Investigation of hydrogen cyanide generation from the cyanoacrylate fuming process used for latent fingermark detection.
Summary of "Investigation of hydrogen cyanide generation from the cyanoacrylate fuming process used for latent fingermark detection."
Cyanoacrylate fuming is one of the most common techniques employed for the detection of latent fingermarks on non-porous surfaces such as plastic and glass. The technique is generally applied by exposing items of interest to the vapours generated by heating a suitable quantity of commercial cyanoacrylate adhesive. In this study, the potential for highly toxic hydrogen cyanide (HCN) to be generated from the overheating of cyanoacrylate was investigated. Two commercial cyanoacrylate adhesives and two quantitative methods for the determination of HCN were employed: (i) the sodium picrate method; and (ii) the picrate-resorcinol method. (13)C nuclear magnetic resonance (NMR) analysis was used to confirm the presence of cyanide. In addition, the thermal decomposition of cyanoacrylate was studied using simultaneous thermogravimetric and differential thermal analysis (TGA-DTA). It was determined that detectable and quantifiable amounts of HCN were generated from the thermal decomposition of cyanoacrylate monomer and polymer at temperatures as low as 200°C. Using an optimised picrate-resorcinol method, it was shown that around 10μg of HCN could be generated from the heating of 1g of cyanoacrylate monomer at 200°C. For one of the adhesives tested, this increased to above 100μg of HCN when 1g of cyanoacrylate monomer was heated at 280°C. Recommendations are provided that, if followed, should ensure that the cyanoacrylate fuming process can be safely applied with minimal risk to the operator.
Affiliation
Centre for Forensic Science, University of Technology Sydney, PO Box 123, Broadway, Sydney NSW 2007, Australia.
Journal Details
This article was published in the following journal.
Name: Forensic science international
ISSN: 1872-6283
Pages: 143-9
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21737219
- DOI: http://dx.doi.org/10.1016/j.forsciint.2011.06.004
Medical and Biotech [MESH] Definitions
Hydrogen Cyanide
Hydrogen cyanide (HCN); A toxic liquid or colorless gas. It is found in the smoke of various tobacco products and released by combustion of nitrogen-containing organic materials.
Hydrofluoric Acid
Hydrofluoric acid. A solution of hydrogen fluoride in water. It is a colorless fuming liquid which can cause painful burns.
Nitriles
Organic compounds containing the -CN radical. The concept is distinguished from CYANIDES, which denotes inorganic salts of HYDROGEN CYANIDE.
Cyanides
Inorganic salts of HYDROGEN CYANIDE containing the -CN radical. The concept also includes isocyanides. It is distinguished from NITRILES, which denotes organic compounds containing the -CN radical.
Social Planning
Interactional process combining investigation, discussion, and agreement by a number of people in the preparation and carrying out of a program to ameliorate conditions of need or social pathology in the community. It usually involves the action of a formal political, legal, or recognized voluntary body.
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