摘要
目的研究醇酸油漆稀料燃烧残留物在不同放置时间条件下特征组分的变化。方法选取醇酸油漆稀料(X-6型)为研究对象,以脱脂棉为载体,制备其燃烧残留物,在室温25℃左右分别进行0、3、5、7、9d放置时间处理,利用气相色谱-质谱法分析不同放置时间条件下燃烧残留物特征组分变化规律。结果醇酸油漆稀料原样中主要含有芳香烃类和烷烃类物质;燃烧残留物中烷烃类物质消失,新产生稠环芳烃类、多环芳烃类、茚满类物质,放置5d内均能检出,放置7d时,多环芳烃类无法检出,放置9d时仅能检出芳香烃类中的乙苯;均三甲苯、菲、荧蒽、芘可作为目标化合物,其中放置时间对均三甲苯和茚满的含量影响不大,多环芳烃类成分含量增加。结论在实际的火灾调查及物证鉴定工作中,醇酸油漆稀料样品的检出限为5d,应及时对检材进行提取送检。
Objective To probe into the changes of characteristic components of combustion residues from alkyd paint thinners under different durations of placement.Methods The alkyd paint thinner(X-6),selected as the research object,was imbibed into absorbent cottons(as the carrier)that were afterwards ignited and burnt for certain durations before extinguishment,having such resultant combustion residues left and stored for 0,3,5,7 and 9 days,respectively.GC-MS was to analyze the variation of characteristic components of the combustion residues under different durations of storage.Results The original sampling alkyd paint thinner mainly contains aromatic hydrocarbons and alkanes.Alkanes were found of no appearance in the combustion residues while new substances,e.g.,thick cyclic aromatic hydrocarbons,polycyclic aromatic hydrocarbons(PAHs)and ninhydrin,were detected within 5 days,yet PAHs were unable to be detected after 7 days and ethyl benzene was the only left one of aromatic hydrocarbons after 9 days.Thus,the list of target compounds allowed inclusion of tritoluene,phenanthrene,fluoranthene and pyrene.Both tritoluene and indene were revealed of their contents not affected with the storage time,whereas polycyclic aromatic hydrocarbons even increased their contents.Conclusions For actual fire investigation and identification of the related material evidence,the alkyd paint thinner should be detected within 5 days,and timely extracted and delivered for examination.
作者
何芬芬
江光鑫
金静
刘玲
林庆文
HE Fenfen;JIANG Guangxin;JIN Jing;LIU Ling;LIN Qingwen(Squad 2 of Graduate Faculty,China People’s Police University,Langfang 065000,Hebei,China;Fujian General Corps of Fire and Rescue,Fuzhou 350000,China;Appraisal Center of Fire Physical Evidence,China People’s Police University,Langfang 065000,Hebei,China)
出处
《刑事技术》
2021年第6期647-651,共5页
Forensic Science and Technology
基金
中国人民警察大学中青年教师科研创新计划(ZQN2019018)。
