Mehltretter Andria H, Bradley Maureen J, Wright Diana M
Laboratory Division, Federal Bureau of Investigation, 2501 Investigation Parkway, Quantico, VA 22135, USA.
J Forensic Sci. 2011 Nov;56(6):1493-504. doi: 10.1111/j.1556-4029.2011.01873.x. Epub 2011 Sep 2.
The backings of 90 black electrical tapes were analyzed to evaluate the chemical components of these films, the ability of individual techniques to discriminate samples, and the ability of the techniques combined to distinguish samples. The techniques utilized and their respective discrimination results were stereomicroscopy and physical measurements, to include observation of surface features of the backing, width, and thickness measurements (c. 64%); Fourier transform infrared spectroscopy (FTIR) using a microscope accessory (c. 83%); pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS; c. 81%); and scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS; c. 87%). Ninety-four percent of the backings were discriminated through this combination of analytical methods. Finally, evaluating these results in conjunction with previously published data on the analysis of the adhesives from the same set of electrical tapes provided an overall discrimination of nearly 96%.
对90条黑色电工胶带的背衬进行了分析，以评估这些薄膜的化学成分、各个技术鉴别样本的能力以及这些技术联合起来区分样本的能力。所采用的技术及其各自的鉴别结果如下：立体显微镜检查和物理测量，包括观察背衬的表面特征、宽度和厚度测量（约64%）；使用显微镜附件的傅里叶变换红外光谱法（FTIR，约83%）；热解气相色谱/质谱联用（Py-GC/MS，约81%）；以及扫描电子显微镜/能谱分析（SEM/EDS，约87%）。通过这种分析方法的组合，94%的背衬得以鉴别。最后，结合此前发表的关于同一组电工胶带粘合剂分析的数据来评估这些结果，总体鉴别率接近96%。
