Identification of black microplastics using long-wavelength infrared hyperspectral imaging with imaging-type two-dimensional Fourier spectroscopy,Analytical Methods

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Identification of black microplastics using long-wavelength infrared hyperspectral imaging with imaging-type two-dimensional Fourier spectroscopy
Analytical Methods ( IF 2.7 ) Pub Date : 2021-1-15 , DOI: 10.1039/d0ay01738h
Kosuke Nogo _{1,

2,

3,

4} , Kou Ikejima _{4,

5,

6,

7} , Wei Qi _{1,

2,

3,

4} , Natsumi Kawashima _{1,

2,

3,

4} , Tomoya Kitazaki _{1,

2,

3,

4} , Satoru Adachi _{1,

2,

3,

4} , Kenji Wada _{2,

4,

8,

9} , Akira Nishiyama _{2,

4,

8,

9} , Ichiro Ishimaru _{1,

2,

3,

4}

Affiliation

Despite recent progress in focal plane array Fourier transform infrared spectroscopy (FPA-FT-IR) for automatic microplastic (MP) discrimination, the analysis time is still too long (e.g., 9 h for a sample with a diameter of 47 mm) and the equipment is expensive. As a solution, a hyperspectral camera restricted to the near-infrared or short-wavelength infrared band could be applied. However, with these bands, the minimum discriminable size is only about 100 μm, and discrimination among darkly colored plastics is difficult. The long-wavelength infrared (LWIR) band is reportedly effective for discrimination among darkly colored plastics. In this study, we constructed a palm-sized LWIR hyperspectral camera (105 mm × 90 mm × 50 mm, 1.25 kg) for imaging-type two-dimensional Fourier spectroscopy. Our system used a general-purpose, inexpensive, and compact microbolometer for the LWIR band. This system could record the absorbance of black MPs (polystyrene, polyethylene, and polypropylene) in a 3.8 mm × 3.0 mm area in 36 s, which was less than 1/6th of the time required for FPA-FT-IR. Additionally, our system could obtain spectra for a 12 μm × 12 μm area. Because our device is cheaper and more compact than a FPA-FT-IR, it will be easier to take out in the field or on a research vessel.

中文翻译：

使用成像型二维傅里叶光谱技术的长波红外高光谱成像鉴定黑色微塑料

尽管在焦平面阵列傅立叶变换红外光谱（FPA-FT-IR）领域取得了新进展，可自动识别微塑料（MP），但分析时间仍然太长（例如，直径47毫米的样品需要9个小时），而且设备昂贵。作为解决方案，可以应用限于近红外或短波长红外波段的高光谱相机。然而，对于这些带，最小可辨别尺寸仅为约100μm，并且难以区分深色塑料。据报道，长波红外（LWIR）波段可有效区分深色塑料。在这项研究中，我们构造了一个手掌大小的LWIR高光谱相机（105毫米×90毫米×50毫米，1.25千克），用于成像型二维傅里叶光谱。我们的系统对LWIR波段使用了通用，便宜且紧凑的测微辐射热计。该系统可以在36 s内记录3.8 mm×3.0 mm范围内黑色MP（聚苯乙烯，聚乙烯和聚丙烯）的吸光度，不到FPA-FT-IR所需时间的1/6。此外，我们的系统可以获得12μm×12μm区域的光谱。因为我们的设备比FPA-FT-IR便宜且紧凑，所以在现场或在研究船上更容易取出。

更新日期：2021-01-18

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