000			02197nam a2200265 4500
001			392325
090			_a392325
100			_a20140120d2012 y0pory50 ba
101			_aeng
200			_aEvaluation of cross-contamination of nylon bags with heavy loaded petrol fire debris _fFilipa Belchior
210			_aLancashire _c[s.n.] _d2012
215			_axiii, 116, [38] p. anexos _d30 cm
300			_aSubmitted (September 2012) in partial fulfilment of the requirement for the degree of Masters of Science in Fire Investigation - School of Forensic and Investigative Sciences - University of Central Lancashire (UCLan).
330			_aThe integrity of evidence is extremely important in forensic science and in the judicial system to avoid miscarriages of justice. Contamination and cross-contamination must be prevented. Evidence should be packed in a container that prevents loss or addition to the material. Nylon bags are the most used container for fire debris evidence in the UK and are also used in several European countries. Cross-contamination of nylon bags in normal casework conditions was studied, using heavy loaded petrol fire debris and using automotive topcoat thinner (oxygenated solvent). Samples were sealed with swan-neck with plastic cable ties in both ends and were stored in crates, typically used in the UK to transport evidence from the fire scene to the laboratories. The analyses were performed using gas chromatography / mass spectrometry. Cross-contamination was found for petrol in the two brands of nylon bags used, after significantly different periods of time. In both brands the same aromatic compounds were identified. Cross-contamination was also found using automotive topcoat thinner and using only one brand of bags. Oxygenated compounds and one aromatic compound were identified.
606			_aCIÊNCIA FORENSE _9321508
606			_aINCÊNDIO _9243828
606			_aRECOLHA DA PROVA _9322094
606			_aANÁLISE DE VESTÍGIOS _9320649
606			_aPRESERVAÇÃO DA PROVA _9302776
606			_aTESE _9334284
700			_aBELCHIOR _bFilipa _9353764
955			_xOferta