کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
95329 160427 2015 8 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Chemical and physical characterisation of welding fume particles for distinguishing from gunshot residue
ترجمه فارسی عنوان
خصوصیات شیمیایی و فیزیکی ذرات دوده جوشکاری برای تشخیص ته مانده گلوله
کلمات کلیدی
علم پزشکی قانونی؛ باقی مانده گلوله؛ ذرات دوده جوش ؛ Spherules؛ میکروسکوپ الکترونی اسکن؛ میکروسکوپ اشعه ایکس
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی


• Modern ammunition dissipates particles of abundant elements: aluminium or titanium.
• Spherules consisting of light elements are also present in welding fume.
• Chemical and morphological characterisation of particles with SEM–EDX was performed.
• Populations of gunshot residue and welding particles can be distinguished.
• Single spherules consisting from light elements cannot be assigned to either group.

Spherical particles produced by firearms loaded with a traditional ammunition reveal characteristic elemental contents and so their identification may provide a significant evidence in criminal investigations. With the advent of modern technologies in manufacturing ammunition, which replace toxic compounds of lead, antimony and barium in the primer mixture by elements and compounds such as powdered aluminium, titanium, amorphous boron or calcium silicide, differentiation between gunshot residue and morphologically similar particles originating from other anthropogenic or natural sources becomes more difficult. This work provides a chemical and morphological characterisation of welding fume particles originating from both the core and the covering of electrodes used in popular manners of welding steel and aluminium alloy constructions. With the use of scanning electron microscopy and energy dispersive X-ray spectrometry it has been established that single spherules containing aluminium, titanium or a set of such elements as aluminium, silicon, potassium and calcium may occur in result of welding processes, however, they are accompanied by great numbers of iron and iron oxide spherules. Thus, with this analytical method a population of welding particles can be distinguished from a population of gunshot residue originating from a modern type of ammunition, but a special care has to be taken when assessing the evidential value of single or few spherules consisting from light elements being detected in result of the search for gunshot residue for forensic purposes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forensic Science International - Volume 254, September 2015, Pages 51–58
نویسندگان
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