Spatial distribution of microplastics in the tropical Indian Ocean based on laser direct infrared imaging and microwave-assisted matrix digestion

Hildebrandt, Lars; Gareb, Fadi El; Zimmermann, Tristan; Klein, Ole; Kerstan, Andreas; Emeis, Kay-Christian; Pröfrock, Daniel

doi:10.1016/j.envpol.2022.119547

Cited by 30 publications

(16 citation statements)

References 71 publications

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“…Values ranged from 0 to 1, where larger values indicate a higher probability of specific microplastics. In this study, we included microplastics with a matching degree of ≥0.70 according to several previous LDIR studies. − Alternatively, because of the subtle difference in the infrared radiation absorption spectrum between polyamides and natural proteins, polyamide was classified as a nonmicroplastic herein.…”

Section: Methodsmentioning

confidence: 99%

New Evidence of Microplastics in the Lower Respiratory Tract: Inhalation through Smoking

Li²,

Wang

et al. 2023

Environ. Sci. Technol.

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To investigate the relation of smoking and microplastic inhalation, we conducted a prospective study combining population-based and experimental work. Bronchoalveolar lavage fluid (BALF) samples from 17 smokers and 15 nonsmokers were collected in Zhuhai City, China. We simulated an active smoking model to explore the contribution of smoking to inhaled microplastics. The characteristics of microplastics in BALF samples and cigarette smoke were determined using laser direct infrared spectroscopy. We compared the differences between smokers and nonsmokers as well as between cigarette smoke and control groups. Microplastics were identified positive in all BALF samples. Smokers had higher concentrations of total microplastics (25.86 particles/ g), polyurethane (11.34 particles/g), and silicone (1.15 particles/ g) than nonsmokers. In the cigarette smoking simulation model, higher concentrations of total microplastics (9.99 particles/L), polyurethane (4.66 particles/L), and silicone (2.78 particles/L) were present in the cigarette smoke than those in the control group. We confirmed and extended the evidence on the presence of microplastics in the lower respiratory tract. These findings also provide new evidence on the relation between cigarette smoking and microplastic inhalation.

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Section: Methodsmentioning

confidence: 99%

New Evidence of Microplastics in the Lower Respiratory Tract: Inhalation through Smoking

Li²,

Wang

et al. 2023

Environ. Sci. Technol.

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“…Irregularly shaped high-density polyethylene (HDPE; 20-63 µm) and PET (20-63 µm) fragments (both Goodfellow GmbH, Hamburg, Germany), which were applied as in-house QC standards in recent studies [13][14][15], and polystyrene (PS) microspheres d certified = 9.93 µm, ρ = 1.05 g mL −1 ) (Sigma-Aldrich, St. Louis, MO, USA) were used for the experiments. Physical properties, sieving and chemical characterization (elemental analysis via inductively coupled plasma mass spectrometry (ICP-MS), static light scattering analysis, visual, confocal and scanning electron microscopy (SEM), attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR), and laser direct infrared (LDIR) analysis of the PE and PET particles are described in previous publications [14,16].…”

Section: Model Microplasticsmentioning

confidence: 99%

“…Highly concentrated stock suspensions (1% (m/m) (PE and PET) and 10% (PS) (m/m)) were subjected to serial dilution to achieve single microplastic suspensions containing between ~ 1300 (PE) and ~ 22000 (PS) particles mL −1 . The concentrations were estimated by automated LDIR imaging [13,17].…”

Section: Model Microplasticsmentioning

confidence: 99%

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Laser microdissection pressure catapulting (LMPC): a new technique to handle single microplastic particles for number-based validation strategies

2023

Self Cite

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This study examines laser microdissection pressure catapulting (LMPC) as an innovative method for microplastic research. Laser pressure catapulting as part of commercially available LMPC microscopes enables the precise handling of microplastic particles without any mechanical contact. In fact, individual particles with sizes between several micrometers and several hundred micrometers can be transported over centimeter-wide distances into a collection vial. Therefore, the technology enables the exact handling of defined numbers of small microplastics (or even individual ones) with the greatest precision. Herewith, it allows the production of particle number-based spike suspensions for method validation. Proof-of-principle LMPC experiments with polyethylene and polyethylene terephthalate model particles in the size range from 20 to 63 µm and polystyrene microspheres (10 µm diameter) demonstrated precise particle handling without fragmentation. Furthermore, the ablated particles showed no evidence of chemical alteration as seen in the particles’ IR spectra acquired via laser direct infrared analysis. We propose LMPC as a promising new tool to produce future microplastic reference materials such as particle-number spiked suspensions, since LMPC circumvents the uncertainties resulting from the potentially heterogeneous behavior or inappropriate sampling from microplastic suspensions. Furthermore, LMPC could be advantageous for the generation of very accurate calibration series of spherical particles for microplastic analysis via pyrolysis–gas chromatography–mass spectrometry (down to 0.54 ng), as it omits the dissolution of bulk polymers. Graphical Abstract

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“…This means a prevailing westward transport by relatively fresh surface waters. Nevertheless, it has been found that MP abundances and variability of MP types along E-W transects in the Indian Ocean do not point exclusively to an MP origin from large river sources and the advection with low-salinity surface water of the Indonesian throughflow [84]. Rather the findings often suggest a regional or even local origin [84].…”

Section: Introductionmentioning

confidence: 99%

Microplastic in the Marine Environment of the Indian Ocean

Thiemann¹

2023

JEP

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Microplastic has been found in all major waterbodies in the world. Many examples of ingestion of microplastic by marine organisms have been reported. This presence of microplastic in marine organisms gives it the possibility to penetrate the human food chain by increasing the chance of microplastic in seafood targeted for human consumption. Although it is known that parts of the Indian Ocean suffer from significant plastic pollution, much of the systematic research on the microplastic abundance in different regions of the Indian Ocean stems only from the last five years. This manuscript reviews the available literature of 2015-2022 on the presence of microplastics in commercially important fish species in the Indian Ocean. The literature data on microplastic content on beaches, in subtidal sediment, in the sediment from the ocean floor, and in surface water of different regions of the Indian Ocean is reviewed, also.

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Spatial distribution of microplastics in the tropical Indian Ocean based on laser direct infrared imaging and microwave-assisted matrix digestion

Cited by 30 publications

References 71 publications

New Evidence of Microplastics in the Lower Respiratory Tract: Inhalation through Smoking

New Evidence of Microplastics in the Lower Respiratory Tract: Inhalation through Smoking

Laser microdissection pressure catapulting (LMPC): a new technique to handle single microplastic particles for number-based validation strategies

Microplastic in the Marine Environment of the Indian Ocean

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