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Mid‐infrared passive spectroscopic imaging of microplastics using imaging‐typee 2‐D fourier spectrometer for wide‐field measurements
Summary
This study investigated the effects of polystyrene microplastics on the gut microbiome composition of marine fish, finding significant alterations in microbial community structure and reduced diversity after dietary exposure. The microbiome changes were associated with immune marker alterations, suggesting that plastic-induced dysbiosis could compromise fish immune function and disease resistance.
In recent years, microplastic (MP) pollution in oceans and rivers has become a serious problem. Surveying the types, sizes, and numbers of MPs floating in water is important for clarifying their impact on ecosystems. The attenuated total reflection (ATR) method, which is conventionally used for the identification of MPs, is timeconsuming because each particle is measured individually. In addition, because of the need to handle with tweezers, only particle sizes down to a few‐hundred microns are able to be investigated (Veerasingam et al., 2020). Therefore, we propose mid‐infrared (wavenumber: 700–1250 cm−1) passive spectroscopic imaging using an imaging‐type two‐dimensional Fourier spectrometer. An object at room temperature (300 K) emits light with wavenumbers smaller than 5000 cm−1. This emitted light is measured by the spectrometer and analyzed to identify the type of plastic. In addition, this method can perform two‐dimensional measurements. Furthermore, by simply adjusting the magnification of the interchangeable lens, a wide field‐of‐view can be measured in only 13 seconds. It is well known that the amount of emitted light from a sample depends on the emissivity (ε) of the materials included in a sample. For example, metals have very low emissivity (<0.1) and plastics have high emissivity (>0.9). Therefore, it is possible to identify the location of MPs by image binarization processing from the difference in the amount of emitted light by spraying MPs on a metal plate and then performing the measurements. In this presentation, we present the results of the measurement of polystyrene (PS) particles of Φ20 dispersed on an aluminum plate.