火场裂解产物对检验结果的影响

分析了汽油纵火案件中火场高温裂解产物对检验结果判定的影响。提取燃烧物中汽油残留成分后进行解吸，并用气质联用仪分析检测汽油的主要成分，通过燃烧试验考察汽油燃烧前后组分的分布及变化规律，分析火场中常见高分子材料裂解产物对汽油定性的干扰。试验表明汽油燃烧后轻组分减少，重组分相对增加，火场中的高分子材料裂解后主要产生 C9~C12 直链或支链烷烃和苯系物，而萘系物和茚满类产生相对较少。检验鉴定中重点在提取，难点在结果判断。

Influence of the fire scene pyrolytic products on the test results

Analyzes the influence of pyrolytic products in the fire scene on the test results in the case of gasoline arson. The residual components of gasoline in the combustion products were extracted and desorbed.The main components of gasoline were analyzed and detected by gas chromatography- mass spectrometer.The distribution and change rule of components before and after the combustion of gasoline and the interference of common polymer materials in the fire field on gasoline identification were analyzed through combustion test. The results showed that the light components of gasoline decrease and the heavy components increase relatively after combustion. The polymer materials in the fire field mainly produce C9 ~C1 2 straight chain or branched alkanes and benzene series after cracking, while naphthalene series and indene series produce are relatively less. The emphasis of inspection and identification is on extraction, and the difficulty is in result judgment.