Bridge Candice M, Powell Joseph, Steele Katie L, Williams Mary, Macinnis Jean M, Sigman Michael E
National Center for Forensic Science and Department of Chemistry, University of Central Florida, P.O. Box 162367, Orlando, Florida 32816, USA.
Appl Spectrosc. 2006 Oct;60(10):1181-7. doi: 10.1366/000370206778664572.
A comparative analysis of the discriminating power of laser-induced breakdown spectroscopy (LIBS) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), each coupled with refractive index (RI) measurements, is presented for a study of 23 samples of automobile float glass. Elemental emission intensity ratios (LIBS) and elemental concentration ratios (LA-ICP-MS) and their associated confidence intervals were calculated for each float glass sample. The ratios and confidence intervals were used to determine the discrimination power of each analytical method. It was possible to discriminate 83% of the glass samples with 99% confidence based on LIBS spectra alone, and 96-99% of the samples could be discriminated based on LIBS spectra taken in conjunction with RI data at the same confidence level. LA-ICP-MS data allowed for 100% discrimination of the samples without the need for RI data. The results provide evidence to support the use of LIBS combined with RI for forensic analysis of float glass in laboratories that do not have access to LA-ICP-MS.
本文对23个汽车浮法玻璃样品进行了研究，比较分析了激光诱导击穿光谱法（LIBS）和激光烧蚀电感耦合等离子体质谱法（LA-ICP-MS）与折射率（RI）测量相结合时的鉴别能力。计算了每个浮法玻璃样品的元素发射强度比（LIBS）、元素浓度比（LA-ICP-MS）及其相关的置信区间。这些比率和置信区间用于确定每种分析方法的鉴别能力。仅基于LIBS光谱，就有可能以99%的置信度鉴别出83%的玻璃样品；在相同置信水平下，结合RI数据的LIBS光谱可鉴别出96%-99%的样品。LA-ICP-MS数据无需RI数据就能100%鉴别出样品。研究结果为在无法使用LA-ICP-MS的实验室中，将LIBS与RI结合用于浮法玻璃的法医分析提供了支持证据。
