Characterization of microplastics in sediment using stereomicroscopy and laser direct infrared (LDIR) spectroscopy

Cheng, Yiling J.; Zhang, Ruijie; Tisinger, Louis G.; Cali, Salvatore; Yu, Zhou; Chen, Hua Yun; Liu, An

doi:10.1016/j.gr.2021.10.002

Cited by 47 publications

(21 citation statements)

References 51 publications

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“…It should be noted that our results do not bear close comparison to other studies due to different sample collection procedures or methodological variations, as well as to the different digestion protocols, all of which can affect particle detections. 77 However, the Manta net MP concentrations are consistent with those previously reported in the same geographical area 78,79 (max. 578 000 MP km −2 ; av.…”

Section: Environmental Science and Technologysupporting

confidence: 90%

“…The concentrations of MPs measured in the surface seawater samples averaged 805 417 ± 381 881 MPs km –2 and 4 ± 2 MPs g –1 WW in mussels Mytilus galloprovincialis , 9 ± 1 MPs g –1 WW in the fish stomach samples, and 2 531 ± 1 565 MPs kg –1 WW of MPs in marine sediments (Table ). It should be noted that our results do not bear close comparison to other studies due to different sample collection procedures or methodological variations, as well as to the different digestion protocols, all of which can affect particle detections . However, the Manta net MP concentrations are consistent with those previously reported in the same geographical area , (max.…”

Section: Resultscontrasting

confidence: 48%

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Identification and Quantification of Microplastics in the Marine Environment Using the Laser Direct Infrared (LDIR) Technique

Ourgaud

Phuong

Papillon

et al. 2022

Environ. Sci. Technol.

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Here, we evaluate for the first time the performances of the newly developed laser direct infrared (LDIR) technique and propose an optimization of the initial protocol for marine microplastics (MPs) analysis. Our results show that an 8 μm porosity polycarbonate filter placed on a Kevley slide enables preconcentration and efficient quantification of MPs, as well as polymer and size determination of reference plastic pellets of polypropylene (PP), polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC), and polyethylene terephthalate (PET), with recoveries ranging from 80–100% and negligible blank values for particle sizes ranging from 200 to 500 μm. A spiked experiment using seawater, sediment, mussels, and fish stomach samples showed that the method responded linearly with significant slopes (R 2 ranging from 0.93–1.0; p < 0.001, p < 0.01). Overall, 11 polymer types were identified with limited handling and an analysis time of ca. 3 h for most samples and 6 h for complex samples. Application of this technique to Mediterranean marine samples (seawater, sediment, fish stomachs and mussels) indicated MP concentrations and size distribution consistent with the literature. A high predominance of PVC (sediment, fish stomachs) and PE and PP (seawater, mussels) was observed in the analyzed samples.

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Section: Environmental Science and Technologysupporting

confidence: 90%

Section: Resultscontrasting

confidence: 48%

Identification and Quantification of Microplastics in the Marine Environment Using the Laser Direct Infrared (LDIR) Technique

Ourgaud

Phuong

Papillon

et al. 2022

Environ. Sci. Technol.

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“…In contrast to small-scale (< 63 µm) MPs that cannot be identi ed via the single Fourier transform infrared spectroscopy (FTIR) test method 1,29 , we applied our patented method, which combines the test methods of visual observation, FTIR, and laser direct infrared imaging (LDIR). Fine-scale MPs (20-50 µm) could be identi ed via the LDIR method after several otation and dissolution cycles 52 . Furthermore, we detected a total of 17 categories of MPs, which is far more than that detected in previous work 1,23,29,46 .…”

Section: Discussionmentioning

confidence: 99%

Tracing the century-long evolution of microplastics deposited in cold seep

Feng

Tang

et al. 2022

Preprint

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Microplastic (MP) pollution is one of the greatest threats to marine ecosystems. The deep sea is regarded as a hotspot for MP accumulation, but how do deposited MPs evolve from a long-term perspective? In particular, the occurrence features of MPs in cold seeps, which are characterized by methane-rich fluid seepage fueling one of the richest ecosystems on the seafloor, are unclear. Here, we demonstrated how MPs have been deposited in the Haima cold seep since the invention of plastics. We found that the burial rate of MPs exponentially increased since the massive global use of plastics in the 1930s, and this cold seep accommodates more MPs than do coastal areas. Upwelling fluid seepage facilitated the fragmentation and degradation behaviors of MPs. More MP-degrading microorganism populations and functional genes were discovered in methane seepage areas. Our findings illuminated the need to determine fundamental strategies for sustainable marine plastic pollution mitigation in the natural deep-sea environment.

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“…For example, crystalline polymorphs can be identified rapidly in solid formulations. Moreover, its application for the analysis of microplastic components has also been reported 31 . The μ‐FT‐IR method is suitable for carefully analyzing the components of each sample, whereas the LDIR method is advantageous for component and shape analyses, simultaneously, through surface scanning without classifying the sample.…”

Section: Methodsmentioning

confidence: 99%

Microplastics/microfibers in settled indoor house dust—exploratory case study for 10 residential houses in the Kanto area of Japan

Eunsu

Tanaka²,

Yuan

et al. 2022

Japan Architectural Review

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Although microplastic (size ≤5 mm) pollution in marine ecosystems has received global attention, the presence of microplastics and microfibers in indoor environments is also a major concern. Compared to the available field survey data on microplastics in the ocean, such information remains limited for indoor environments. Microplastics in indoor environments may act as adsorbents for chemical compounds, which may result in multiple adverse health effects on residents. Establishment of reproducible sampling and analysis methods aiding comprehensive field measurements of indoor microplastics in Japan is required. This study conducted the first field survey of indoor microplastics in settled dust in 10 residential houses in the Kanto area of Japan and explored their composition and morphology. Micro‐Fourier transform infrared (μ‐FT‐IR) spectrophotometry and laser direct infrared (LDIR) analysis were used for the qualitative analysis of microplastics. The μ‐FT‐IR and LDIR analyses revealed the presence of large quantities of microplastics in the settled dust. The samples were composed of cellulose, polyethylene terephthalate, polyethylene, alkyd resins, polysulfone, polyvinyl alcohol, and polyamides. The μ‐FT‐IR and LDIR analyses were suitable for identifying large fibrous materials and small particles, respectively. Thus, the two methods are complementary for the comprehensive identification of microplastic composition in settled dust.

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Characterization of microplastics in sediment using stereomicroscopy and laser direct infrared (LDIR) spectroscopy

Cited by 47 publications

References 51 publications

Identification and Quantification of Microplastics in the Marine Environment Using the Laser Direct Infrared (LDIR) Technique

Identification and Quantification of Microplastics in the Marine Environment Using the Laser Direct Infrared (LDIR) Technique

Tracing the century-long evolution of microplastics deposited in cold seep

Microplastics/microfibers in settled indoor house dust—exploratory case study for 10 residential houses in the Kanto area of Japan

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