshot residue (GSR). The test fills a GSR-detection gap that results from wider use of "green"--lead free—ammunition.
It requires only a single speck of GSR smaller than the period at the end of this sentence and could boost the accuracy of one of the most widely used tests employed at crime scenes involving gunplay, according to the researchers.
The new method extracts almost all components of gunpowder residue from particles about 15 times smaller than the width of a human hair, without the use of chemical reagents. After extraction, gas chromatography coupled with a nitrogen phosphorus detector is used to separate and identify the analytes.
This research was presented at the 235th American Chemical Society National Meeting in New Orleans, LA.
Full Text: EurekAlert