Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Konan 4-5-7, Minato-Ku, Tokyo 108-8477, Japan.
Department of Ocean Sciences, Tokyo University of Marine Science and Technology, Konan 4-5-7, Minato-Ku, Tokyo 108-8477, Japan.
Mar Pollut Bull. 2023 Sep;194(Pt A):115362. doi: 10.1016/j.marpolbul.2023.115362. Epub 2023 Aug 5.
This study investigates the feasibility of using the carbonyl index (CI) derived from Raman spectra as an indicator of plastic degradation and its relationship with the CI calculated from Fourier transform infrared (FTIR) spectra, using microplastic samples of polyethylene (PE) from surface seawater. Multiple methods were used to calculate the CI values of FTIR spectra, while proposed methods were used to calculate the corresponding CI values of Raman spectra. Some significant relations between FTIR CI and Raman CI were observed. However, small R values suggest weak functional relationships, which can be attributed to the low signal-to-noise ratio (SNR) of Raman spectra. These results highlight the challenges of establishing a functional relationship between FTIR CI and Raman CI, including challenges such as the uniformity of Raman spectra, determining optimal Raman measurement parameters, selecting appropriate peaks for Raman CI calculation, deciding on spectral processing methods, and addressing the interdependence of these issues.
本研究以海面采集的聚乙烯（PE）微塑料为对象，探讨了基于拉曼光谱的羰基指数（CI）作为塑料降解指标的可行性，及其与傅里叶变换红外（FTIR）光谱 CI 的关系。文中使用了多种方法计算 FTIR 光谱的 CI 值，同时还提出了用于计算相应拉曼光谱 CI 值的方法。结果发现 FTIR CI 与 Raman CI 之间存在一定的相关性，但 R 值较小表明它们之间的功能关系较弱，这可能是由于拉曼光谱的信噪比（SNR）较低所致。这些结果突显了在 FTIR CI 与 Raman CI 之间建立功能关系所面临的挑战，包括 Raman 光谱的均匀性、确定最佳 Raman 测量参数、选择用于 Raman CI 计算的合适峰、选择光谱处理方法以及解决这些问题的相互依赖性等方面的挑战。
