Baseley Daniel, Wunderlich Luke, Phillips Grady, Gross Kevin, Perram Glen, Willison Stuart, Phillips Rebecca, Magnuson Matthew, Lee Sang Don, Harper Willie F
Air Force Institute of Technology, Department of Systems Engineering and Management, 2950 Hobson Way, Wright-Patterson AFB, OH, US, 45433.
Wright State University, Department of Biomedical Engineering, Dayton, OH 45435.
Build Environ. 2016;108:135-142. doi: 10.1016/j.buildenv.2016.08.028.
Detecting organophosphates in indoor settings can greatly benefit from more efficient and faster methods of surveying large surface areas than conventional approaches, which sample small surface areas followed by extraction and analysis. This study examined a standoff detection technique utilizing hyperspectral imaging for analysis of building materials in near-real time. In this proof-of-concept study, dimethyl methylphosphonate (DMMP) was applied to stainless steel and laminate coupons and spectra were collected during active illumination. Absorbance bands at approximately 1275 cm and 1050 cm were associated with phosphorus-oxygen double bond (P=O) and phosphorus-oxygen-carbon (P-O-C) bond stretches of DMMP, respectively. The magnitude of these bands increased linearly (r = 0.93) with DMMP across the full absorbance spectrum, between ν = 877 cm to ν = 1262 cm. Comparisons between bare and contaminated surfaces on stainless steel using the spectral contrast angle technique indicated that the bare samples showed no sign of contamination, with large uniformly distributed contrast angles of 45°-55°, while the contaminated samples had smaller spectral contact angles of < 20° in the contaminated region and > 40° in the uncontaminated region. The laminate contaminated region exhibited contact angles of < 25°. To the best of our knowledge, this is the first report to demonstrate that hyperspectral imaging can be used to detect DMMP on building materials, with detection levels similar to concentrations expected for some organophosphate deposition scenarios.
与传统方法相比，在室内环境中检测有机磷酸盐可以从更高效、更快的大面积检测方法中大大受益，传统方法是对小面积表面进行采样，然后进行提取和分析。本研究考察了一种利用高光谱成像进行近实时建筑材料分析的远距离检测技术。在这项概念验证研究中，将甲基膦酸二甲酯（DMMP）应用于不锈钢和层压板试样，并在主动照明期间收集光谱。在大约1275厘米和1050厘米处的吸收带分别与DMMP的磷氧双键（P=O）和磷氧碳（P-O-C）键伸缩有关。在整个吸收光谱范围内，从ν = 877厘米到ν = 1262厘米，这些吸收带的强度随DMMP呈线性增加（r = 0.93）。使用光谱对比角技术对不锈钢上的裸露表面和受污染表面进行比较表明，裸露样品没有污染迹象，具有45°-55°的大的均匀分布对比角，而受污染样品在污染区域的光谱接触角小于20°，在未污染区域大于40°。层压板污染区域的接触角小于25°。据我们所知，这是第一份证明高光谱成像可用于检测建筑材料上的DMMP的报告，检测水平与某些有机磷酸盐沉积场景预期的浓度相似。
