INRAE, Univ Montellier, LBE, 102 Av des Etangs, Narbonne F-11100, France; INRAE, UMR ITAP, Montpellier University, Montpellier, France; BIOENTECH Company, F-11100 Narbonne, France; ChemHouse Research Group, Montpellier, France.
BIOENTECH Company, F-11100 Narbonne, France.
Waste Manag. 2021 Mar 1;122:36-48. doi: 10.1016/j.wasman.2020.12.019. Epub 2021 Jan 19.
In the context of organic waste management, near infrared spectroscopy (NIRS) is being used to offer a fast, non-destructive, and cost-effective characterization system. However, cumbersome freeze-drying steps of the samples are required to avoid water's interference on near infrared spectra. In order to better understand these effects, spectral variations induced by dry matter content variations were obtained for a wide variety of organic substrates. This was made possible by the development of a customized near infrared acquisition system with dynamic highly-resolved simultaneous scanning of near infrared spectra and estimation of dry matter content during a drying process at ambient temperature. Using principal components analysis, the complex water effects on near infrared spectra are detailed. Water effects are shown to be a combination of both physical and chemical effects, and depend on both the characteristics of the samples (biochemical type and physical structure) and the moisture content level. This results in a non-linear relationship between the measured signal and the analytical characteristic of interest. A typology of substrates with respect to these water effects is provided and could further be efficiently used as a basis for the development of local quantitative calibration models and correction methods accounting for these water effects.
在有机废物管理方面，近红外光谱（NIRS）正被用于提供一种快速、无损和具有成本效益的特性描述系统。然而，为了避免水对近红外光谱的干扰，需要对样品进行繁琐的冷冻干燥步骤。为了更好地理解这些影响，针对各种有机基质，通过开发一种定制的近红外采集系统，实现了对干物质含量变化引起的光谱变化的研究。该系统具有动态高分辨率的近红外光谱同步扫描功能，并能在环境温度下的干燥过程中估计干物质含量。通过主成分分析，详细描述了水对近红外光谱的复杂影响。结果表明，水的影响是物理和化学效应的结合，并且取决于样品的特性（生化类型和物理结构）和水分含量水平。这导致了测量信号与分析特性之间的非线性关系。根据这些水的影响，提供了一种基质分类法，可进一步有效地用作开发局部定量校准模型和校正方法的基础，以考虑这些水的影响。
