Stach Robert, Pejcic Bobby, Crooke Emma, Myers Matthew, Mizaikoff Boris
CSIRO, Energy , 26 Dick Perry Ave, Kensington, WA 6151, Australia.
Institute of Analytical and Bioanalytical Chemistry, University of Ulm , Albert-Einstein-Allee 11, 89081 Ulm, Germany.
Anal Chem. 2015 Dec 15;87(24):12306-12. doi: 10.1021/acs.analchem.5b03624. Epub 2015 Dec 2.
The use of mid-infrared sensors based on conventional spectroscopic equipment for oil spill monitoring and fingerprinting in aqueous systems has to date been mainly confined to laboratory environments. This paper presents a portable-based mid-infrared attenuated total reflectance (MIR-ATR) sensor system that was used to quantify a number of environmentally relevant hydrocarbon contaminants in marine water. The sensor comprises a polymer-coated diamond waveguide in combination with a room-temperature operated pyroelectric detector, and the analytical performance was optimized by evaluating the influence of polymer composition, polymer film thickness, and solution flow rate on the sensor response. Uncertainties regarding the analytical performance and instrument specifications for dissolved oil detection were investigated using real-world seawater matrices. The reliability of the sensor was tested by exposition to known volumes of different oils; crude oil and diesel samples were equilibrated with seawater and then analyzed using the developed MIR-ATR sensor system. For validation, gas chromatographic measurements were performed revealing that the MIR-ATR sensor is a promising on-site monitoring tool for determining the concentration of a range of dissolved oil components in seawater at ppb to ppm levels.
迄今为止，基于传统光谱设备的中红外传感器在水体系溢油监测和指纹识别方面的应用主要局限于实验室环境。本文介绍了一种基于便携式的中红外衰减全反射（MIR-ATR）传感器系统，该系统用于定量分析海水中多种与环境相关的碳氢化合物污染物。该传感器包括一个聚合物涂层的金刚石波导，与一个室温操作的热释电探测器相结合，并通过评估聚合物组成、聚合物膜厚度和溶液流速对传感器响应的影响来优化分析性能。使用实际海水基质研究了溶解油检测的分析性能和仪器规格的不确定性。通过暴露于已知体积的不同油品来测试传感器的可靠性；原油和柴油样品与海水平衡，然后使用开发的MIR-ATR传感器系统进行分析。为进行验证，进行了气相色谱测量，结果表明MIR-ATR传感器是一种很有前景的现场监测工具，可用于测定海水中浓度范围为ppb至ppm水平的一系列溶解油成分。
