Tenax GR吸附解析技术在火场汽油残留物提取检验中的应用研究

Tenax GR Adsorption and Desorption for Extraction of Residual Gasoline at Fire Site

目的针对火灾现场常规提取检验方法操作复杂、容易导致汽油残留物有效成分丢失等问题,研究建立采用Tenax GR吸附解析技术简便、高效提取检验汽油残留物的方法。方法将Tenax GR吸附管放入相关检材中,密封后在60℃烘箱中加热1h,经热脱附仪解析后使用气质联用仪分析。结果Tenax GR吸附解析技术可以检验汽油残留物中特征组分,主要包括甲苯、二甲基苯、三甲基苯、四甲基苯、萘、甲基萘及茚满类化合物。该技术的检测限为0.25pL/mL,同时放入6根吸附管做稳定性实验,其相对标准偏差(RSD)为2.43%。该技术进行7、15、30、60、90d等不同阶段的保存实验,其相对偏差分别为6.3%、14.4%、8.7%、18.3%、11.6%。结论该技术操作方便、灵敏度高、稳定性好,适用于火灾现场中汽油残留物的提取检验。

Objective Against the problem that effective constituents likely dismiss from the evidential gasoline residue due to the complexity of ordinary extraction and handling at the fire scene,a rapid innovation was to try with Tenax GR adsorption and desorption to make the gasoline residue picked up conveniently and effi ciently.Methods Tenax GR absorption tube was placed into a container inside which the object or material holding gasoline residue had been already put.The container was afterwards sealed to heat within an oven at 60℃for one hour to make the effective constituents from gasoline residue absorbed into the tube.The Tenax GR absorption tube was undergone through thermal desorption to release its holding substances that were successively analyzed with GC/MS.Results Tenax GR adsorption and desorption was revealed able to detect the gasoline residue of its characteristic components:toluene,dimethylbenzene,trimethylbenzene,tetramethylbenzene,naphthalene,methylnaphthalene and indan compounds,showing the detection limit being 0.25pL/mL.Six Ten ax GR adsorption tubes gave the average RSD of 2.43%for stability test.The preservation sustainability manifested the relative deviation was respective of 6.3%,14.4%,8.7%,18.3%and 11.6%from the corresponding deposition of well-absorbed Tenax GR tubes for 7,15,30,60 and 90 days.Conclusion The innovation is easy to operate,high sensitive,relatively stable,suitable for the extraction and examination of gasoline residues at fi re scene.